fix: make activity bar icon theme-aware

Rohan Satkarrequested to merge
Coderxrohan/gitlab-vscode-extension:fix/activity-bar-icon-theme-aware into main

Issue

The GitLab activity bar icon is invisible in some themes because the SVG uses a hard-coded fill color, which is ignored by VS Code.

Fix

Updated the activity bar SVG icon to use fill="currentColor" so VS Code can apply the appropriate theme color.

Impact

The GitLab activity bar icon is now visible and consistent across light and dark themes.

Verification

  • Ran the extension in Extension Development Host
  • Verified icon visibility in light and dark themes

Closes #2184 (closed)

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