Add URL Inspector tool

[vuon9]

Summary

• add URL Inspector route/sidebar entry
• parse pasted absolute URLs into scheme, host, path, hash, and editable query rows
• rebuild/copy URLs with sorted and encoded/decoded query param controls
• add focused helper coverage for parse/build/sort/error behavior

Closes #104.

Verification

• npm run test -- src/pages/UrlInspector/urlUtils.test.js
• npm run test
• npm run build
• curl -I http://127.0.0.1:5173/tool/url-inspector

[vuon9]

Local verification passed:

• npm run test -- src/pages/UrlInspector/urlUtils.test.js
• npm run test
• npm run build
• curl -I http://127.0.0.1:5173/tool/url-inspector -> HTTP 200

CI Build is currently blocked before frontend jobs by missing Linux Wails GTK/WebKit pkg-config deps:

• Package 'gtk+-3.0' not found
• Package 'webkit2gtk-4.1' not found