Fix TUI fullscreen mode cutting off Claude Code status line

Add bottom padding to terminal containers so FitAddon proposes one
fewer row, leaving visible space below Claude Code's mode indicator.
Previously the bottom status line (e.g. "bypass permissions on") was
clipped against the container edge in fullscreen TUI mode.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

app/src/components/terminal/TerminalView.tsx

@@ -449,7 +449,7 @@ export default function TerminalView({ sessionId, active }: Props) {
       <div
         ref={containerRef}
         className="w-full h-full"
-        style={{ padding: "8px" }}
+        style={{ padding: "8px 8px 20px 8px" }}
       />
     </div>
   );