fix: enable tmux mouse mode and update gitignore for split layout

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

dev-dashboard/.gitignore

@@ -1,3 +1,9 @@
 node_modules/
-public/dist/
 bun.lock
+backend/node_modules/
+backend/bun.lock
+frontend/node_modules/
+frontend/bun.lock
+frontend/dist/
+frontend/.vite/
+public/

dev-dashboard/backend/src/terminal.ts

@@ -61,6 +61,7 @@ export async function attach(
 
   const cmd = [
     `tmux new-session -d -s "${gName}" -t "${tmuxSession}"`,
+    `tmux set-option -t "${gName}" mouse on`,
     `tmux select-window -t "${gName}:${windowTarget}"`,
     `stty rows ${rows} cols ${cols}`,
     `exec tmux attach-session -t "${gName}"`,