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})

services/travel-memories/app/static/app.js

@@ -0,0 +1,34 @@
+function notesApp(initialNotes, albumId) {
+  return {
+    open: false,
+    notes: initialNotes,
+    status: '',
+    saveTimer: null,
+
+    scheduleAutosave() {
+      clearTimeout(this.saveTimer);
+      this.status = 'Saving…';
+      this.saveTimer = setTimeout(() => this.doSave(), 500);
+    },
+
+    async doSave() {
+      const res = await fetch('/notes/save', {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({ album_id: albumId, notes: this.notes }),
+      });
+      this.status = res.ok ? 'Saved ✓' : 'Error';
+    },
+
+    async convertToEntry(text) {
+      const res = await fetch('/group/from-note', {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({ album_id: albumId, text }),
+      });
+      if (res.ok) {
+        this.status = 'Added as entry ✓';
+      }
+    },
+  };
+}

services/travel-memories/app/templates/base.html

@@ -0,0 +1,68 @@
+<!DOCTYPE html>
+<html data-theme="forest" lang="en">
+<head>
+  <meta charset="UTF-8">
+  <title>travel-memories</title>
+  <link href="https://cdn.jsdelivr.net/npm/daisyui@4/dist/full.min.css" rel="stylesheet">
+  <script src="https://cdn.tailwindcss.com"></script>
+  <script defer src="https://cdn.jsdelivr.net/npm/alpinejs@3/dist/cdn.min.js"></script>
+</head>
+<body class="min-h-screen bg-base-200">
+
+  <!-- Navbar -->
+  <div class="navbar bg-base-100 shadow-sm sticky top-0 z-40">
+    <div class="navbar-start px-4 font-bold text-lg">travel-memories</div>
+    <div class="navbar-center">
+      <ul class="steps">
+        {% set phases = [('','Album'),('triage','Triage'),('curate','Curate'),('group','Group'),('write','Write'),('export','Export')] %}
+        {% for key, label in phases %}
+        <li class="step {% if current_phase == key %}step-primary{% endif %}
+                        {% if key in phase_stale %}step-warning{% endif %}">
+          {% if album_id %}
+          <a hx-post="/nav/phase" hx-vals='{"album_id":"{{ album_id }}","target_phase":"{{ key }}"}' href="/{{ key }}{% if album_id %}?album_id={{ album_id }}{% endif %}">{{ label }}</a>
+          {% else %}{{ label }}{% endif %}
+        </li>
+        {% endfor %}
+      </ul>
+    </div>
+    <div class="navbar-end px-4">
+      {% if album_id %}
+      <button class="btn btn-ghost btn-sm" @click="open = !open" x-data>📝 Notes</button>
+      {% endif %}
+    </div>
+  </div>
+
+  <!-- Stale warning -->
+  {% if current_phase in phase_stale %}
+  <div class="alert alert-warning rounded-none" id="stale-banner">
+    <span>You changed earlier decisions — review this phase before exporting.</span>
+    <form method="post" action="/nav/dismiss-stale">
+      <input type="hidden" name="album_id" value="{{ album_id }}">
+      <input type="hidden" name="phase" value="{{ current_phase }}">
+      <button class="btn btn-xs">Dismiss</button>
+    </form>
+  </div>
+  {% endif %}
+
+  <!-- Body with notes drawer -->
+  <div class="flex relative" x-data="notesApp('{{ notes_content | e }}', '{{ album_id }}')">
+    <div class="flex-1 min-w-0 transition-all" :class="open ? 'mr-80' : ''">
+      {% block content %}{% endblock %}
+    </div>
+
+    <!-- Notes panel -->
+    <div class="fixed right-0 top-16 h-[calc(100vh-4rem)] w-80 bg-base-100 shadow-2xl p-4 flex flex-col transition-transform z-30"
+         :class="open ? 'translate-x-0' : 'translate-x-full'" id="notes-panel">
+      <h3 class="font-bold text-base mb-2">Notes</h3>
+      <textarea class="textarea textarea-bordered flex-1 resize-none text-sm"
+                x-model="notes"
+                @input="scheduleAutosave()"
+                placeholder="Jot down memories at any time…"></textarea>
+      <div class="text-xs text-right mt-1 opacity-60" x-text="status"></div>
+    </div>
+  </div>
+
+  <script src="/static/app.js"></script>
+  {% block extra_scripts %}{% endblock %}
+</body>
+</html>