Add route interactions: click-to-split, drag-to-reshape, colored route rendering

- Enrich BRouter response with per-point 3D coordinates and segment boundary
  tracking (EnrichedRoute interface)
- ColoredRoute component: plain, elevation gradient (green→yellow→red), and
  surface color modes with invisible wide polyline for click targeting
- Click-to-split: click on route polyline inserts waypoint at nearest point,
  mapped to correct segment via boundary indices
- MidpointHandles: draggable CircleMarkers at route segment midpoints for
  reshaping, hidden below zoom 12, opaque on hover
- Color mode toggle (select) synced via Yjs routeData
- i18n keys for color mode labels (en + de)
- Unit tests for segment boundary tracking (13 tests)
- E2E tests for enriched route response and color mode toggle

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Ullrich Schäfer 2026-03-26 08:21:24 +01:00
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schema: spec-driven
created: 2026-03-25

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## Context
The Planner architecture defines noGoAreas, notes, and crash recovery in the
Yjs data model but none are implemented. The public instance also lacks rate
limiting — anyone can create unlimited sessions or hammer BRouter.
## Goals / Non-Goals
**Goals:**
- Draw no-go polygons on the map, synced via Yjs, sent to BRouter
- Shared notes (Y.Text) visible in sidebar for planning discussion
- localStorage backup of Yjs state, merged on reconnect
- Rate limits: 10 sessions/IP/hour, 60 BRouter calls/session/hour
**Non-Goals:**
- Complex polygon editing (holes, multi-polygon) — just simple polygons
- Rich text in notes (just plain text)
- Cross-tab Yjs sync via localStorage (handled by WebSocket)
- Rate limiting dashboard or admin UI
## Decisions
### D1: No-go areas as Yjs Y.Array of polygon coordinates
```typescript
// Yjs doc structure addition
noGoAreas: Y.Array<Y.Map<{
points: Array<{lat: number, lon: number}>,
name?: string
}>>
```
Each polygon is a closed ring of lat/lon points. BRouter accepts no-go areas
as a `nogo` parameter: `lon,lat,radius` for circles or polygon coordinates
depending on the BRouter version. We'll convert our polygons to BRouter's
expected format in the routing request.
### D2: Leaflet.draw for polygon drawing
Use `leaflet-draw` (or `@geoman-io/leaflet-geoman-free`) for drawing polygons
on the map. When a polygon is completed, add it to the Y.Array. Existing
polygons render as semi-transparent red overlays.
### D3: Notes as Y.Text in sidebar tab
Add a "Notes" tab to the sidebar (alongside waypoints). Uses Y.Text for
collaborative editing — simple textarea bound to Y.Text. Changes sync in
real-time. No markdown rendering — plain text only.
### D4: localStorage crash recovery
Every 10 seconds, save `Y.encodeStateAsUpdate(doc)` to
`localStorage['trails:session:${id}']`. On page load, if localStorage has
state for the current session, apply it as an update before connecting to
the server. Yjs CRDTs merge automatically — no conflicts.
Clear localStorage entry when session is closed or after successful sync.
### D5: In-memory rate limiter
Simple Map-based rate limiter in `server.ts`:
- Session creation: Track IP → count + window. Reject with 429 after 10/hour.
- BRouter proxy: Track session ID → count + window. Reject after 60/hour.
- No Redis needed — single server, in-memory is fine. Resets on restart
(acceptable).
## Risks / Trade-offs
- **leaflet-draw adds bundle size** → ~50KB gzipped. Acceptable for polygon
drawing functionality. Can lazy-load.
- **localStorage size limit** → ~5MB per origin. Yjs state is typically
10-100KB. No risk.
- **In-memory rate limiter resets on deploy** → Acceptable for current scale.
Redis-backed when needed.

