Color picker makes the PWA window unfocusable

[RainbowC0]

Preflight Checklist

• I agree to follow the Code of Conduct that this project adheres to.
• I have searched the issue tracker for a feature request that matches the one I want to file, without success.

Describe the bug
When using the color picker, the picker window will get the focus and make the main window lose the focus. When the picker window is closed, the main window cannot be restored.

To Reproduce
Steps to reproduce the behavior:

1. open the PWA application
2. set the fill color, line color, text color, etc;
3. click pick color to open the picker window;
4. click the main window, and the focus cannot be obtained;
5. press ESC to close the picker window, but the main window focus cannot be obtained still.

Expected behavior
Clicking the main window when the picker window is open will directly close the picker window and make the main window get focus; The main window should get focus after the picker window is closed in any way.

Screenshots
Always unfocusable

draw.io version (In the Help->About menu of the draw.io editor):

• draw.io version 30.3.6

Desktop (please complete the following information):

• OS: Windows 11
• Browser: edge
• Browser Version: 150.0.4078.48

I tested the problem in incognito/private mode with all browser extensions switched off, write "yes" below:

• yes

[draw-io-triage-bot]

👋 Thank you for opening this issue!

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Summary: When using the native color picker in the draw.io PWA on Windows, the color picker dialog steals focus from the main application window, and after the picker is closed, the main PWA window cannot regain focus, effectively becoming stuck in an unfocusable state.

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📝 Additional Information Needed

To help us investigate this more effectively, could you please provide:

• screenshots: The user mentions 'Always unfocusable' under screenshots but no actual screenshot or screen recording is attached. A video demonstrating the focus issue would help developers reproduce and understand the exact behavior.

We also have some questions:

• Is this issue specific to the PWA (installed Progressive Web App) version of draw.io, or does it also occur when using draw.io in a regular browser tab?
• When you say the main window 'cannot be restored,' do you mean it remains visually behind other windows and clicking on it has no effect, or does it appear in the foreground but keyboard/mouse input doesn't register?
• Does Alt+Tab or clicking the draw.io icon in the Windows taskbar restore focus to the main window?
• Can you confirm whether this issue also occurs with Chromium-based browsers other than Edge (e.g., Chrome), since the PWA behavior may be browser-dependent?

📋 Bug Report Template

**Environment:**
- draw.io version: [e.g., web app / desktop 24.x.x / Confluence plugin]
- Browser (if web): [e.g., Chrome 120, Firefox 121]
- OS: [e.g., Windows 11, macOS 14, Ubuntu 22.04]

**Steps to Reproduce:**
1. Go to ...
2. Click on ...
3. See error

**Expected Behavior:**
What you expected to happen.

**Actual Behavior:**
What actually happened.

**Screenshots/Files:**
If applicable, add screenshots or attach the .drawio file.

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_{🤖 This is an automated response to help with initial triage. A human maintainer will review this issue. If you've provided all the requested information, no further action is needed - we'll get back to you soon!}