feat: camera quality settings, audio processing toggles, config-seeded defaults

- Add camera video quality controls (resolution/framerate/bitrate/codec)
  to Settings > Video, mirroring the screen share settings UI
- Add audio processing toggles (echo cancellation, noise suppression,
  auto gain control) to Settings > Audio, replacing URL-param-only controls
- Display raw values inline on all sliders (framerate, bitrate, volume)
- Add config-seeded defaults: config.json media_quality values now seed
  Setting defaults for users who haven't explicitly set preferences
- Camera settings are applied when joining a call via ConnectionFactory

Signed-off-by: Ryan Emmick <ryanemmick4@gmail.com>

src/widget.test.ts

@@ -19,6 +19,7 @@ const createRoomWidgetClientSpy = vi.mocked(createRoomWidgetClient);
 vi.mock("./config/Config", () => ({
   Config: {
     init: vi.fn().mockImplementation(async () => Promise.resolve()),
+    get: vi.fn().mockReturnValue({}),
   },
 }));
 const configInitSpy = vi.mocked(Config.init);