polish(ui): text/icon consistency pass across Tools, Settings, and menus

- RepeaterScreen: drop the redundant "Rpt " prefix on the profile fields
  (Preset/Freq/SF/BW/CR), matching Settings > Radio's own terminology --
  the screen is already dedicated to the repeater's own profile, so the
  prefix disambiguated nothing.
- Channel context menu: "Fav: yes/no" -> "Fav: ON/OFF", matching every
  other toggle in the app.
- Settings (System tab): six labels left as raw concatenated identifiers
  (AutoOff/AutoLock/TimeZone/LowBat/BattDisp/BzrVol) now read like their
  space-separated neighbours (Auto pwr/Pwr save/DM sound/GPS pwr), and
  BzrVol no longer clashes with "Buzzer" one row above it for the same
  feature. Three value-label arrays also had one mismatched-case entry
  fixed to match its siblings: Auto-off's "never" -> "OFF", Batt display's
  "icon" -> "Icon", Sound's "built-in" -> "Built-in".
- ToolsScreen: re-enabled the mini-icons next to each tool, which had
  been commented out ("don't fit visually"). Root cause: the screen's own
  drawIcon() centred against lineStep() (line height + inter-row gap)
  instead of getLineHeight() alone, 2px too generous for a near-full-
  height icon -- now delegates to the already-correct miniIconDraw() used
  elsewhere (e.g. the message-list ack checkmark). Also gave Admin and
  GPIO their own icons (padlock, 3-pin header) instead of both sharing
  System's cog.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

docs/solo_features/message_screen/message_screen.md

@@ -137,7 +137,7 @@ In the **Rooms** list the context menu instead offers:
 | Mark all read             | Clears all unread for this channel                                    |
 | Notif: default / OFF / ON | Per-channel notification override — **LEFT/RIGHT** to cycle           |
 | Melody: global / M1 / M2  | Per-channel melody override — **LEFT/RIGHT** to cycle                 |
-| Fav: yes / no             | Add or remove this channel from favourites — **LEFT/RIGHT** to toggle |
+| Fav: ON / OFF             | Add or remove this channel from favourites — **LEFT/RIGHT** to toggle |
 | Edit                      | Opens the Add/Edit form below, pre-filled with the channel's name    |
 | Delete                    | Removes the channel immediately (no confirm prompt)                   |
 

docs/solo_features/tools_screen/tools_screen.md

@@ -532,9 +532,9 @@ Navigate with **UP/DOWN**; change a value with **LEFT/RIGHT** (or **Enter** for
 | -------------- | --------------- | -------------------------------------------------------------------------------------------------------------- |
 | Repeater       | ON / OFF        | Master switch. The options below appear only while it is ON.                                                    |
 | Network        | Current / Custom | **Custom** _(default)_: enabling the repeater switches to a dedicated profile (below), disabling restores the companion's settings. A never-configured device seeds Custom from your own network's band (433/868/915 MHz region), not a flat default, so it can't land outside what's legal for your region. **Current**: relay on the companion's own frequency — opt-in, not the community norm. |
-| Rpt preset     | named presets   | _(Custom only)_ **Enter** picks a community/saved preset for the repeater profile. |
-| Rpt freq       | chip range      | _(Custom only)_ **Enter** opens the digit-by-digit editor (chip-validated bounds). |
-| Rpt SF / BW / CR | 5–12 / 7.8–500 kHz / 5–8 | _(Custom only)_ **LEFT/RIGHT** to adjust the profile's spreading factor, bandwidth, coding rate. |
+| Preset         | named presets   | _(Custom only)_ **Enter** picks a community/saved preset for the repeater profile. |
+| Freq           | chip range      | _(Custom only)_ **Enter** opens the digit-by-digit editor (chip-validated bounds). |
+| SF / BW / CR   | 5–12 / 7.8–500 kHz / 5–8 | _(Custom only)_ **LEFT/RIGHT** to adjust the profile's spreading factor, bandwidth, coding rate. |
 | Skip advert    | ON / OFF        | Don't re-flood **advert** packets (the highest-volume flood traffic); messages and acks still relay.           |
 | Max hops       | OFF / 1–8       | Drop a flood packet once it has already travelled this many hops.                                              |
 | Yield          | OFF / x2–x9     | Scales the retransmit delay for **forwarded** floods only (your own sends are unaffected), so a mobile companion defers to better-sited fixed repeaters. Widens the window for **Suppress dup**. |