feat(macos): local ASR model manager, menu-bar polish, and release 0.5.2

Adds a bundled local ASR model catalog for the macOS app with one-click
Sherpa Qwen3 / SenseVoice downloads (pause/resume, inline actions) and a
shared model storage directory used by MLX Qwen3. Fixes the light-mode
sidebar material and makes the menu-bar icon follow the system appearance
with a refreshed status mark. Renames the built product to OSGKeyboard.app.

Bumps version to 0.5.2 (build 19).

OSGKeyboardMac/MacQwen3LocalASR.swift

@@ -12,7 +12,8 @@ enum MacQwen3LocalASR {
         samples: [Float],
         sampleRate: Int,
         locale: Locale,
-        modelPath: String
+        modelPath: String,
+        bias: LocalASRBiasPayload? = nil
     ) async throws -> String {
         guard MacLocalASRPreferences.qwen3ModelIsInstalled(at: modelPath) else {
             throw MacLocalASRError.qwen3ModelMissing
@@ -24,11 +25,14 @@ enum MacQwen3LocalASR {
         }
 
         let language = MacQwen3LanguageHint.from(locale: locale)
+        let context = bias?.promptBias?.trimmingCharacters(in: .whitespacesAndNewlines)
+        let promptContext = (context?.isEmpty == false) ? context : nil
         do {
             return try await MacQwen3ASREngine.shared.transcribe(
                 samples: samples,
                 language: language,
-                modelPath: modelPath
+                modelPath: modelPath,
+                context: promptContext
             )
         } catch let error as MacLocalASRError {
             throw error