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-multiplayer-awareness/tasks.md

@@ -0,0 +1,27 @@
+## 1. Name Editing
+
+- [ ] 1.1 Update use-yjs.ts: allow updating user name via a returned setter function
+- [ ] 1.2 Save updated name to localStorage and sync via awareness.setLocalStateField
+- [ ] 1.3 Add i18n keys for participant UI (en + de)
+
+## 2. Participant List
+
+- [ ] 2.1 Create ParticipantList component showing all awareness states (name, color dot, host badge)
+- [ ] 2.2 Add inline name edit when clicking own name in the list
+- [ ] 2.3 Integrate ParticipantList into SessionView header
+
+## 3. Cursor Styling
+
+- [ ] 3.1 Replace current divIcon cursor with SVG pointer arrow + styled name tag (background, shadow, rounded)
+- [ ] 3.2 Set cursor z-index below map controls to avoid overlap
+
+## 4. Join/Leave Toasts
+
+- [ ] 4.1 Track awareness changes (added/removed clients) in SessionView
+- [ ] 4.2 Show auto-dismissing toast when participant joins or leaves (3 second duration)
+
+## 5. Verify
+
+- [ ] 5.1 Test with two browser windows: verify participant list, name editing, cursor rendering
+- [ ] 5.2 Verify join/leave toasts appear correctly
+- [ ] 5.3 Verify name persists across page refresh (localStorage)