feat(web): prominent agent launcher (FAB, Ctrl/Cmd+J, sidebar entry, quick goals)

- Bottom-right FAB (56px, prism ring) with active-run count, pulse and latest
  status summary; turns into "collapse" beside the open drawer; hidden on the
  Agent page and while the mini dock shows; lifts above bottom floating bars
- Ctrl/Cmd+J toggles the drawer, Esc closes; input is focused on open
- Emphasized Agent entry at the top of the sidebar (expanded and collapsed)
  with active-run count; header button kept only below xl
- Drawer first screen offers 3 page-aware quick goals that fill the input
- Respects reduced motion; AgentShortcutsHelp exported for the settings page

Co-Authored-By: Claude Opus 5.5 <[email protected]>

apps/web/app/components/agent/quick-goals.test.ts

@@ -0,0 +1,13 @@
+import { describe, expect, it } from "vitest";
+import { quickGoalsFor } from "./quick-goals.ts";
+
+describe("抽屉快捷目标", () => {
+  it("按页面给 3 个相关目标", () => {
+    expect(quickGoalsFor("/console/library/abc")[0]).toBe("检查这部作品缺什么版本");
+    expect(quickGoalsFor("/console/sites/hdsky")[0]).toBe("从这个站找 ");
+    expect(quickGoalsFor("/console/tasks/t1")[0]).toBe("看看为什么没进展");
+    for (const p of ["/console", "/console/library", "/console/files", "/nope"]) {
+      expect(quickGoalsFor(p)).toHaveLength(3);
+    }
+  });
+});