Fix session timeline query, bump to 0.2.1

getSessionTimeline() grouped/ordered by a bare `bucket` identifier,
assuming SQLite would resolve it against the SELECT list's alias -
it doesn't in this generated query, so every /sessions/:id page and
/api/stats/sessions/:id/timeline request failed with "no such column:
bucket". Fixed by reusing the actual bucket expression object in
groupBy/orderBy instead of referencing it by name. Verified against a
seeded session - previously every request, now correct bucketed data.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01W8WkFF5ppURBAB918593Eb

package.json

@@ -1,6 +1,6 @@
 {
   "name": "sexy",
-  "version": "0.2.0",
+  "version": "0.2.1",
   "private": true,
   "scripts": {
     "dev": "next dev",