feat(plugins): add contextual action menus to plugin catalog (#602)

[annukumar123]

Summary

Adds contextual action menus for individual items in the plugin catalog for issue #602.

Key Changes

• Context Action Menu (⋮): Integrated an interactive options menu trigger on each plugin item.
• Context Actions:
  • Select & Run: Directly selects the plugin workspace.
  • Copy Details: Copies formatted plugin metadata (Name (ID): Description) to the clipboard with temporary success feedback.
• UX Protections: Added global event listeners (click and Escape key) to automatically close open context menus when interacting elsewhere.
• Unit Tests: Added test coverage for opening action menus, menu selection actions, and item interaction in PluginsPanel.test.jsx.

Closes #602

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