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## Why
The Planner's core editing works but is missing features from the architecture
doc: no-go areas for route avoidance, session notes for collaborative planning
communication, localStorage crash recovery for unsaved work, and rate limiting
to protect the BRouter API from abuse on the public instance.
## What Changes
- **No-go areas**: Draw polygons on the map that BRouter avoids when computing
routes. Stored as Y.Array in the Yjs doc, synced across participants.
- **Session notes**: Shared text area (Y.Text) for participants to leave notes,
discuss the route, or plan logistics. Visible in the sidebar.
- **Crash recovery**: Periodically save Yjs state to localStorage. On
reconnect, merge local state with server state to recover unsaved changes.
- **Rate limiting**: Limit session creation per IP and BRouter API calls per
session to prevent abuse on the public instance.
## Capabilities
### New Capabilities
- `no-go-areas`: Draw avoidance polygons on the Planner map, passed to BRouter as routing constraints
- `session-notes`: Shared collaborative text in Planner sessions via Yjs Y.Text
- `crash-recovery`: localStorage backup of Yjs state for reconnection after browser crash
- `rate-limiting`: IP-based limits on session creation and route computation
### Modified Capabilities
- `planner-session`: Session data model gains noGoAreas and notes fields
- `brouter-integration`: Routing requests include no-go area polygons
- `map-display`: Map gains polygon drawing tools for no-go areas
## Impact
- **Planner Yjs doc**: New fields (noGoAreas: Y.Array, notes: Y.Text)
- **BRouter API**: No-go areas passed as `nogo` parameter
- **Map**: Leaflet.draw or custom polygon tool for no-go areas
- **Dependencies**: May need `leaflet-draw` for polygon editing
- **Server**: Rate limiting middleware (in-memory store)

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## MODIFIED Requirements
### Requirement: BRouter routing with constraints
Route computation SHALL include no-go area polygons as avoidance constraints.
#### Scenario: Route with no-go areas
- **WHEN** the routing host computes a route and no-go areas exist
- **THEN** the BRouter request includes nogo parameters for each polygon

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## ADDED Requirements
### Requirement: localStorage crash recovery
The Planner SHALL periodically save Yjs state to localStorage and recover it on reconnect.
#### Scenario: Browser crash recovery
- **WHEN** a user's browser crashes and they reopen the session
- **THEN** unsaved changes from localStorage are merged with the server state
#### Scenario: Clean exit
- **WHEN** a session syncs successfully
- **THEN** the localStorage backup is cleared

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## MODIFIED Requirements
### Requirement: Map polygon drawing
The Planner map SHALL support drawing and displaying no-go area polygons.
#### Scenario: Polygon tool
- **WHEN** a user activates the no-go area tool
- **THEN** they can draw a polygon by clicking points on the map
#### Scenario: Polygon display
- **WHEN** no-go areas exist in the session
- **THEN** they are rendered as semi-transparent red polygons on the map

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## ADDED Requirements
### Requirement: Draw no-go areas
Users SHALL be able to draw polygons on the map that BRouter avoids when computing routes.
#### Scenario: Draw polygon
- **WHEN** a user activates the no-go area tool and draws a polygon on the map
- **THEN** the polygon is added to the Yjs doc and visible to all participants
#### Scenario: Route avoids no-go area
- **WHEN** a route is computed and a no-go area intersects the direct path
- **THEN** BRouter routes around the no-go area
#### Scenario: Delete no-go area
- **WHEN** a user deletes a no-go area polygon
- **THEN** it is removed from the Yjs doc and the route is recomputed

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## MODIFIED Requirements
### Requirement: Planner session data model
The Yjs document SHALL include noGoAreas and notes fields alongside waypoints and routeData.
#### Scenario: Session with all fields
- **WHEN** a Planner session is active
- **THEN** the Yjs doc contains: waypoints (Y.Array), routeData (Y.Map), noGoAreas (Y.Array), notes (Y.Text)

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## ADDED Requirements
### Requirement: Session creation rate limit
The Planner SHALL limit session creation to 10 per IP per hour.
#### Scenario: Rate limit exceeded
- **WHEN** an IP creates more than 10 sessions in one hour
- **THEN** the server responds with 429 Too Many Requests
### Requirement: BRouter call rate limit
The Planner SHALL limit route computations to 60 per session per hour.
#### Scenario: Routing rate limit exceeded
- **WHEN** a session exceeds 60 BRouter calls in one hour
- **THEN** the server responds with 429 and the client shows a "slow down" message

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## ADDED Requirements
### Requirement: Collaborative session notes
Planner sessions SHALL have a shared text area for participants to write notes.
#### Scenario: Write notes
- **WHEN** a user types in the notes area
- **THEN** the text syncs in real-time to all other participants via Yjs
#### Scenario: Notes persist
- **WHEN** a user leaves and rejoins a session
- **THEN** the notes are still there (stored in Yjs doc)

