Bug: plugins tab shows raw file:// paths for local plugins

[kostyaha]

Problem

In the app status popover Plugins tab, local plugins are shown as full file://... URLs. Long entries get truncated, so it is hard to identify which plugin is loaded.

Expected

Show friendly plugin names for local plugins (similar to TUI parsing), while still allowing access to the full raw specifier when needed.

Repro

1. Add a local plugin from .opencode/plugins or ~/.config/opencode/plugins.
2. Open app status popover -> Plugins.
3. Observe plugin row shows raw file:// path instead of a friendly name.

[github-actions]

This issue appears to be a unique problem specific to how local plugins are displayed in the app status popover Plugins tab.

While there is a related issue #8759 about file:// plugins with the same filename being incorrectly deduplicated, that's a different problem focused on plugin loading logic rather than UI display.

This request for showing friendly plugin names (similar to TUI parsing) for local file:// paths is a distinct UX improvement.