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>

api/profiles.py

@@ -196,7 +196,7 @@ def switch_profile(name: str) -> dict:
     if name == 'default':
         home = _DEFAULT_HERMES_HOME
     else:
-        home = _DEFAULT_HERMES_HOME / 'profiles' / name
+        home = _resolve_named_profile_home(name)
         if not home.is_dir():
             raise ValueError(f"Profile '{name}' does not exist.")
 
@@ -287,6 +287,24 @@ def _validate_profile_name(name: str):
         )
 
 
+def _profiles_root() -> Path:
+    """Return the canonical root that contains named profiles."""
+    return (_DEFAULT_HERMES_HOME / 'profiles').resolve()
+
+
+def _resolve_named_profile_home(name: str) -> Path:
+    """Resolve a named profile to a directory under the profiles root.
+
+    Validates *name* as a logical profile identifier first, then resolves the
+    final filesystem path and enforces containment under ~/.hermes/profiles.
+    """
+    _validate_profile_name(name)
+    profiles_root = _profiles_root()
+    candidate = (profiles_root / name).resolve()
+    candidate.relative_to(profiles_root)
+    return candidate
+
+
 def _create_profile_fallback(name: str, clone_from: str = None,
                               clone_config: bool = False) -> Path:
     """Create a profile directory without hermes_cli (Docker/standalone fallback)."""
@@ -405,6 +423,7 @@ def delete_profile_api(name: str) -> dict:
     """Delete a profile. Switches to default first if it's the active one."""
     if name == 'default':
         raise ValueError("Cannot delete the default profile.")
+    _validate_profile_name(name)
 
     # If deleting the active profile, switch to default first
     if _active_profile == name:
@@ -422,7 +441,7 @@ def delete_profile_api(name: str) -> dict:
     except ImportError:
         # Manual fallback: just remove the directory
         import shutil
-        profile_dir = _DEFAULT_HERMES_HOME / 'profiles' / name
+        profile_dir = _resolve_named_profile_home(name)
         if profile_dir.is_dir():
             shutil.rmtree(str(profile_dir))
         else: