Rows whose only half is a folder in <HERMES_HOME>/desktop-plugins (no agent
package behind it) get the same trash button + destructive confirm as the
agent rows. The renderer names the FOLDER, never a path; Electron
(`hermes:plugin:removeDesktop` -> desktop-plugin-remove.ts) resolves it under
the app-level root, refuses anything that is not a single contained segment,
refuses unified-package halves (the reconcile would re-copy them; the agent
uninstall prunes them), removes a symlinked folder as the link, and deletes
the tree. The loader then retires the entry (unload, drop rows, stop watch)
so the pane/commands vanish without waiting for the next scan.
Why an IPC: these plugins have no agent half, so `plugins.manage remove` on
the gateway cannot reach them — they live on this computer, in every
connection mode.
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