feat: add base shell, notes panel, back-navigation with stale propagation

Implements Task 4: base.html DaisyUI/Alpine shell, notes autosave panel,
nav.py phase switching with downstream stale marking, notes.py save/get
endpoints, state debug endpoint, and stub /triage route for test support.

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

services/travel-memories/app/routes/albums.py

@@ -1,3 +1,23 @@
-from flask import Blueprint
+from flask import Blueprint, current_app, render_template, request
+from app.state import load_state
 
 bp = Blueprint("albums", __name__)
+
+
+@bp.get("/triage")
+def triage():
+    album_id = request.args.get("album_id", "")
+    notes_content = ""
+    phase_stale = []
+    if album_id:
+        state = load_state(album_id, current_app)
+        if state:
+            notes_content = state.notes
+            phase_stale = state.phase_stale
+    return render_template(
+        "base.html",
+        current_phase="triage",
+        album_id=album_id,
+        notes_content=notes_content,
+        phase_stale=phase_stale,
+    )

services/travel-memories/app/routes/nav.py

@@ -1,3 +1,51 @@
-from flask import Blueprint
+from flask import Blueprint, current_app, jsonify, redirect, request
+from app.state import load_state, save_state
 
 bp = Blueprint("nav", __name__)
+
+STALE_DOWNSTREAM = {
+    "triage": ["curate", "group", "write"],
+    "curate": ["group", "write"],
+    "group": ["write"],
+    "write": [],
+    "export": [],
+}
+
+
+@bp.post("/nav/phase")
+def goto_phase():
+    body = request.get_json()
+    target = body["target_phase"]
+    state = load_state(body["album_id"], current_app)
+    if state is None:
+        return jsonify({"error": "no state"}), 404
+
+    # Mark downstream completed phases and the current phase as stale
+    downstream = STALE_DOWNSTREAM.get(target, [])
+    candidates = set(downstream) & (set(state.phases_completed) | {state.phase})
+    newly_stale = [p for p in candidates if p not in state.phase_stale]
+    state.phase_stale = list(set(state.phase_stale + newly_stale))
+    state.phase = target
+    save_state(state, current_app)
+    return jsonify({"ok": True, "phase": target})
+
+
+@bp.post("/nav/dismiss-stale")
+def dismiss_stale():
+    album_id = request.form["album_id"]
+    phase = request.form["phase"]
+    state = load_state(album_id, current_app)
+    if state:
+        state.phase_stale = [p for p in state.phase_stale if p != phase]
+        save_state(state, current_app)
+    return redirect(f"/{phase}?album_id={album_id}")
+
+
+@bp.get("/state/<album_id>")
+def get_state(album_id):
+    """Debug/test endpoint — returns full state JSON."""
+    state = load_state(album_id, current_app)
+    if state is None:
+        return jsonify({"error": "no state"}), 404
+    from dataclasses import asdict
+    return jsonify(asdict(state))

services/travel-memories/app/routes/notes.py

@@ -1,3 +1,25 @@
-from flask import Blueprint
+from flask import Blueprint, current_app, jsonify, request
+from app.state import load_state, save_state
 
 bp = Blueprint("notes", __name__)
+
+PHASE_ORDER = ["triage", "curate", "group", "write", "export"]
+
+
+@bp.post("/notes/save")
+def save_notes():
+    body = request.get_json()
+    state = load_state(body["album_id"], current_app)
+    if state is None:
+        return jsonify({"error": "no state"}), 404
+    state.notes = body["notes"]
+    save_state(state, current_app)
+    return jsonify({"ok": True})
+
+
+@bp.get("/notes/<album_id>")
+def get_notes(album_id):
+    state = load_state(album_id, current_app)
+    if state is None:
+        return jsonify({"error": "no state"}), 404
+    return jsonify({"notes": state.notes})