fix(keyboard): joystick-free Compact mode for external keyboards

Compact mode (Settings > Keyboard's "Ext. KB" row) is meant to guarantee
operation with no joystick at all, but it was still half-tied to the
on-screen grid it hides:

- arrows now move the text cursor directly instead of a grid selection
  nobody can see, and Tab opens the placeholder picker directly instead of
  the row/col-dependent Hold-Enter dispatch
- plain Enter submits the field (there's no grid cell to have deliberately
  landed on), same as Fn+Enter
- Fn+letter's accent popup no longer gates on the grid's script/T9
  settings -- CardKB always types plain Latin regardless of them, so the
  gate only made the gesture silently stop working
- the whole status line is gone: nothing it showed (script, T9-vs-ABC,
  caps) is actionable from an external keyboard. The freed height goes to
  message-preview lines, floored at the smallest grid's footprint so
  cursor mode's own hint block still fits
- the accent popup gets a fixed slot instead of anchoring on a `row` that
  is never deliberately navigated to in this mode

Also fixes a text-corrupting invariant break: moveCursorDirect() and
openPlaceholders() move the cursor without finalizing a pending T9
multi-tap cycle, so a later tap on the same cell within the timeout
overwrote an unrelated character. Every other cursor-moving path already
cleared it.

Fn+Tab is dropped as a separate shortcut -- plain Tab already covered
every case it did. Fn+Enter no longer reads as a dead key in cursor mode.

Direct typing moves into insertTyped(), one translation point documenting
what a future relabelled-keycap layout (Cyrillic/Greek) would need.

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

release-notes.md

@@ -3,12 +3,12 @@
 ### What's new
 
 - **Auto-Reply Bot is renamed to Remote Bot.** It's grown beyond auto-replies into remote device control (Actions, below), so the Tools screen entry and docs now say "Remote Bot" — same screen, same settings, nothing to reconfigure.
-- **Remote Bot gains Actions: `!buzz`, `!gps`, `!advert`.** A new **Actions** toggle (per target — Direct/Channel/Room, nested under each target's existing **Commands** toggle) enables three commands that change the device's own behaviour instead of just reporting on it: `!buzz [seconds]` sounds the buzzer as a find-me signal (default 5s, capped at 30s, sounds even if the buzzer is muted), `!gps on`/`!gps off` toggles GPS, and `!advert` sends an immediate advert. Off by default; combines with the existing query commands in one message the same way (`!batt !gps on` → `4.10V | GPS: on`).
+- **Remote Bot gains Actions: `!buzz`, `!gps`, `!advert`.** A new **Actions** toggle (per target — Direct/Channel/Room, nested under each target's existing **Commands** toggle) enables three commands that change the device's own behaviour instead of just reporting on it: `!buzz [seconds]` sounds the buzzer as a find-me signal (default 5s, capped at 30s, sounds even if the buzzer is muted), `!gps on`/`!gps off` toggles GPS, and `!advert` sends an immediate advert (0 hop). Off by default; combines with the existing query commands in one message the same way (`!batt !gps on` → `4.10V | GPS: on`).
 - **`!gps fix [seconds]` — single-shot GPS location, no need to leave GPS running.** Turns GPS on (if it wasn't already), waits for a stabilised fix (HDOP ≤ 2.0 — falls back to ≥8 satellites on GPS hardware that doesn't report HDOP — then averages for 10s), sends the position, and restores GPS to whatever state it was in before — up to a 90s timeout by default (override with an optional argument, clamped to 15-300s, for a poor sky view where 90s isn't always enough), after which it reports a partial fix (if it got at least some samples) or failure. Replies in two parts: an immediate "acquiring fix..." ack, then the actual position as a follow-up message once ready. Only one fix request can be in flight at a time (a second one gets "fix already pending"); same Actions toggle as `!buzz`/`!gps`/`!advert`.
 - **Bot Trigger fields accept multiple phrases.** Pack several trigger words into one Trigger field, comma-separated (`hi,hello there,yo`) — matching any one of them fires the reply, same as before for a single phrase.
 - **Remote Bot Actions gain `!gpio1`..`!gpio4`** (Wio Tracker L1 only — 4 otherwise-unused pins). Each pin is independently set to Off/Input/Output (GPIO1/GPIO2 also offer Analog) from a new **Tools › GPIO** screen; `!gpio1 on`/`!gpio1 off` drives an Output pin remotely, a bare `!gpio1` reports the current mode and reading (including a millivolt value in Analog mode). Gated by the same per-target Actions toggle as `!buzz`/`!gps`/`!advert`.
-- **Optional CardKB support (Wio Tracker L1, Grove I2C) — full keyboard-only navigation.** Plug an M5Stack CardKB into the Grove connector and it's auto-detected at boot — no setting to flip. Typing goes straight into the message/name field instead of navigating the on-screen keyboard grid; arrows and Esc work as expected everywhere else too (including inside the placeholder and accent popups). Enter acts like the physical centre button (advances the on-screen grid selection) rather than submitting, so **Fn+Enter** sends the message/confirms the field from anywhere, **Fn+`<letter>`** opens that letter's accent popup directly (no arrow-hunting needed — handy for Polish/Czech/etc. diacritics), and **Fn+Tab** opens the Hold-Enter equivalent (Shift-lock, clear field) for whatever's selected; plain **Tab** still opens the Hold-Enter context menu everywhere else (message reply/navigate, Bot/Admin/Repeater menus, …).
-- **Settings › Keyboard gets an "Ext. KB" row** (boards that support CardKB, above). Switching it to **Compact** hides the on-screen letter grid and special-row icons — a CardKB typist never looks at them — replacing them with a one-line status (current script/page, caps) plus a reminder of the Fn shortcuts; the accent and placeholder popups still show normally. Off (**Full**) by default.
+- **Optional CardKB support (Wio Tracker L1, Grove I2C) — full keyboard-only navigation.** Plug an M5Stack CardKB into the Grove connector and it's auto-detected at boot — no setting to flip. Typing goes straight into the message/name field instead of navigating the on-screen keyboard grid, always as plain Latin text regardless of the Settings › Keyboard language/type — arrows and Esc work as expected everywhere else too (including inside the placeholder and accent popups). Enter acts like the physical centre button (advances the on-screen grid selection) rather than submitting, so **Fn+Enter** sends the message/confirms the field from anywhere, and **Fn+`<letter>`** opens that letter's accent popup directly (no arrow-hunting needed — handy for Polish/Czech/etc. diacritics — and works no matter what language/keyboard type is configured, since CardKB always types Latin either way). **Tab** is the Hold-Enter equivalent everywhere, including message reply/navigate and the Bot/Admin/Repeater menus — same single shortcut whether or not the on-screen keyboard is showing.
+- **Settings › Keyboard gets an "Ext. KB" row** (boards that support CardKB, above). Switching it to **Compact** hides the on-screen letter grid, special-row icons, and status line entirely — a CardKB typist never looks at any of it, and none of it (script/page, T9-vs-ABC, caps) is actually actionable from CardKB anyway — replacing them with just a reminder of the Tab/Fn+letter shortcuts; the accent and placeholder popups still show normally. With the grid hidden, arrows and Tab take on more useful direct meanings instead of driving an invisible grid selection: **arrows** move the text cursor immediately (no more entering cursor mode first), **plain Enter** submits the message/field (same as Fn+Enter — there's no grid cell to commit), and **plain Tab** opens the placeholder picker directly. Compact is designed to need no joystick/physical button at all, and reclaims the freed space for extra message-preview lines. Off (**Full**) by default.
 
 ### Fixes