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## 1. No-Go Areas
- [x] 1.1 Add `noGoAreas` Y.Array to Yjs doc in use-yjs.ts
- [x] 1.2 Add leaflet-draw (or geoman) dependency for polygon drawing
- [x] 1.3 Create NoGoAreaLayer component — renders polygons as red overlays, handles draw/delete
- [x] 1.4 Add no-go area toolbar button to PlannerMap
- [x] 1.5 Pass no-go areas to BRouter API as `nogo` parameters in brouter.ts
- [x] 1.6 Trigger route recomputation when no-go areas change
## 2. Session Notes
- [x] 2.1 Add `notes` Y.Text to Yjs doc in use-yjs.ts
- [x] 2.2 Create NotesPanel component — textarea bound to Y.Text with real-time sync
- [x] 2.3 Add "Notes" tab to sidebar (alongside waypoints)
- [x] 2.4 Add i18n keys for notes UI (en + de)
## 3. Crash Recovery
- [x] 3.1 Add periodic localStorage save (every 10s) of Yjs state in use-yjs.ts
- [x] 3.2 On session reconnect, check localStorage for saved state and apply as Yjs update
- [x] 3.3 Clear localStorage entry after successful sync or session close
- [x] 3.4 Write unit test for save/restore logic
## 4. Rate Limiting
- [x] 4.1 Create rate limiter utility in apps/planner/app/lib/rate-limit.ts (already exists — extend for IP tracking)
- [x] 4.2 Add session creation rate limit (10/IP/hour) in the /new route or API
- [x] 4.3 Add BRouter proxy rate limit (60/session/hour) in the route computation handler
- [x] 4.4 Return 429 with Retry-After header and show user-friendly message on client
## 5. Verify
- [x] 5.1 Test no-go areas: draw polygon, verify route avoids it, delete polygon
- [x] 5.2 Test notes: type in two windows, verify real-time sync
- [x] 5.3 Test crash recovery: make changes, kill browser, reopen — verify recovery
- [x] 5.4 Test rate limiting: exceed limits, verify 429 response

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schema: spec-driven
created: 2026-03-26

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## Context
The Planner currently renders routes as a single-color `L.Polyline` with no
interactivity — users can't click on the route or drag it. Waypoints can only
be appended (click on map) or reordered in the sidebar. BRouter returns
per-point elevation in coordinates (`[lon, lat, ele]`) and can return surface
tags, but `mergeGeoJsonSegments` currently discards all per-point data and
only keeps track-level totals.
bikerouter.de and komoot both support click-to-split and drag-to-reshape as
primary editing interactions. These are the most natural way to refine a route
after the initial waypoints are placed.
## Goals / Non-Goals
**Goals:**
- Hover over the route to see a transient ghost marker at the nearest route point
- Click or drag the ghost marker to insert a waypoint (split / reshape)
- Color the route by elevation gradient (green→yellow→red) or surface type
- Sync elevation chart colors with route coloring in elevation mode
- Preserve per-point data from BRouter through the merge pipeline
- All interactions synced via Yjs (collaborative)
**Non-Goals:**
- Undo/redo system (future change)
- Route alternatives (show multiple options)
- Custom color gradient configuration
- Surface type legend or detailed surface info panel
- Offline route coloring (requires BRouter data)
## Decisions
### D1: Ghost marker interaction (inspired by brouter-web)
Following brouter-web's `L.Routing.Edit` pattern: a **single persistent
draggable Marker** (`RouteInteraction` component) that appears when the cursor
is near the route and can be clicked or dragged to insert a waypoint.
Key techniques from brouter-web:
- **Distance-based snap**: Listen on `map.mousemove`, compute pixel distance
to nearest route coordinate (15px tolerance). No reliance on SVG polyline
mouseout events (which cause flickering).
- **Single reusable marker**: Created once via `L.marker({ draggable: true })`,
shown/hidden with `addTo(map)`/`remove()`. Not destroyed/recreated on each
hover.
- **Dragging guard**: `draggingRef` flag freezes snap updates during drag and
prevents hide-on-mouseout.
- **Leaflet's built-in drag**: `draggable: true` on the Marker uses Leaflet's
`L.Draggable` which automatically calls `L.DomUtil.disableTextSelection()`
during drag and re-enables on dragend.
- **Trailer lines**: Two persistent dashed `L.Polyline` instances shown during
drag, connecting the ghost to adjacent waypoints for visual feedback.
**Alternative considered and rejected**: Fixed midpoint CircleMarkers between
waypoints. Caused flickering (render loop between marker and polyline events),
required zoom threshold to avoid clutter, and `CircleMarker` SVG rendering
was unreliable in react-leaflet after programmatic zoom.
**Alternative considered and rejected**: Invisible wide polyline for click
detection. Playwright couldn't trigger mousemove events on SVG paths with
opacity 0. The map-level listener with distance-based snap is more reliable.
### D2: Per-point data preservation in BRouter response
BRouter GeoJSON coordinates are `[lon, lat, ele]`. For surface data, BRouter's
`tiledesc=true` parameter includes per-point `WayTags` in the
`properties.messages` array (e.g., `surface=asphalt highway=primary`).
`mergeGeoJsonSegments` now:
1. Preserves full 3D coordinates `[lon, lat, ele]`
2. Tracks segment boundary indices (where each waypoint segment starts)
3. Extracts surface type per point from `WayTags` via regex
The `EnrichedRoute` interface:
```typescript
interface EnrichedRoute {
coordinates: [number, number, number][]; // [lon, lat, ele]
segmentBoundaries: number[]; // coordinate index where each segment starts
surfaces: string[]; // surface type per point (from WayTags)
totalLength: number;
totalAscend: number;
totalTime: number;
geojson: GeoJsonCollection; // backwards compat
}
```
All enriched data is stored in `routeData` Y.Map (as JSON strings) so all
participants receive it.
### D3: Colored route rendering with segmented polylines
`ColoredRoute` component renders multiple `L.Polyline` segments colored by
per-point data. Three modes toggled via a `<select>` in the session header,
synced via Yjs `routeData.colorMode`:
1. **Plain**: Single-color blue polyline (default)
2. **Elevation**: green→yellow→red gradient normalized to route elevation range
3. **Surface**: Fixed color palette per surface type (asphalt=gray, gravel=brown,
path=green, track=orange, etc.). Falls back to plain if surface data
unavailable.
### D4: Elevation chart color sync
`ElevationChart` reads `colorMode` from Yjs and uses the same `elevationColor()`
function as `ColoredRoute` when in elevation mode. Each chart segment is drawn
with the corresponding elevation color for both the fill and line.
### D5: Map click suppression
When the ghost marker click or drag inserts a waypoint, a `suppressMapClickRef`
flag prevents the subsequent `MapClickHandler` from also appending a waypoint.
This solves the Leaflet event model issue where map click fires independently
from layer click.
## Risks / Trade-offs
- **Performance with many segments** → Hundreds of small `L.Polyline` instances
for colored rendering could be slow. Can switch to canvas if needed later.
- **BRouter surface data availability** → Not all BRouter profiles return
surface tags. Surface coloring falls back to plain when data is missing.
- **Snap precision** → Distance-based snap at 15px works well at typical zoom
levels. On very dense routes, the nearest coordinate might be slightly off
from the visual route line.
- **Playwright E2E limitations** → Ghost marker hover can't be reliably tested
via Playwright's mouse simulation on Leaflet SVG. Verified visually via
cmux browser instead.

