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/en-US.ts

@@ -282,6 +282,7 @@ const enUS = {
     saveConfigError: 'Configuration save failed: ',
     config: 'Configuration',
     readme: 'Documentation',
+    viewSource: 'View Source',
     loadingReadme: 'Loading documentation...',
     noReadme: 'This plugin does not provide README documentation',
     fileUpload: {