feat(timer): Dynamic duration adjustment during active sessions

[Tonyyang0606]

Feature Description

Current timer UI for reference

New Functionality

• Adds support for real-time duration adjustments during an active session.
• Tapping Time Adjustment will reveal options like:
  • Increase 5 min
  • Decrease 5 min
  • Increase 1 min
  • Decrease 1 min
  • etc.
• Adjustments only apply to the current session , not future ones.

Compatibility

✔️ Works with these modes:

• normal timing / simple countdown

Notes

• UI/UX follows the existing timer design pattern.
• No impact on saved presets or future sessions.

[sonarqubecloud]

Quality Gate passed

Issues
2 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
1.0% Duplication on New Code

See analysis details on SonarQube Cloud

[RoderickQiu]

Thanks for your contribution!

After investigating about the code, I want to point out two things:

• If it doesn't work for positive timing mode, then I suggest that it should be hidden in that mode (methodFromStart===3 means positive timing in timer.html).
• I suggest that the comments in the code should use English, instead of Chinese.

After the two things are achieved, I will be glad to merge this PR!

P.S. Never mind about the failing checks, I believe they are malfunctioning as for now.

[Tonyyang0606]

Thanks for the review!
I’ve addressed both issues:

1. The feature is now hidden when methodFromStart === 3 (i.e., in positive timing mode).
2. All comments have been translated into English.
   Please let me know if there's anything else to improve. Looking forward to the merge!

[RoderickQiu]

Nice job!