v0.50.25: mobile scroll, import timestamps, profile security, mic fallback (#404)

* fix: restore mobile chat scrolling and drawer close (#397)

- static/style.css: add min-height:0 to .layout and .main (flex shrink chain fix for mobile scroll)
- static/style.css: add -webkit-overflow-scrolling:touch, touch-action:pan-y, overscroll-behavior-y:contain to .messages
- static/boot.js: call closeMobileSidebar() on new-conversation button onclick and Ctrl+K shortcut
- tests/test_mobile_layout.py: 41 new lines covering all three CSS fixes and both JS call sites

Original PR by @Jordan-SkyLF

* fix: preserve imported session timestamps (#395)

- api/models.py: add touch_updated_at: bool = True param to Session.save(); import_cli_session() accepts created_at/updated_at kwargs and saves with touch_updated_at=False
- api/routes.py: extract created_at/updated_at from get_cli_sessions() metadata and forward to import_cli_session(); use touch_updated_at=False on post-import save
- tests/test_gateway_sync.py: +53 lines — integration test verifying imported session keeps original timestamp and sorts correctly vs newer sessions; also fix: add WebUI session file cleanup in finally block

Original PR by @Jordan-SkyLF

* fix(profiles): block path traversal in profile switch and delete flows (#399)

Master was vulnerable: switch_profile and delete_profile_api joined user-supplied profile
names directly into filesystem paths with no validation. An attacker could send
'../../etc/passwd' as a profile name to traverse outside the profiles directory.

- api/profiles.py: add _resolve_named_profile_home(name) — validates name with
  ^[a-z0-9][a-z0-9_-]{0,63}$ regex then enforces path containment via
  candidate.resolve().relative_to(profiles_root); use in switch_profile()
- api/profiles.py: add _validate_profile_name() call to delete_profile_api() entry
- api/routes.py: add _validate_profile_name() call at HTTP handler level for
  both /api/profile/switch and /api/profile/delete (fail-fast at API boundary)
- tests/test_profile_path_security.py: 3 tests — traversal rejected, valid name passes

Cherry-picked commit aae7a30 from @Hinotoi-agent (PR was 62 commits behind master)

* feat: add desktop microphone transcription fallback (#396)

Mic button now works in browsers that support getUserMedia/MediaRecorder but
lack SpeechRecognition (e.g. Firefox desktop, some Chromium builds).

- static/boot.js: detect _canRecordAudio (navigator.mediaDevices + getUserMedia + MediaRecorder);
  keep mic button enabled when either SpeechRecognition or MediaRecorder is available;
  MediaRecorder fallback records audio, sends blob to /api/transcribe, inserts transcript
  into the composer; _stopMic() handles all three states (recognition, mediaRecorder, neither)
- api/upload.py: add transcribe_audio() helper — saves uploaded blob to temp file, calls
  transcription_tools.transcribe_audio(), always cleans up temp file
- api/routes.py: add /api/transcribe POST handler — CSRF protected, auth-gated, 20MB limit,
  returns {text:...} or {error:...}
- api/helpers.py: change Permissions-Policy microphone=() to microphone=(self) (required to
  allow getUserMedia in the same origin)
- tests/test_voice_transcribe_endpoint.py: 87 new lines — 3 tests with mocked transcription
- tests/test_sprint19.py: +1 regression guard (microphone=(self) in Permissions-Policy)
- tests/test_sprint20.py: 3 updated tests for new fallback-capability checks

Original PR by @Jordan-SkyLF

* docs: v0.50.25 release — version badge and CHANGELOG

---------

Co-authored-by: Nathan Esquenazi <nesquena@gmail.com>

tests/test_gateway_sync.py

@@ -275,6 +275,64 @@ def test_gateway_session_messages_readable():
         post('/api/settings', {'show_cli_sessions': False})
 
 
+def test_importing_older_gateway_session_preserves_original_timestamps_and_order():
+    """Importing an older gateway session should not bump it above newer WebUI sessions."""
+    conn = _ensure_state_db()
+    older_started_at = time.time() - 1800
+    imported_sid = 'gw_import_old_001'
+    newer_webui_sid = None
+    try:
+        newer_webui, status = post('/api/session/new', {'model': 'openai/gpt-5'})
+        assert status == 200, newer_webui
+        newer_webui_sid = newer_webui['session']['session_id']
+
+        rename, rename_status = post(
+            '/api/session/rename',
+            {'session_id': newer_webui_sid, 'title': 'Newer WebUI Session'},
+        )
+        assert rename_status == 200, rename
+
+        _insert_gateway_session(
+            conn,
+            session_id=imported_sid,
+            source='discord',
+            title='Older imported gateway session',
+            started_at=older_started_at,
+        )
+        post('/api/settings', {'show_cli_sessions': True})
+
+        imported, imported_status = post('/api/session/import_cli', {'session_id': imported_sid})
+        assert imported_status == 200, imported
+        imported_session = imported['session']
+        assert abs(imported_session['created_at'] - older_started_at) < 2, imported_session
+        assert abs(imported_session['updated_at'] - older_started_at) < 5, imported_session
+
+        sessions_payload, sessions_status = get('/api/sessions')
+        assert sessions_status == 200, sessions_payload
+        ordered_ids = [item['session_id'] for item in sessions_payload.get('sessions', [])]
+        assert newer_webui_sid in ordered_ids, ordered_ids
+        assert imported_sid in ordered_ids, ordered_ids
+        assert ordered_ids.index(newer_webui_sid) < ordered_ids.index(imported_sid), ordered_ids
+    finally:
+        try:
+            _remove_test_sessions(conn, imported_sid)
+            conn.close()
+        except Exception:
+            pass
+        if imported_sid:
+            try:
+                post('/api/session/delete', {'session_id': imported_sid})
+            except Exception:
+                pass
+        if newer_webui_sid:
+            try:
+                post('/api/session/delete', {'session_id': newer_webui_sid})
+            except Exception:
+                pass
+        post('/api/settings', {'show_cli_sessions': False})
+
+
+
 def test_gateway_sse_stream_endpoint_exists():
     """GET /api/sessions/gateway/stream returns a response (200 or 200-range)."""
     # The SSE endpoint requires show_cli_sessions to be enabled