OpenClaude-Portable Web Dashboard

## Environment
- OS: Ubuntu Linux
- Browser: Firefox / Chrome
- IME: fcitx5
- OpenClaude version: v0.9.2
- Provider: Google Gemini

## Bug Description
Japanese IME input does not work in the Web Dashboard chat input field.
Characters cannot be entered at all when using Japanese input (fcitx5).
English input works fine.

## Root Cause
In `dashboard/index.html` line 847, the Enter key handler does not check
`e.isComposing`, causing IME composition events to conflict with the send action.

**Before (buggy):**
```js
if (e.key === 'Enter' && !e.shiftKey) { e.preventDefault(); sendMessage(); }
```

**After (fixed):**
```js
if (e.key === 'Enter' && !e.shiftKey && !e.isComposing) { e.preventDefault(); sendMessage(); }
```

## Additional Notes
- Firefox does not work even after the fix; Chrome works correctly after the fix
- Browser cache must be cleared after applying the fix

## Workaround
Apply the fix above to `dashboard/index.html` and use Chrome browser.