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## Why
The Planner's route editing is click-only: users place waypoints and the route
auto-computes between them. But refining a route is tedious — you can't insert
a waypoint on the route itself, drag a route segment to reshape it, or see what
kind of terrain you're heading into. These are table-stakes features in modern
route planners (bikerouter.de, komoot, Ride with GPS) and the most common
feedback from early testers.
## What Changes
- **Route splitting**: Hover near the route to see a ghost marker at the nearest
point. Click it to insert a new waypoint, splitting the segment. The waypoint
snaps to the closest coordinate on the existing route.
- **Drag-to-reshape**: Drag the ghost marker to a new position to reshape the
route. Dashed trailer lines connect to adjacent waypoints during drag.
Inspired by brouter-web's single-persistent-marker pattern.
- **Colored route rendering**: Replace the single-color route polyline with
segments colored by elevation gradient or surface type (from BRouter's
per-point data). Users toggle between plain, elevation, and surface color
modes. Elevation chart syncs with route colors in elevation mode.
## Capabilities
### New Capabilities
- `route-splitting`: Insert waypoints by clicking the ghost marker on the route,
with snapping to the nearest route coordinate
- `route-drag-reshape`: Drag the ghost marker to reshape the route interactively
with trailer lines and text selection prevention
- `route-coloring`: Color-code the route polyline by elevation gradient or
surface type using BRouter tiledesc data, with elevation chart color sync
### Modified Capabilities
- `map-display`: Route visualization changes from a single-color polyline to
a segmented, interactive polyline with color modes and ghost marker interaction
- `brouter-integration`: BRouter requests include `tiledesc=true`; response data
(elevation, surface tags, segment boundaries) preserved in EnrichedRoute
## Impact
- **PlannerMap.tsx**: Route polyline becomes interactive via RouteInteraction
component with ghost marker, map click suppression
- **brouter.ts**: EnrichedRoute with per-point 3D coordinates, segment
boundaries, and surface types extracted from BRouter tiledesc WayTags
- **use-routing.ts**: Stores enriched data (coordinates, boundaries, surfaces)
in Yjs routeData map
- **New components**: RouteInteraction (ghost marker + drag), ColoredRoute
(segmented polyline renderer)
- **ElevationChart**: Uses same `elevationColor()` gradient as route in
elevation mode
- **Dependencies**: No new dependencies (uses Leaflet's built-in L.Draggable)
- **i18n**: New keys for color mode labels (en + de)

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## MODIFIED Requirements
### Requirement: Route computation from waypoints
The Planner SHALL compute a route between ordered waypoints by calling the BRouter HTTP API with tiledesc enabled and returning the result as an EnrichedRoute, preserving per-point elevation, surface data, and segment boundary indices.
#### Scenario: Compute route with two waypoints
- **WHEN** the routing host submits two waypoints (start, end) with profile "trekking"
- **THEN** the BRouter API returns a route within 2 seconds
#### Scenario: Compute route with via points
- **WHEN** the routing host submits three or more waypoints
- **THEN** the BRouter API returns a route passing through all waypoints in order
#### Scenario: Per-point elevation preserved
- **WHEN** BRouter returns GeoJSON with 3D coordinates [lon, lat, ele]
- **THEN** the merged route response SHALL preserve elevation values for every coordinate point
#### Scenario: Segment boundaries tracked
- **WHEN** a route with N waypoints is computed (N-1 segments)
- **THEN** the response SHALL include an array of coordinate indices marking where each waypoint-to-waypoint segment begins
#### Scenario: Surface data extracted
- **WHEN** BRouter returns tiledesc messages with WayTags containing surface information
- **THEN** the response SHALL include a surface type string per coordinate point extracted from the WayTags (e.g., "asphalt", "gravel", "path")

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## MODIFIED Requirements
### Requirement: Route visualization
The map SHALL display the computed route as an interactive, optionally color-coded polyline on the map.
#### Scenario: Display route
- **WHEN** BRouter returns a route GeoJSON
- **THEN** the route is rendered as a polyline on the map, colored according to the active color mode
#### Scenario: Route updates on waypoint change
- **WHEN** a waypoint is added, moved, or deleted
- **THEN** the route polyline updates after BRouter recomputes the route
#### Scenario: Ghost marker on hover
- **WHEN** the cursor is within 15 pixels of the route polyline
- **THEN** a transient ghost marker appears at the nearest route point, which can be clicked or dragged to insert a waypoint (see route-splitting and route-drag-reshape specs)

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## ADDED Requirements
### Requirement: Route color modes
The Planner SHALL support multiple route color modes that visualize per-point data along the route.
#### Scenario: Default plain mode
- **WHEN** a route is first displayed
- **THEN** it renders as a single-color blue polyline (current behavior)
#### Scenario: Elevation color mode
- **WHEN** a user selects the "Elevation" color mode
- **THEN** the route polyline is colored with a gradient from green (low) through yellow (mid) to red (high), based on the elevation at each point
#### Scenario: Surface color mode
- **WHEN** a user selects the "Surface" color mode and surface data is available from BRouter tiledesc
- **THEN** the route polyline is colored by surface type (e.g., asphalt=gray, gravel=brown, path=green, track=orange)
#### Scenario: Surface data unavailable
- **WHEN** a user selects "Surface" color mode but BRouter did not return surface data
- **THEN** the route falls back to plain color mode
### Requirement: Color mode toggle
The Planner SHALL provide a UI control to switch between route color modes.
#### Scenario: Toggle control location
- **WHEN** a route is displayed
- **THEN** a color mode select dropdown is visible in the session header
#### Scenario: Color mode persists in session
- **WHEN** a user changes the color mode
- **THEN** the selection is stored in the Yjs routeData map and synced to all participants
### Requirement: Elevation chart color sync
The elevation profile chart SHALL use the same color gradient as the route when in elevation mode.
#### Scenario: Elevation mode chart coloring
- **WHEN** the color mode is set to "Elevation"
- **THEN** the elevation chart line and fill use the same green→yellow→red gradient as the route polyline
#### Scenario: Plain mode chart coloring
- **WHEN** the color mode is "Plain" or "Surface"
- **THEN** the elevation chart uses the default blue color

