Add workspaces, conversation sessions, app-managed computers and pictures

- Rail: Add icon with stacked form modals (bot, workspace, computer),
  coordinator, recent bots with "See all bots", Workspaces section, and
  a workspace mode listing only its crew
- Workspaces: page for context, bots (per-workspace instructions and
  memory), computers (default, link, unlink), models and delete;
  conversations scoped per bot per workspace
- Sessions: conversations split into searchable, reopenable sessions
  with carry-over summaries; sessions and new-session header icons
- Computers: created and provisioned over the docker socket, home dir
  kept at DATA_DIR/computers/<id> after delete; super admins only
- Models: workspace settings win over a bot's own, then the defaults
- Pictures for bots and workspaces; bots editable from the header
- Coordinator tools: update_workspace, set_bot_workspace_instructions

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

src/functions/backend/db/workspaces/remove-computer-from-workspace.ts

@@ -9,8 +9,9 @@ type Params = {
 };
 
 /**
- * Takes a computer off one of the user's workspaces. Its bots keep any
- * access they were given directly.
+ * Unlinks a computer from one of the user's workspaces; the computer
+ * itself stays. When it was the default, the oldest computer still linked
+ * takes over (none: the workspace has no computer).
  */
 export default async function removeComputerFromWorkspace({
     user_id,
@@ -27,4 +28,13 @@ export default async function removeComputerFromWorkspace({
         sql: `DELETE FROM workspace_computers WHERE workspace_id = ? AND computer_id = ?`,
         values: [workspace.id, computer_id],
     });
+
+    if (String(workspace.computer_id) == String(computer_id)) {
+        await BunSQLite.sql({
+            sql: `UPDATE workspaces SET updated_at = ?, computer_id = (
+                SELECT computer_id FROM workspace_computers WHERE workspace_id = ? ORDER BY id ASC LIMIT 1
+            ) WHERE id = ?`,
+            values: [Date.now(), workspace.id, workspace.id],
+        });
+    }
 }