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_voice_transcribe_endpoint.py

@@ -0,0 +1,87 @@
+import io
+import json
+import sys
+import types
+
+from api.upload import handle_transcribe
+
+
+def _multipart_body(fields=None, files=None, boundary=b"voiceboundary"):
+    fields = fields or {}
+    files = files or {}
+    body = b""
+    for name, value in fields.items():
+        body += b"--" + boundary + b"\r\n"
+        body += f'Content-Disposition: form-data; name="{name}"\r\n\r\n'.encode()
+        body += str(value).encode() + b"\r\n"
+    for name, (filename, data, content_type) in files.items():
+        body += b"--" + boundary + b"\r\n"
+        body += (
+            f'Content-Disposition: form-data; name="{name}"; filename="{filename}"\r\n'
+            f'Content-Type: {content_type}\r\n\r\n'
+        ).encode()
+        body += data + b"\r\n"
+    body += b"--" + boundary + b"--\r\n"
+    return body, f"multipart/form-data; boundary={boundary.decode()}"
+
+
+class _FakeHandler:
+    def __init__(self, body: bytes, content_type: str):
+        self.rfile = io.BytesIO(body)
+        self.wfile = io.BytesIO()
+        self.headers = {
+            "Content-Type": content_type,
+            "Content-Length": str(len(body)),
+        }
+        self.status = None
+        self.sent_headers = {}
+
+    def send_response(self, status):
+        self.status = status
+
+    def send_header(self, key, value):
+        self.sent_headers[key] = value
+
+    def end_headers(self):
+        pass
+
+    def payload(self):
+        return json.loads(self.wfile.getvalue().decode("utf-8"))
+
+
+def test_handle_transcribe_requires_file_field():
+    body, content_type = _multipart_body(fields={"note": "missing file"})
+    handler = _FakeHandler(body, content_type)
+    handle_transcribe(handler)
+    assert handler.status == 400
+    assert handler.payload()["error"] == "No file field in request"
+
+
+def test_handle_transcribe_returns_transcript(monkeypatch):
+    fake_mod = types.ModuleType("tools.transcription_tools")
+    fake_mod.transcribe_audio = lambda path: {"success": True, "transcript": "hello from audio"}
+    monkeypatch.setitem(sys.modules, "tools.transcription_tools", fake_mod)
+
+    body, content_type = _multipart_body(
+        files={"file": ("voice.webm", b"RIFFfakeaudio", "audio/webm")}
+    )
+    handler = _FakeHandler(body, content_type)
+    handle_transcribe(handler)
+
+    assert handler.status == 200
+    assert handler.payload() == {"ok": True, "transcript": "hello from audio"}
+
+
+def test_handle_transcribe_surfaces_provider_error(monkeypatch):
+    fake_mod = types.ModuleType("tools.transcription_tools")
+    fake_mod.transcribe_audio = lambda path: {"success": False, "error": "STT not configured"}
+    monkeypatch.setitem(sys.modules, "tools.transcription_tools", fake_mod)
+
+    body, content_type = _multipart_body(
+        files={"file": ("voice.webm", b"RIFFfakeaudio", "audio/webm")}
+    )
+    handler = _FakeHandler(body, content_type)
+    handle_transcribe(handler)
+
+    assert handler.status == 503
+    assert handler.payload()["error"] == "STT not configured"