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## ADDED Requirements
### Requirement: Ghost marker on route hover
The Planner SHALL display a transient ghost marker when the cursor is near the route polyline, allowing users to reshape the route by dragging.
#### Scenario: Ghost marker appears on hover
- **WHEN** the cursor moves within 15 pixels of the route polyline
- **THEN** a ghost marker (small blue circle) appears at the nearest route coordinate point
#### Scenario: Ghost marker disappears on leave
- **WHEN** the cursor moves more than 15 pixels away from the route polyline
- **THEN** the ghost marker disappears
#### Scenario: Drag ghost marker to reshape
- **WHEN** a user drags the ghost marker to a new position
- **THEN** a new waypoint is inserted between the two adjacent waypoints of the hovered segment, and the route recomputes through the new point
#### Scenario: Trailer lines during drag
- **WHEN** a user is dragging the ghost marker
- **THEN** dashed guide lines are shown connecting the ghost marker to the adjacent waypoints
#### Scenario: No text selection during drag
- **WHEN** a user drags the ghost marker
- **THEN** text selection is disabled on the page (via Leaflet's built-in L.Draggable)
#### Scenario: Reshape syncs to other participants
- **WHEN** a user reshapes the route by dragging the ghost marker
- **THEN** all other participants see the new waypoint and recomputed route via Yjs sync

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## ADDED Requirements
### Requirement: Insert waypoint by clicking on route
The Planner SHALL allow users to insert a new waypoint by clicking the ghost marker that appears when hovering near the route.
#### Scenario: Click ghost marker to split
- **WHEN** a ghost marker is visible on the route and the user clicks it
- **THEN** a new waypoint is inserted at the ghost marker position between the appropriate adjacent waypoints, and the route recomputes
#### Scenario: Waypoint snaps to route
- **WHEN** the ghost marker appears near the route
- **THEN** it is positioned at the closest coordinate point on the existing route geometry, not at the raw cursor position
#### Scenario: No duplicate waypoint from map click
- **WHEN** a user clicks the ghost marker to insert a waypoint
- **THEN** the map click handler is suppressed so only one waypoint is inserted (not an additional one appended at the end)
#### Scenario: Split syncs to other participants
- **WHEN** a user inserts a waypoint by clicking the ghost marker
- **THEN** all other participants see the new waypoint appear in the waypoint list and on the map via Yjs sync

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## 1. BRouter Data Pipeline
- [x] 1.1 Modify `mergeGeoJsonSegments` to preserve 3D coordinates (lon, lat, ele) and track segment boundary indices
- [x] 1.2 Add `EnrichedRoute` interface with coordinates, segmentBoundaries, surfaces, and stats
- [x] 1.3 Store enriched route data (including segment boundaries and surfaces) in Yjs routeData map
- [x] 1.4 Add `tiledesc=true` to BRouter requests and extract surface types from WayTags messages
- [x] 1.5 Write unit test for segment boundary tracking across multi-waypoint routes
## 2. Route Interaction (ghost marker)
- [x] 2.1 Create `RouteInteraction` component — single persistent draggable Marker following brouter-web pattern
- [x] 2.2 Listen on `map.mousemove`, snap ghost marker to nearest route point within 15px tolerance (distance-based, not polyline events)
- [x] 2.3 On click, insert waypoint at snapped position using segment boundary lookup
- [x] 2.4 On drag, insert waypoint at drop position with trailer lines to adjacent waypoints
- [x] 2.5 Suppress map click handler after ghost insert to prevent duplicate waypoints
- [x] 2.6 Guard against flickering: `draggingRef` freezes snap updates during drag, distance-based mouseout
- [x] 2.7 Disable route interaction when no-go area drawing mode is active
## 3. Route Coloring
- [x] 3.1 Create `ColoredRoute` component — renders segmented L.Polyline instances with per-point colors
- [x] 3.2 Implement elevation gradient: normalize elevation to 0-1 range, map to green→yellow→red
- [x] 3.3 Implement surface coloring: extract surface types from BRouter tiledesc, map to color palette
- [x] 3.4 Fall back to plain mode when surface data is unavailable
- [x] 3.5 Add color mode state (`colorMode`) to Yjs routeData map, synced across participants
- [x] 3.6 Add color mode select dropdown to session header
- [x] 3.7 Sync elevation chart colors with route — use same `elevationColor()` gradient in ElevationChart
- [x] 3.8 Add i18n keys for color mode labels (en + de)
## 4. Verify
- [x] 4.1 E2E test: click near route inserts waypoint at correct position
- [x] 4.2 E2E test: color mode toggle switches between plain/elevation/surface
- [x] 4.3 E2E test: enriched route response includes segment boundaries and coordinates
- [x] 4.4 Unit test: segment boundary computation with 1, 2, and 4 segments
- [x] 4.5 Visual verification: ghost marker, drag with trailers, all color modes (cmux browser)

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schema: spec-driven
created: 2026-03-25

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## Context
The Journal has passkey auth (primary) and magic link login (fallback). Magic
links work in dev (auto-redirect) but in production the link is only logged
to console — users never receive it. No email infrastructure exists.
## Goals / Non-Goals
**Goals:**
- Actually deliver magic link emails in production
- Send a welcome email after registration
- Provider-agnostic email interface (easy to swap providers)
- HTML templates with plain-text fallback
- Easy to add new email types in the future (just add a template + call)
- Dev mode: still log to console / return devLink (no real emails)
**Non-Goals:**
- Marketing emails or newsletters
- Email preferences / unsubscribe (only transactional)
- Inline CSS / complex email layouts (keep it simple text-focused)
- Queuing or retry logic (provider handles delivery)
## Decisions
### D1: SMTP via nodemailer
Use [nodemailer](https://nodemailer.com) with SMTP — standard, provider-agnostic,
works with any SMTP server. Single dependency: `nodemailer` npm package.
Configured via `SMTP_URL` env var (e.g., `smtp://user:pass@mail.example.com:587`).
**Alternative considered**: Resend API. Simpler initial setup but creates vendor
dependency. SMTP is a standard protocol that works with any provider and aligns
with the self-hostable philosophy.
### D2: Email module in apps/journal/app/lib/email.server.ts
Not a shared package — only the Journal sends emails. Keep it simple:
- `sendEmail(to, subject, html, text)` — low-level sender
- `sendMagicLink(email, link)` — template wrapper
- `sendWelcome(email, username)` — template wrapper
In dev mode, `sendEmail` logs to console instead of calling Resend.
### D3: Inline HTML templates
Simple functions returning HTML strings. No template engine. Each email type
is a function: `magicLinkTemplate(link)`, `welcomeTemplate(username)`. Plain
text generated by stripping tags.
### D4: Sender domain: noreply@trails.cool
Requires DNS records (DKIM/SPF/DMARC) for deliverability. Add TXT records
via Terraform or manually in Hetzner DNS.
## Risks / Trade-offs
- **SMTP server required** → Must provide an SMTP server. Can use any provider
(Mailgun, Amazon SES, Postfix, etc.) or a simple relay.
- **DNS records required** → Must add SPF/DKIM/DMARC records for deliverability.
- **No built-in retry** → nodemailer doesn't queue. If SMTP is down, the send
fails. Acceptable for current scale — welcome emails are fire-and-forget,
magic links can be re-requested.

