feat(ui-core,ui-lvgl): room sessions and contact helpers in the Core, L2 rooms, conversation options, message actions

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/development/ui-core.md

@@ -32,7 +32,7 @@ interleaved. Classified:
 - `Trail.h` / `TrailStore`, `ScopeList.h`. Waypoints ✅ `ui-core/WaypointModel.h` (store + `/waypoints` persistence + "delete clears the Locator target"; ui-new's `UITask::waypoints()` forwards to it).
 
 **Engines — logic living inside `UITask.cpp` / `UITask.h`**
-- Unread tracking — DM unread table ✅ (`ui-core/DmUnreadTable.h`), room unread (still in `UITask`).
+- Unread tracking — DM unread table ✅ (`ui-core/DmUnreadTable.h`), room unread (one counter in `UiCore`). Room logins ✅ `ui-core/RoomSessions.h`.
 - Notifications ✅ split: the Core decides *what* happened (`MessageArrived` with kind / DM sender / channel slot, `AdvertHeard`); the frontend decides *how* to show it (`showAlert`, `SoundNotifier`, vibration, LED, wake-on-message) — those are platform services.
 - Live share ✅ `ui-core/LiveShareEngine.h` — session timer, movement/heartbeat gate, send + scope guard, peers' `LiveTrackStore` + expiry.
 - Locator ✅ `ui-core/LocatorEngine.h` — active target, geofence state machine, proximity beeper.
@@ -110,7 +110,7 @@ call the same ones, so e.g. "marking a channel read" has one implementation.
 
 ### 5. Declarative settings schema
 
-`ui-core/SettingsSchema.h` holds three pages -- navigation (trail, live share, arrival alert, units), display & power (brightness, screen off, wake on message, battery shutdown, GPS power saving, time zone) and messages & contacts (DM resends, contact expiry, favourites first). An entry is a one-byte index by default, or a `values` table over a 1/2/4-byte field (seconds, millivolts, an hour offset, `{1, 0}` for a field stored inverted); side effects run through `UiCore` (`applyGpsInterval()`, `host()->applyDisplayPrefs()`). ui-lvgl renders each page; ui-new still uses its own screens. Radio settings are not schema rows (preset list, typed frequency, radio side effects): `ui-core/RadioControl.h` applies them (`applyParams`, `applyTxPower`, `applyApc`, presets = built-ins + user slots) for both ui-new's Settings > Radio and ui-lvgl's Radio screen. Channel management is `ui-core/ChannelControl.h` (`chanctl::`): add Public / Hashtag / Private (passphrase or 32-hex key), rename, delete, notifications / favourite / scope, and `onRemoved()` -- the cleanup of every channel-keyed pref, run by `UiCore::onChannelRemoved` whoever deleted the channel (this device or the app); contacts get the same through `UiCore::cleanupContactPrefs`. Favourites dial slots: `ui-core/Favourites.h`. Remote admin is `ui-core/AdminSession.h` (`UiCore::admin`): login with the saved password (forgotten on a wrong password or a silent timeout), CLI round trips with timeouts, the field table (`admin::`), typed values; results come out one at a time through `take()`. `UiCore` offers login answers and CLI replies to it first; only room logins it wasn't waiting for reach the frontend. ui-new's Tools > Admin and ui-lvgl's Admin screen are views over it. The bot's settings are a table too, `ui-core/BotConfig.h` (`botcfg::`: tabs, rows, the NodePrefs flag / text / hour behind each, reply placeholders); ui-new's Tools > Bot and ui-lvgl's Bot screen render it, the bot itself runs in MyMesh.
+`ui-core/SettingsSchema.h` holds three pages -- navigation (trail, live share, arrival alert, units), display & power (brightness, screen off, wake on message, battery shutdown, GPS power saving, time zone) and messages & contacts (DM resends, contact expiry, favourites first). An entry is a one-byte index by default, or a `values` table over a 1/2/4-byte field (seconds, millivolts, an hour offset, `{1, 0}` for a field stored inverted); side effects run through `UiCore` (`applyGpsInterval()`, `host()->applyDisplayPrefs()`). ui-lvgl renders each page; ui-new still uses its own screens. Radio settings are not schema rows (preset list, typed frequency, radio side effects): `ui-core/RadioControl.h` applies them (`applyParams`, `applyTxPower`, `applyApc`, presets = built-ins + user slots) for both ui-new's Settings > Radio and ui-lvgl's Radio screen. Channel management is `ui-core/ChannelControl.h` (`chanctl::`): add Public / Hashtag / Private (passphrase or 32-hex key), rename, delete, notifications / favourite / scope, and `onRemoved()` -- the cleanup of every channel-keyed pref, run by `UiCore::onChannelRemoved` whoever deleted the channel (this device or the app); contacts get the same through `UiCore::cleanupContactPrefs`. Favourites dial slots: `ui-core/Favourites.h`. Remote admin is `ui-core/AdminSession.h` (`UiCore::admin`): login with the saved password (forgotten on a wrong password or a silent timeout), CLI round trips with timeouts, the field table (`admin::`), typed values; results come out one at a time through `take()`. `UiCore` offers login answers and CLI replies to it first; only room logins it wasn't waiting for reach the frontend. ui-new's Tools > Admin and ui-lvgl's Admin screen are views over it. The bot's settings are a table too, `ui-core/BotConfig.h` (`botcfg::`: tabs, rows, the NodePrefs flag / text / hour behind each, reply placeholders); ui-new's Tools > Bot and ui-lvgl's Bot screen render it, the bot itself runs in MyMesh. Room servers: `ui-core/RoomSessions.h` (`UiCore::rooms`) keeps who is logged in this session, the one login in flight (with a timeout) and the saved passwords (saved on success, forgotten on failure); `open(contact)` says whether to go straight in, wait for a background login or ask for a password, and outcomes come out through `take()`. Per-contact helpers are `ui-core/ContactControl.h` (`contactctl::`: DM notification / melody overrides, favourite flag, the `@[name] ` reply prefix, splitting a room post into author and text, naming a message's path hops). ui-new's Messages and ui-lvgl's Chats / thread use both.
 
 Replaces the per-item code in `SettingsScreen`: