chore: prepare automation loop for Plan 2 (M8–M20)

- Add PLAN2.md with 116 tasks across M8–M20 with testing gates
- Populate loop/plan.md with all new tasks (30-attempt retry policy)
- Update loop/prompt.md to enforce glass design system and PLAN2.md
- Fix PassphraseDialog to use glass-card/gradient-button design system
- Fix crypto.randomUUID fallback for non-secure contexts
- Fix dev.sh to skip proxy startup if port 3141 already in use
- Fix PWA manifest for Android A2HS (purpose:any, display_override, id)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/app/scripts/dev.sh

@@ -18,10 +18,13 @@ trap cleanup EXIT INT TERM
 # Use local node_modules binaries
 BIN="$APP_DIR/node_modules/.bin"
 
-# Start Claude proxy in background
-"$BIN/tsx" server/claude-proxy.ts &
-
-sleep 0.3
+# Start Claude proxy in background (skip gracefully if already running on :3141)
+if lsof -ti:3141 > /dev/null 2>&1; then
+  echo "  Claude proxy already running on :3141 — skipping"
+else
+  "$BIN/tsx" server/claude-proxy.ts &
+  sleep 0.3
+fi
 
 # Start Vite dev server in background
 "$BIN/vite" --host &