fix(dashboard): drop terminated-state leftovers and AgentListModal duplicate Resume

Removes no-op `agents.filter((a) => true)` calls (a leftover from the
terminated AgentState refactor) flagged by eslint and updates affected
tests and fixtures so `terminated` is no longer referenced. Also:

- Deletes the duplicate `state === "paused"` render branch in
  AgentListModal list view that produced two "Resume" buttons.
- Updates the AgentDetailView help text to reflect the current
  deletable states ("idle or paused").
- Aligns the bundled-plugin-install test with the new auto-load
  behavior for already-installed enabled plugins.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

packages/cli/src/plugins/__tests__/bundled-plugin-install.test.ts

@@ -221,7 +221,7 @@ describe("ensureBundledDependencyGraphPluginInstalled", () => {
     expect(result).toBe("already-installed");
     expect(store.updatePlugin).not.toHaveBeenCalled();
     expect(store.registerPlugin).not.toHaveBeenCalled();
-    expect(loader.loadPlugin).not.toHaveBeenCalled();
+    expect(loader.loadPlugin).toHaveBeenCalledWith(BUNDLED_PLUGIN_ID);
   });
 
   it("already installed with stale path → updates path to current bundled path", async () => {