chore: Enhance type safety and improve code consistency across components

- Added a new `typecheck` script in `package.json` for better type checking in the UI workspace.
- Refactored several components to remove unnecessary type assertions and improve type safety, particularly in `new-project-modal.tsx`, `edit-project-dialog.tsx`, and `task-progress-panel.tsx`.
- Updated event handling in `git-diff-panel.tsx` to use async functions for better error handling.
- Improved type definitions in various files, including `setup-view` and `electron.ts`, to ensure consistent usage of types across the codebase.
- Cleaned up global type definitions for better clarity and maintainability.

These changes aim to streamline the development process and reduce potential runtime errors.

apps/ui/src/store/app-store.ts

@@ -153,8 +153,12 @@ export function getStoredTheme(): ThemeMode | null {
   try {
     const legacy = getItem('automaker-storage');
     if (!legacy) return null;
-    const parsed = JSON.parse(legacy) as { state?: { theme?: unknown } } | { theme?: unknown };
-    const theme = (parsed as any)?.state?.theme ?? (parsed as any)?.theme;
+    interface LegacyStorageFormat {
+      state?: { theme?: string };
+      theme?: string;
+    }
+    const parsed = JSON.parse(legacy) as LegacyStorageFormat;
+    const theme = parsed.state?.theme ?? parsed.theme;
     if (typeof theme === 'string' && theme.length > 0) {
       return theme as ThemeMode;
     }