chore(hardening): tighten security and footprint defaults

src/lib/types/app.ts

@@ -51,6 +51,7 @@ export interface SettingsState {
   llmModelId: LlmModelIdStr | null;
   llmPromptPreset: LlmPromptPreset;
   aiGpuConcurrency: AiGpuConcurrency;
+  prewarmModelOnStartup: boolean;
   saveAudio: boolean;
   outputFolder: string;
   globalHotkey: string;