Add bot graphics

Bots can now show a concept as a visual: create_graphic (with
update_graphic, read_graphic and list_graphics, on every run, no computer
needed) stores one HTML document in bot_graphics, per user like the
conversation, and the chat renders its [graphic:ID] ref as an inline card
sized to fit, with a large view and a page of its own (no rail).

Graphic HTML is treated as hostile: it is only served at /graphics/<id>
with a CSP sandbox allowing scripts under an origin of its own and no
network, loading only the vendored Chart.js and Mermaid from
/graphics-lib/. The document carries the app's theme vars and scrollbars,
reports its height to the thread, and a frame that navigates away is
closed.

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

src/functions/backend/db/bots-queue/complete-bot-job.ts

@@ -110,6 +110,14 @@ export default async function completeBotJob({
             sql: `UPDATE token_usages SET message_id = ? WHERE job_id = ? AND message_id IS NULL`,
             values: [inserted.id, job.id],
         }).catch(() => {});
+
+        /**
+         * Graphics the run made belong to the message it posted.
+         */
+        await BunSQLite.sql({
+            sql: `UPDATE bot_graphics SET message_id = ? WHERE job_id = ? AND message_id IS NULL`,
+            values: [inserted.id, job.id],
+        }).catch(() => {});
     }
 
     /**