Add 8 proposed changes and old trails analysis

Proposed changes (all with proposal, design, specs, tasks):
- app-navigation (9 tasks) — nav bars for both apps
- planner-landing-page (7 tasks) — standalone landing page
- planner-multiplayer-awareness (13 tasks) — participants, cursors, names
- changelog (13 tasks) — public changelog with "what's new"
- transactional-emails (15 tasks) — magic link + welcome emails
- planner-features (18 tasks) — no-go areas, notes, recovery, rate limits
- komoot-import (23 tasks) — Komoot tour import
- route-features (37 tasks) — sharing, multi-day, spatial, photos

Also adds docs/old-trails-analysis.md with feature analysis from the
older trails project.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

openspec/changes/planner-features/specs/brouter-integration/spec.md

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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

openspec/changes/planner-features/specs/crash-recovery/spec.md

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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

openspec/changes/planner-features/specs/map-display/spec.md

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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

openspec/changes/planner-features/specs/no-go-areas/spec.md

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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

openspec/changes/planner-features/specs/planner-session/spec.md

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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)

openspec/changes/planner-features/specs/rate-limiting/spec.md

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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

openspec/changes/planner-features/specs/session-notes/spec.md

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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)