fix: plugin card source badge blocked by hover overlay (#1802)

* Initial plan

* Add View Source menu item and remove clickable source badges

- Add "viewSource" translation key to all language files
- Add View Source menu item to plugin card dropdown (only for GitHub/marketplace plugins)
- Remove onClick handlers and ExternalLink icons from source badges
- Keep the badges themselves for visual indication of plugin source

Co-authored-by: RockChinQ <45992437+RockChinQ@users.noreply.github.com>

* Fix prettier formatting issue in PluginCardComponent

Co-authored-by: RockChinQ <45992437+RockChinQ@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: RockChinQ <45992437+RockChinQ@users.noreply.github.com>

web/src/i18n/locales/ja-JP.ts

@@ -283,6 +283,7 @@ const jaJP = {
     saveConfigError: '設定の保存に失敗しました：',
     config: '設定',
     readme: 'ドキュメント',
+    viewSource: 'ソースを表示',
     loadingReadme: 'ドキュメントを読み込み中...',
     noReadme: 'このプラグインはREADMEドキュメントを提供していません',
     fileUpload: {