chore(tsconfig): ensure complete TypeScript coverage for all project files (#5655)

## Summary
- Added missing directories and files to tsconfig.json to ensure
complete TypeScript type checking coverage
- Expanded config file patterns to include all .mts configuration files
- Verified all 908 TypeScript files in the project are now properly
covered

## Changes
- Added `scripts/**/*.ts` to cover all TypeScript files in scripts
directory (i18n collection, CI/CD scripts)
- Added `build/**/*.ts` to cover customIconCollection.ts and future
build scripts
- Changed `vite.config.mts` to `*.config.mts` to include all vite config
files (vite.electron.config.mts, vite.types.config.mts)

## Test plan
- [x] Run `pnpm typecheck` to verify no TypeScript errors
- [x] Verified all TypeScript files are covered by tsconfig patterns
- [x] browser_tests/ directory confirmed to have its own extending
tsconfig

🤖 Generated with [Claude Code](https://claude.ai/code)

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-5655-chore-tsconfig-ensure-complete-TypeScript-coverage-for-all-project-files-2736d73d36508103acbadc53ca2b2913)
by [Unito](https://www.unito.io)

---------

Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Alexander Brown <drjkl@comfy.org>
Co-authored-by: filtered <176114999+webfiltered@users.noreply.github.com>

scripts/diff-i18n.ts

@@ -72,7 +72,7 @@ function capture(srcLocaleDir: string, tempBaseDir: string) {
     const relativePath = file.replace(srcLocaleDir, '')
     const targetPath = join(tempBaseDir, relativePath)
     ensureDir(dirname(targetPath))
-    writeFileSync(targetPath, readFileSync(file))
+    writeFileSync(targetPath, readFileSync(file, 'utf8'))
   }
   console.log('Captured current locale files to temp/base/')
 }