feat(ui-core,ui-lvgl): repeater control in the Core, L2 repeater mode

Min SNR now defaults to off on a fresh device (was 0 dB without a prefs file).

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

docs/development/l2-hardware-checklist.md

@@ -66,6 +66,15 @@ Confirmed: green dot inside the ring, waypoints much better, download works, set
 - [ ] Room server login from the phone app / L1 still works while this exists (only admin logins go to the new session)
 - [ ] L1 (ui-new): Tools > Admin works as before (login, saved password, typed values, confirm reboot); it now also skips the login for the node you just used
 
+## New: Repeater mode (2026-09-25)
+- [ ] Settings > CONNECTIVITY > Repeater (row shows Off / On and what it relays on): switch on → "Repeater on", the loop icon appears in the status bar; off → it goes away
+- [ ] Relay on Custom: the radio moves to the profile's frequency while on and back to the chat frequency when off (Settings > Radio row / another node on each frequency); Current: stays on the chat frequency
+- [ ] Custom profile: Preset dropdown, Frequency (typed, out-of-range refused), SF / BW / CR apply at once; while relaying on it the change is live
+- [ ] While on: Settings > Radio > Auto power is greyed ("Off while repeating") and TX runs at the set power
+- [ ] Another node two hops away receives messages through this device; Skip adverts stops relaying adverts only; Max hops / Min SNR / Yield / Skip duplicates / Scope only take effect (compare with L1 Tools › Repeater showing the same values)
+- [ ] Extra scopes popup: a switch per scope, the row counts "N of M relayed"; with no scopes it points to Settings > Radio
+- [ ] Fresh device (erased flash): Min SNR starts at Off, not 0 dB (fixed default, also on L1)
+
 ## New: My presets, scopes, battery display, clock seconds (2026-09-25)
 - [ ] Settings > Radio > MY PRESETS > Save current settings: name popup, Enter → "Preset saved", the row shows freq / SF / BW / CR with a tick while in use, and it is in the Preset dropdown
 - [ ] Tap a saved preset → Use (radio switches) / Delete (confirm, red) → "Preset deleted"; a 5th name replaces the oldest (hint says so when all 4 are used); presets survive a reboot

docs/development/ui-core.md

@@ -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, lock screen, battery display, battery shutdown, GPS power saving, time zone, 12-hour clock, clock seconds) 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` (`pinContact` / `pinChannel` move an entry that is already on another slot; the slot's name is `contactctl::favName`). The schema's display page also carries the lock screen (`auto_lock`) and the 12-hour clock, which ui-lvgl implements (a slide-to-unlock card after the screen turns off). 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. Diagnostics rows are `ui-core/Diagnostics.h` (`diag::`: live counters, system card, font card, counter reset), shown by ui-new's Tools > Diagnostics and ui-lvgl's Settings > Diagnostics. Auto-advert is a schema row (`advert_auto_interval_sec`, sent by MyMesh); ui-new keeps its Tools > Auto-Advert screen over the same pref. The compass (ui-lvgl Home > Compass, ui-new Tools > Compass) reads `UiCore::course`. Saving / deleting the user's radio presets is `radioctl::saveUserPreset` / `deleteUserPreset` (ui-new's preset picker and ui-lvgl's Radio > My presets); the scope list is edited through MyMesh (`addScope` / `renameScope` / `removeScope` / `setDefaultScope`), which ui-lvgl's Radio > Scopes and ui-new's Settings > Radio > Scope call directly. The battery percentage (LiPo curve, empty at the shutdown voltage) and the display mode are `ui-core/Battery.h`, used by both status bars; the schema carries Battery display and Clock seconds.
+`ui-core/SettingsSchema.h` holds three pages -- navigation (trail, live share, arrival alert, units), display & power (brightness, screen off, wake on message, lock screen, battery display, battery shutdown, GPS power saving, time zone, 12-hour clock, clock seconds) 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` (`pinContact` / `pinChannel` move an entry that is already on another slot; the slot's name is `contactctl::favName`). The schema's display page also carries the lock screen (`auto_lock`) and the 12-hour clock, which ui-lvgl implements (a slide-to-unlock card after the screen turns off). 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. Diagnostics rows are `ui-core/Diagnostics.h` (`diag::`: live counters, system card, font card, counter reset), shown by ui-new's Tools > Diagnostics and ui-lvgl's Settings > Diagnostics. Auto-advert is a schema row (`advert_auto_interval_sec`, sent by MyMesh); ui-new keeps its Tools > Auto-Advert screen over the same pref. The compass (ui-lvgl Home > Compass, ui-new Tools > Compass) reads `UiCore::course`. Saving / deleting the user's radio presets is `radioctl::saveUserPreset` / `deleteUserPreset` (ui-new's preset picker and ui-lvgl's Radio > My presets); the scope list is edited through MyMesh (`addScope` / `renameScope` / `removeScope` / `setDefaultScope`), which ui-lvgl's Radio > Scopes and ui-new's Settings > Radio > Scope call directly. The battery percentage (LiPo curve, empty at the shutdown voltage) and the display mode are `ui-core/Battery.h`, used by both status bars; the schema carries Battery display and Clock seconds. The companion's own repeater mode is `ui-core/RepeaterControl.h` (`rptctl::`: on / off with its radio, RX power-save and APC side effects, Current / Custom network with the profile seeded from the chat params, the profile's preset, the filters' ranges and labels, the extra scopes mask); ui-new's Tools > Repeater and ui-lvgl's Settings > Repeater use it, MyMesh does the relaying.
 
 Replaces the per-item code in `SettingsScreen`: