When in chat mode, the shell access and plan mode buttons should not be
visible. These buttons are only relevant in agent mode where the AI can
use shell commands and planning features.
Changes:
- Modified applyModeToToggles() to hide bash-toggle-btn and plan-toggle-btn
when mode is 'chat'
- Added immediate hiding on page load to prevent flash of buttons
- Buttons are shown again when switching to agent mode
Fixes#3411
Co-authored-by: michaelxer <michaelxer@users.noreply.github.com>