Add MicroslopSam TTS, Flextalk voice profiles, effects, and engine controls

docs/webui.md

@@ -64,9 +64,15 @@ With plain HTTP, `navigator.mediaDevices` only exists on localhost; remote brows
 - Right column: **In voice** (favourited users in a call, grouped by call), **Favourites**, and
   **Open DMs & groups** as quick access. The guild's own occupied channels live in the left rail.
 - Speaking users show animated level bars and a bold name (design 2c: audio → video → share marks).
+  The bars scale up when speaking starts and stay on until an explicit stop, a mute, or a channel
+  change. A missing stop event leaves them on by design; they do not decay on their own. The
+  fade-out runs the equalizer inside a shrinking container, so the amplitude drops to nothing
+  instead of the block collapsing at full height. Muted members never show bars.
   Nicknames come from the guild member store; DMs fall back to the username.
 - Console: Tool calls, Events (live SSE), Transcript. The ticker shows the newest event. The
-  Transcript tab lists captured segments (time, speaker, text, WAV) and updates live.
+  Transcript tab lists captured segments (time, speaker, text, WAV) and updates live. It has
+  **Start**, **Stop**, and **Refresh** buttons; the status line shows `capturing` or `capture off`
+  plus the segment count.
 - Opening a chat fetches the latest 50 messages from Discord into the client cache. The refresh
   button by the channel header re-fetches. Live message events read the cache. Edited messages show
   an `edited` marker and replies show `↳ replying to <name>`.
@@ -131,9 +137,19 @@ The Settings button opens a slide-over:
 - **Client** — a collapsible group with:
   - **Bot audio** — engine status, TTS provider state, a **Connect devices** button, and the
     capture toggle. These are the daemon host's devices.
-  - **Speech** — the TTS engine (Auto / Local / API), language, and voice. Voices are grouped by
-    base language and filtered by the chosen language; English, Swedish, German, Danish,
-    Norwegian, Russian, and Cherokee are pinned on top. Stored in the daemon preferences.
+  - **Speech** — the TTS engine (Auto plus every configured engine: espeak-ng, the command engine
+    by its `VESKSLOP_TTS_NAME`, and the HTTP API), language, and voice. **Start engine** warms the
+    selected engine (starts Xvfb, Wine, and the host for the command engine). Selecting an engine
+    switches the voice list to that engine; the language row hides for single-language engines.
+    Voices are grouped by base language and filtered by the chosen language; English, Swedish,
+    German, Danish, Norwegian, Russian, and Cherokee are pinned on top. Stored in the daemon
+    preferences. Speed (0.5x–2.0x with 0.5/0.75/1/1.25/1.5 presets), pitch (-12 to +12
+    semitones), and an Expression slider (0–100, Flextalk voices only) live in the TTS panel and
+    save to the same preferences; controls the selected voice does not support stay hidden. For
+    Flextalk voices the TTS panel also opens the **Flextalk voice profile** window: a movable panel
+    that recenters on each open, with character sliders, five named presets, radio-kit effects
+    (high-pass, echo, word mode), and test lines (Attention, Laboratory, Critical, Health,
+    Radiation, plus two custom) that speak immediately.
   - **Display** — the timestamp timezone. Defaults to the browser's zone
     (`Intl.DateTimeFormat().resolvedOptions().timeZone`); pick any IANA zone to override. Stored in
     `localStorage` and applied to messages, the transcript, the event log, the action log, and the
@@ -141,7 +157,9 @@ The Settings button opens a slide-over:
   - **Browser audio** — puppeting controls: the browser output device for Client audio, a
     placeholder mic select, and the call-audio state. **Enable browser audio** asks for the
     microphone permission, which browsers require before they list output devices. Separate from
-    the bot's devices.
+    the bot's devices. Clicking **Client audio** in the header does the same: it asks for the
+    permission, unlocks the audio context in the same click, and then starts listening. A second
+    click stops it.
 - **Server** — a collapsible group with:
   - **Core process** — state, last exit, output, Start / Stop / Restart.
   - **Account login** — token file state, QR login, captcha.
@@ -200,6 +218,8 @@ replaceable.
 | GET | `/api/dms` | `limit?` | Cached DM and group DM channels with recipients |
 | GET | `/api/voice` | `userId?`, `guildId?` | One user's voice state |
 | GET | `/api/voice/overview` | `guildId` | Occupied voice channels and members |
+| GET | `/api/voice/volume` | `userIds?` comma-separated | Per-user volumes plus output volume; defaults to the current call |
+| POST | `/api/voice/volume` | `userId`, `volume` | Set a user's playback volume (0 to 200) |
 | POST | `/api/voice/join` | `channelId`, `mute?` | Join a voice channel (muted by default) |
 | POST | `/api/voice/leave` | none | Leave the current voice channel |
 | POST | `/api/voice/move` | `channelId` | Move to another voice channel |
@@ -207,11 +227,11 @@ replaceable.
 | POST | `/api/preferences` | `visibleGuilds?`, `tts?` | Update preferences. Stored in `<state dir>/preferences.json`. |
 | GET | `/api/audio` | none | Audio engine, TTS, queue, ducking, capture state |
 | GET | `/api/audio/devices` | none | The client's input and output devices |
-| GET | `/api/audio/tts/voices` | none | Local TTS voices (espeak-ng) |
+| GET | `/api/audio/tts/voices` | `engine?` | Voices for the selected engine (espeak-ng or `VESKSLOP_TTS_VOICES`) |
 | POST | `/api/audio/connect` | none | Re-apply the virtual devices to the client |
 | WS | `/audio` | `{"type":"listen","on":bool}` | Raw 48 kHz mono PCM of the call |
 | POST | `/api/audio/devices` | `inputDeviceId?`, `outputDeviceId?` | Set the client's devices |
-| POST | `/api/audio/speak` | `text`, `provider?`, `voice?` | Queue text to speech |
+| POST | `/api/audio/speak` | `text`, `provider?`, `voice?`, `speed?`, `pitch?` | Queue text to speech |
 | POST | `/api/audio/stop` | none | Stop speech and clear the queue |
 | POST | `/api/audio/capture` | `start` | Start or stop capture |
 | GET | `/api/transcript` | `limit?`, `sessionId?` | Sessions and captured segments |