Add map previews to journal route and activity pages

- Route/activity list pages: map thumbnails with route drawn on OSM tiles
- Route/activity detail pages: interactive Leaflet map with zoom controls
- Server: expose GeoJSON from PostGIS via ST_AsGeoJSON (simplified for lists)
- RouteMapThumbnail component: shared, supports thumbnail and interactive modes
- Placeholder shown for routes/activities without geometry
- Archive journal-route-previews change, sync specs

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

openspec/changes/journal-route-previews/specs/map-display/spec.md

@@ -0,0 +1,9 @@
+## MODIFIED Requirements
+
+### Requirement: Map components used in journal app
+The `@trails-cool/map` package's `MapView` and `RouteLayer` components SHALL be used in the journal app for route previews, in addition to the planner.
+
+#### Scenario: Journal uses shared map components
+- **WHEN** the journal renders a route map preview or detail map
+- **THEN** it uses `MapView` and `RouteLayer` from `@trails-cool/map`
+- **AND** no map code is duplicated between planner and journal

openspec/changes/journal-route-previews/specs/route-management/spec.md

@@ -0,0 +1,13 @@
+## MODIFIED Requirements
+
+### Requirement: Route data includes geometry for rendering
+Route and activity loaders SHALL return GeoJSON geometry when available.
+
+#### Scenario: Route list returns simplified geometry
+- **WHEN** the routes list loader runs
+- **THEN** each route includes a `geojson` field containing the geometry as a GeoJSON string
+- **AND** the geometry is simplified server-side via `ST_Simplify()` for list page performance
+
+#### Scenario: Route detail returns full geometry
+- **WHEN** the route detail loader runs and the route has geometry
+- **THEN** the route includes a `geojson` field with the full-resolution GeoJSON geometry

openspec/changes/journal-route-previews/specs/route-preview/spec.md

@@ -0,0 +1,34 @@
+## ADDED Requirements
+
+### Requirement: Route map preview on list pages
+Route and activity list pages SHALL show a small map thumbnail for each item that has geometry.
+
+#### Scenario: Route with geometry
+- **WHEN** the routes list page loads and a route has a `geom` column
+- **THEN** a small map thumbnail is rendered showing the route path
+- **AND** the map auto-fits to the route bounds
+
+#### Scenario: Route without geometry
+- **WHEN** a route has no `geom` (legacy route)
+- **THEN** a placeholder is shown instead of a map thumbnail
+
+#### Scenario: Activity with geometry
+- **WHEN** the activities list page loads and an activity has a `geom` column
+- **THEN** a small map thumbnail is rendered showing the activity path
+
+### Requirement: Interactive map on detail pages
+Route and activity detail pages SHALL show an interactive read-only map with the route/activity drawn.
+
+#### Scenario: Route detail with geometry
+- **WHEN** a user views a route detail page and the route has geometry
+- **THEN** a full-width interactive map is shown with the route path
+- **AND** the map has zoom controls and layer switching
+- **AND** the map auto-fits to the route bounds
+
+#### Scenario: Activity detail with geometry
+- **WHEN** a user views an activity detail page and the activity has geometry
+- **THEN** a full-width interactive map is shown with the activity path
+
+#### Scenario: Detail page without geometry
+- **WHEN** a route or activity has no geometry
+- **THEN** no map section is rendered