feat(chat): terminal chat parity for every tool; Desktop-like artifacts

- The chat over a terminal pane now covers Claude, Codex, omp, Cursor and
  Antigravity: Cursor's agent transcript and agy's step log
  (brain/<id>/.system_generated/logs/transcript_full.jsonl) are read as
  conversations; Cursor sessions are claimed by their workspace
- Replies appear as soon as they are written: the projects-tree watcher
  broadcasts `transcript_changed` (at most every 250 ms per session) and the
  chat re-reads the transcript while the terminal underneath draws
- Stop shows from the pane's own busy line (Claude/Codex `esc to interrupt`,
  agy `… esc to cancel`), or fresh output for omp/Cursor — no hooks needed
- Permission prompts read off the terminal become a card with the tool, its
  command and "Deny with a note"; Codex gets Permission mode / Model buttons
  that open its own numbered pickers, answered from the menu card
- Artifacts: cards for pages/documents/diagrams/tables/React components, a
  Preview | Code panel with versions, copy, download, save to the Artifacts
  Hub, full screen; sandboxed iframes without allow-same-origin
- Claude panes get CLAUDE_CODE_ENABLE_TODO_TOOLS=1 so the Progress panel has a
  plan; multi-question pane menus read their Next row and question tabs
- The realtime chat bridge (structured stdio, /api/chat-bridge, /ws-chat)
  from the unreleased ad9d475 is not kept

server/lib/cursor-usage.js

@@ -18,7 +18,11 @@
  *   is resolved only when exactly such a path still exists, else left empty.
  * A file is re-read when its mtime changes, and the mtime per file lives in
  * `cursor_transcripts`, so a session the user deleted stays deleted until
- * Cursor writes to it again. No transcript is ever stored as `transcript_path`.
+ * Cursor writes to it again. A session a dashboard pane started is claimed
+ * for that pane's workspace and run (`claimToolSessions`), which gives the
+ * pane its session id and so its Chat view. No transcript is ever stored as
+ * `transcript_path`; the conversation view finds the file through
+ * `transcriptPath` instead.
  * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
  */
 
@@ -26,6 +30,7 @@ const fs = require("node:fs");
 const os = require("node:os");
 const path = require("node:path");
 const { db, stmts } = require("../db");
+const { claimToolSessions } = require("./dashboard-runs");
 
 const ACTIVE_MS = 120_000; // the window codex-usage.js calls a session active
 const FUTURE_SLACK_MS = 1000;
@@ -148,6 +153,14 @@ function transcriptFilesIn(cursorDir) {
 }
 
 const getSeen = db.prepare("SELECT * FROM cursor_transcripts WHERE path = ?");
+const getPathOf = db.prepare(
+  "SELECT path FROM cursor_transcripts WHERE session_id = ? ORDER BY mtime_ms DESC LIMIT 1"
+);
+
+/** The transcript a Cursor session was read from (recorded by the poller), or null. */
+function transcriptPath(sessionId) {
+  return getPathOf.get(sessionId)?.path || null;
+}
 const upsertSeen = db.prepare(
   `INSERT INTO cursor_transcripts (path, session_id, mtime_ms, updated_at)
    VALUES (?, ?, ?, strftime('%Y-%m-%dT%H:%M:%fZ', 'now'))
@@ -235,6 +248,7 @@ function ingestCursorUsage({ broadcast = () => {}, now = Date.now() } = {}) {
         upsertSeen.run(f.path, f.id, f.mtime);
         if (type) {
           written += 1;
+          claimToolSessions(f.id); // its workspace and live pane, before the broadcast
           broadcast(type, stmts.getSession.get(f.id));
         }
       } catch (err) {
@@ -273,4 +287,5 @@ module.exports = {
   firstPrompt,
   ingestCursorUsage,
   startCursorUsagePoll,
+  transcriptPath,
 };