feat(ui): add composer enter-to-send toggle (#3178)

* feat(ui): add composer enter-to-send toggle and native hardware-keyboard detection

Replaces the settings-page "Enter sends with a keyboard attached" checkbox with
an EnterKeyToggle in the composer footer: plain Enter submits / Shift+Enter
inserts a newline when enabled, Shift+Enter submits / Enter inserts a newline
when disabled. Ctrl/Cmd+Enter always submits as the soft-keyboard fallback.
Persisted as enterToSend.

Adds the Android HardwareKeyboardPlugin: scans input devices for an alphabetic
physical keyboard (ignoring phantom key/sensor devices), re-answers on config
changes/foreground, and confirms attachment from real hardware key events.
MainActivity surfaces key events to it before the WebView consumes them. The
composer and draft layout start keyboard-aware instead of inferring one focus
late; ComposerEditor preserves Enter modifiers through CodeMirror's deferred
re-dispatch so the toggle can tell Shift/Ctrl+Enter from plain Enter.

Removes the settings search entry and i18n keys for the old checkbox.

* refactor(ui): keep enter-to-send branch focused

* fix(ui): preserve enter-toggle taps on touch

* fix(ui): preserve enter key defaults and move setting

* fix(ui): keep enter setting lint-clean

* fix(i18n): preserve current Turkish message parity

* fix(settings): persist enter-to-send preference

* fix(ui): clarify enter-to-send setting

* fix(ui): apply enter preference on desktop

* fix(ui): match enter setting focus mode default

* test(ui): cover enter key policy matrix

* fix(ui): harden deferred enter handling

* fix(chat): preserve untouched Enter policy and validate settings

---------

Co-authored-by: Bohdan Triapitsyn <artmore@protonmail.com>

packages/vscode/src/bridge-settings-runtime.ts

@@ -5,6 +5,7 @@ import * as path from 'path';
 import * as vscode from 'vscode';
 import { BUILT_IN_SKILL_LOCATION, type DiscoveredSkill, type SkillScope, type SkillSource } from './opencodeConfig';
 import type { BridgeContext } from './bridge';
+import { enterSettingsSchema } from './settings-changes';
 
 const SETTINGS_KEY = 'openchamber.settings';
 const OPENCHAMBER_SHARED_SETTINGS_PATH = path.join(os.homedir(), '.config', 'openchamber', 'settings.json');
@@ -292,6 +293,14 @@ export const readSettings = (ctx?: BridgeContext): Record<string, unknown> => {
 export const persistSettings = async (changes: Record<string, unknown>, ctx?: BridgeContext): Promise<Record<string, unknown>> => {
   const current = readSettings(ctx);
   const restChanges = stripDerived({ ...(changes || {}) });
+  const enterSettings = enterSettingsSchema.parse(restChanges);
+  for (const key of ['enterToSend', 'enterToSendConfigured'] as const) {
+    if (enterSettings[key] === undefined) {
+      delete restChanges[key];
+    } else {
+      restChanges[key] = enterSettings[key];
+    }
+  }
 
   const keysToClear = new Set<string>();