feat: enhance custom font upload with WebView rendering, WOFF/WOFF2 support, preview & deletion

- Fix core bug: custom fonts now actually render in article WebView via
  @font-face injection and Jaguar local server font serving route
- Also fix built-in fonts (OpenSans/Roboto/SourceSerif) not rendering in WebView
- Add WOFF/WOFF2 format support for font upload
- Add font preview text in font picker and selected font indicator
- Add custom font deletion UI with confirmation dialog
- Add font file size validation (1KB-50MB)
- Update CSP to allow font-src from local server
- Add missing i18n translations for all 9 locales (zh, de, es, fr, hr, pt, tr, uk)
- Update Android build configuration and dependencies

Merge pull request #108 from yang991178/1.0.4

1.0.4

add tr locale

update dependencies

Merge pull request #68 from yang991178/1.0.3

Version 1.0.3

update dependencies

update packages and use uri for http

Merge pull request #12 from yang991178/1.0.1

Version 1.0.1

add service import through uri scheme

add unread sources only option

use jaguar to serve resources

add splash screens

switch to third party webview

initial commit