feat(web): wire AI feature view against AIStore

- Add apps/web/src/features/ai/AI.tsx: session sidebar, messages/suggestions/notes tabs, full CRUD against @pubscript/ai AIStore
- Route the /ai page to the new AI view; remove the static stub
- Add @pubscript/ai workspace dependency to apps/web
- Typecheck (7 packages) and tests (71 AI + 13 web) pass

apps/web/src/routes/AI.tsx

@@ -1,32 +1,5 @@
-import { Button, Input, toast } from "@pubscript/ui";
+import { AI as AIView } from "../features/ai/AI.js";
 
 export function AI() {
-  return (
-    <div className="ps-content">
-      <h1 style={{ margin: "0 0 16px", fontSize: 24 }}>AI Assistant</h1>
-      <p className="ps-settings-desc" style={{ marginBottom: 20 }}>
-        Local-first AI: prompts run against your configured provider. Nothing leaves your machine unless you allow it.
-      </p>
-
-      <Input
-        label="Prompt"
-        placeholder="Summarize Mara's arc so far…"
-        style={{ width: "100%", marginBottom: 12 }}
-      />
-      <div style={{ display: "flex", gap: 10 }}>
-        <Button variant="primary" onClick={() => toast.success("Prompt queued locally.")}>Run locally</Button>
-        <Button variant="secondary">Refine character</Button>
-        <Button variant="secondary">Outline next chapter</Button>
-      </div>
-
-      <div style={{ marginTop: 24, padding: 16, background: "var(--ps-surface)", border: "1px solid var(--ps-border)", borderRadius: 8 }}>
-        <h3 style={{ marginTop: 0, fontSize: 14 }}>Privacy</h3>
-        <ul style={{ margin: 0, paddingLeft: 18, lineHeight: 1.8, fontSize: 14 }}>
-          <li>Documents are never uploaded without explicit consent.</li>
-          <li>Context is chunked to stay within the token budget.</li>
-          <li>Session history is stored locally and deletable.</li>
-        </ul>
-      </div>
-    </div>
-  );
+  return <AIView />;
 }