feat: add per-song MP3 download buttons to admin request page

Adds an admin download route (/admin/request/<rid>/download-song/<version>)
and Download buttons next to Version A and Version B in section 2 (Songs),
shown only when the MP3 exists on disk. Bumps version to 0.9.2.

README.md

@@ -1,6 +1,6 @@
 # Theme Song Booth (MusicGPT Edition)
 
-![Version](https://img.shields.io/badge/version-v0.9.1-blue)
+![Version](https://img.shields.io/badge/version-v0.9.2-blue)
 
 A Flask web application for running a convention booth where visitors request a custom AI-generated theme song. Operators manage the queue from an admin dashboard, generate prompts via Hermes, queue generations through the MusicGPT API, and deliver final songs by email.
 
@@ -78,7 +78,7 @@ The selected pronouns are stored in the `pronouns` column and included in confir
 |------|------|---------|
 | Login | `/admin/login` | Simple session-based login. Password comes from the `ADMIN_PASSWORD` environment variable. |
 | Dashboard | `/admin` | Main queue. Filter by status and auto-refresh at a configurable interval. Includes a **Refresh MusicGPT Status** button to manually poll all in-flight tasks. |
-| Request detail | `/admin/request/<id>` | Full control of one request: edit customer info, save prompt, copy Hermes callback, queue MusicGPT generation, poll a single MusicGPT task, view status/cost, view revision history, upload MP3 overrides, send preview, record payment, deliver files (MP3/WAV/cover), add operator notes, cancel generation, and generate STEMS. |
+| Request detail | `/admin/request/<id>` | Full control of one request: edit customer info, save prompt, copy Hermes callback, queue MusicGPT generation, poll a single MusicGPT task, view status/cost, view revision history, upload MP3 overrides, download individual Version A/B MP3s, send preview, record payment, deliver files (MP3/WAV/cover), add operator notes, cancel generation, and generate STEMS. |
 | Pricing | `/admin/pricing` | Configure fixed prices and up to 5 custom items. Also shows running MusicGPT cost totals in USD. |
 | Sales | `/admin/sales` | Report of all delivered requests with customer details and Square payment references. |
 | Settings | `/admin/settings` | Database health, backups, SMTP config, MP3 metadata defaults, revision limit, auto-refresh interval, kiosk mode, booth open/closed switch, Hermes API key management, MusicGPT webhook URL, album cover delivery toggle, automatic MusicGPT polling toggle, and system reset. |

VERSION

@@ -1 +1 @@
-0.9.1
+0.9.2

app.py

@@ -922,6 +922,24 @@ def admin_download_stems(rid):
     return send_file(buf, mimetype='application/zip', as_attachment=True, download_name=download_name)
 
 
+@app.route('/admin/request/<int:rid>/download-song/<version>')
+def admin_download_song(rid, version):
+    """Download a single song MP3 (Version A or B) for a request."""
+    redir = require_admin()
+    if redir:
+        return redir
+    req = get_request_by_id(rid)
+    if not req:
+        abort(404)
+    if version not in ('a', 'b'):
+        abort(404)
+    path = req.get('song_a_path') if version == 'a' else req.get('song_b_path')
+    if not path or not Path(path).exists():
+        flash('Song file not found.', 'error')
+        return redirect(url_for('admin_request', rid=rid))
+    return send_file(path, as_attachment=True, download_name=Path(path).name)
+
+
 # ---------------------------------------------------------------------------
 # Admin routes
 # ---------------------------------------------------------------------------

static/css/booth.css

@@ -558,6 +558,13 @@
   flex: 1;
 }
 
+.booth-page .song-download {
+  flex: 0 0 auto;
+  align-self: center;
+  font-size: 0.85rem;
+  padding: var(--space-1) var(--space-3);
+}
+
 .booth-page .file-select {
   background: var(--bg-input);
   border: 1px solid var(--border);

templates/admin/request.html

@@ -313,6 +313,9 @@
                 <span class="status-badge missing">Not ready</span>
                 {% endif %}
               </label>
+              {% if req.song_a_path and file_exists(req.song_a_path) %}
+              <a href="{{ url_for('admin_download_song', rid=req.id, version='a') }}" class="button-link song-download">⬇ Download</a>
+              {% endif %}
             </div>
             <div class="song-row">
               <input type="checkbox" id="delete_b" name="delete_song" value="b" {% if not (req.song_b_path and file_exists(req.song_b_path)) %}disabled{% endif %}>
@@ -326,6 +329,9 @@
                 <span class="status-badge missing">Not ready</span>
                 {% endif %}
               </label>
+              {% if req.song_b_path and file_exists(req.song_b_path) %}
+              <a href="{{ url_for('admin_download_song', rid=req.id, version='b') }}" class="button-link song-download">⬇ Download</a>
+              {% endif %}
             </div>
             <div class="actions">
               <button type="submit" class="button-danger" onclick="return confirm('Delete selected song files? This will reset the request to Prompt Ready.')">Delete Selected Songs</button>