Merge branch 'feature/intelligent-polish-and-personal-dict' into main

Resolved real conflicts introduced by translation-polish-2 (#3) and
docs refresh (#4) being merged to main during development:

- OSGKeyboardShared/Models/ProviderConfig.swift
  Add polishIntensity field alongside translationTargetLocaleId /
  polishScenarioId / handednessPreference. Both new fields coexist.

- OSGKeyboardShared/Services/AppGroupStore.swift
  Keep main's translation setters; add polishIntensity setter,
  detectedAppContext setter, and personalDictionary getter/setter.

- OSGKeyboardShared/Services/PolishingService.swift
  Merge v0.2.1 translate-and-polish path with v0.3.0 context-aware
  intelligent prompt. New polish() entry point accepts both modes;
  translation mode still uses TranslationPrompt, polish mode now
  uses buildPrompt(for:context:).

- OSGKeyboard/Views/SettingsView.swift
  Compose localEngineSettingsSection (main) with polishIntensitySection,
  languageAndModelsSection, systemPromptLinkSection, personalDictionaryLinkSection (feature).

- OSGKeyboardShared/{en,zh-Hans}.lproj/Shared.strings
  Concat scenario keys + polish intensity / app context / dictionary keys.

Auto-merged without conflict:
- AppGroupStore new methods (localASRBackend, etc.)
- FlowSessionManager, KeyboardViewController (auto-merged)
- MaterialIcon, HistoryView (auto-merged, my icons added on top)

Co-authored-by: Mavis <Mavis@hkgood.dev>

OSGKeyboardExt/KeyboardViewController.swift

@@ -381,6 +381,13 @@ public final class KeyboardViewController: UIInputViewController {
             return
         }
 
+        // v0.3.0: detect the app context (code / email / chat / doc)
+        // *before* either path. The Flow session's polisher and the
+        // legacy handoff's polisher both read this from the App
+        // Group. Cheap (heuristic over ≤ 2 KB), safe to run every
+        // press of the mic.
+        detectAndStoreAppContext()
+
         if FlowSessionBridge.isSessionActive() {
             startFlowRecording()
         } else {
@@ -420,6 +427,22 @@ public final class KeyboardViewController: UIInputViewController {
         debug("startFlowRecording")
     }
 
+    /// v0.3.0: run the 3-fallback context detector on the text
+    /// already at the cursor and persist the result to the App
+    /// Group. Cheap (heuristic over ≤ 2 KB of preceding text) so
+    /// safe to run on every press of the mic; we deliberately
+    /// avoid hitting the App Group on every keystroke.
+    private func detectAndStoreAppContext() {
+        let preceding = textDocumentProxy.documentContextBeforeInput
+        let store = AppGroupStore()
+        let detector = AppContextDetector()
+        let context = detector.detect(
+            precedingText: preceding,
+            storedCache: store.detectedAppContext
+        )
+        store.setDetectedAppContext(context)
+    }
+
     private func startUtteranceCountdown() {
         utteranceStartedAt = Date().timeIntervalSince1970
         state.utteranceRemainingSeconds = Int(FlowSessionKeys.maxUtteranceDuration)