feat(frontend): Update brand identity with new logo and color scheme.

- Add new Logo component with gradient design (blue #0b74de to cyan #06b6d4)
- Replace CreditCard icon with custom Logo in sidebar
- Update primary and secondary theme colors to match brand gradient
- Regenerate all PWA icons with new logo design
- Update theme colors in PWA manifest and meta tags
- Fix ESLint config to ignore generated PWA files

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

Co-Authored-By: Claude <noreply@anthropic.com>

frontend/eslint.config.js

@@ -6,7 +6,7 @@ import tseslint from "typescript-eslint";
 import { globalIgnores } from "eslint/config";
 
 export default tseslint.config([
-  globalIgnores(["dist"]),
+  globalIgnores(["dist", "dev-dist"]),
   {
     files: ["**/*.{ts,tsx}"],
     extends: [