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## Why
Magic link login doesn't work in production — the link is logged to console
but never emailed to the user. Registration works (passkey-based) but the
fallback auth flow is broken. We need actual email delivery.
## What Changes
- Add a reusable email sending layer (`@trails-cool/email` or in-app module)
with a provider-agnostic interface so future emails are trivial to add
- Send magic link emails in production
- Send a welcome email after registration
- Use a transactional email provider (Resend, Postmark, or SMTP)
- HTML email templates with plain-text fallback
- Document email sending in the privacy manifest
## Capabilities
### New Capabilities
- `transactional-emails`: Send templated emails via a provider-agnostic interface. Current emails: magic link login, welcome on registration. Designed for easy addition of future email types.
### Modified Capabilities
- `journal-auth`: Magic link flow now actually sends the email instead of logging to console
## Impact
- **Files**: New email module (lib or package), modified `api.auth.login.ts`, modified registration flow, email templates
- **Dependencies**: One email provider SDK (e.g., `resend` or `nodemailer`)
- **Infrastructure**: Email provider API key as env var, DNS records for sender domain verification
- **Privacy**: Email addresses sent to third-party email provider — must document

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## MODIFIED Requirements
### Requirement: Magic link login
The magic link login flow SHALL deliver the link via email in production instead of logging to console.
#### Scenario: Production email delivery
- **WHEN** a user requests a magic link in production
- **THEN** the link is emailed to the user (not just logged to console)
#### Scenario: Dev mode unchanged
- **WHEN** a user requests a magic link in development
- **THEN** the link is returned directly for auto-redirect (existing behavior preserved)

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## ADDED Requirements
### Requirement: Email sending interface
The system SHALL provide a provider-agnostic email sending function that supports HTML and plain-text content.
#### Scenario: Send email in production
- **WHEN** the system sends a transactional email in production
- **THEN** the email is delivered via the configured provider (Resend) to the recipient
#### Scenario: Dev mode skips sending
- **WHEN** the system sends a transactional email in development
- **THEN** the email content is logged to console and no external API is called
### Requirement: Magic link email
The system SHALL send an email containing the magic link when a user requests passwordless login.
#### Scenario: Magic link delivered
- **WHEN** a user requests a magic link login
- **THEN** an email is sent with a clickable link that logs them in
#### Scenario: Email content
- **WHEN** a magic link email is sent
- **THEN** it includes: the link, expiry time (15 minutes), and plain-text fallback
### Requirement: Welcome email
The system SHALL send a welcome email after successful registration.
#### Scenario: Welcome on registration
- **WHEN** a user completes passkey registration
- **THEN** a welcome email is sent to their registered email address
### Requirement: Email templates
Each email type SHALL have an HTML template with a plain-text fallback.
#### Scenario: Extensible template pattern
- **WHEN** a new email type is needed in the future
- **THEN** it can be added by creating a template function and calling sendEmail
### Requirement: Privacy disclosure
Email sending SHALL be documented in the privacy manifest.
#### Scenario: Privacy manifest updated
- **WHEN** transactional emails are enabled
- **THEN** the /privacy page documents: what emails are sent, that email addresses are shared with the email provider, and which provider is used

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## 1. Email Infrastructure
- [x] 1.1 Add `nodemailer` package to Journal dependencies
- [x] 1.2 Create `apps/journal/app/lib/email.server.ts` with sendEmail(to, subject, html, text) — uses SMTP in production, logs to console in dev
- [x] 1.3 Add `SMTP_URL` and `SMTP_FROM` env vars to docker-compose.yml
- [x] 1.4 Write unit test for sendEmail (mock nodemailer, verify dev-mode logging)
## 2. Email Templates
- [x] 2.1 Create magicLinkTemplate(link: string) returning { html, text } — includes link, 15-min expiry note, trails.cool branding
- [x] 2.2 Create welcomeTemplate(username: string) returning { html, text } — greeting, what they can do, link to routes
- [x] 2.3 Wire sendMagicLink(email, link) and sendWelcome(email, username) helper functions
## 3. Integration
- [x] 3.1 Update api.auth.login.ts: call sendMagicLink in production instead of just logging
- [x] 3.2 Update registration flow: call sendWelcome after successful passkey registration
- [x] 3.3 Verify dev mode still works (devLink returned, no email sent)
## 4. Privacy & Config
- [x] 4.1 Update /privacy page: document email sending, provider (Resend), what data is shared
- [x] 4.2 Add `SMTP_URL` to server env and deploy documentation
- [x] 4.3 Document sender domain DNS setup (SPF/DKIM/DMARC for noreply@trails.cool)
## 5. Verify
- [x] 5.1 Test magic link email delivery locally with SMTP
- [x] 5.2 Test welcome email on registration
- [x] 5.3 Verify existing E2E tests still pass (dev mode unchanged)