fix: center theme toggle emojis for better visual alignment

[NotYuSheng]

Summary

Fixed visual alignment issues with the sun ☀️ and moon 🌙 emojis in the theme toggle switch to ensure they are properly centered within their respective sections of the toggle.

Changes Made

• Sun Emoji (Light Mode):

  • Adjusted positioning from left: 8px to left: 6px
  • Added flexbox centering with display: flex, align-items: center, justify-content: center
  • Set explicit dimensions: width: 20px, height: 20px
  • Reduced font size from 14px to 12px for better proportions
  • Added line-height: 1 for consistent vertical alignment

• Moon Emoji (Dark Mode):

  • Adjusted positioning from left: 38px to left: 34px to center within right section

Technical Details

The previous implementation relied only on left positioning and translateY(-50%), which didn't account for emoji glyph variations and baseline differences. The new approach uses:

• Flexbox for perfect centering regardless of emoji rendering differences
• Explicit container dimensions for consistent spacing
• Optimized font size for better visual balance within the 32px toggle height

Test Plan

• Verify sun emoji centers properly in light mode
• Verify moon emoji centers properly in dark mode
• Check smooth transition between states
• Test across different browsers/devices for emoji rendering consistency

Visual Impact

Both emojis now appear perfectly centered within their respective toggle sections, improving the overall polish and professional appearance of the theme switcher.

🤖 Generated with Claude Code

[gemini-code-assist]

Summary of Changes

Hello @NotYuSheng, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses visual alignment issues with the sun and moon emojis within the theme toggle switch. The changes ensure that both emojis are perfectly centered within their respective sections, significantly improving the overall polish and professional appearance of the theme switcher component.

Highlights

• Improved Sun Emoji Alignment in Light Mode: The sun emoji (light mode) positioning was fine-tuned by adjusting its 'left' property from 8px to 6px. To ensure robust centering regardless of emoji rendering variations, flexbox properties (display: flex, align-items: center, justify-content: center) were added. Explicit dimensions (width: 20px, height: 20px) and a line-height of 1 were set, and the font size was reduced from 14px to 12px for better visual proportion.
• Adjusted Moon Emoji Alignment in Dark Mode: The moon emoji (dark mode) 'left' positioning was adjusted from 38px to 34px. This change helps to properly center the moon emoji within its designated section of the theme toggle, enhancing visual balance.

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[gemini-code-assist]

Code Review

This pull request effectively resolves the visual alignment of emojis in the theme toggle switch. By introducing flexbox for centering and adjusting positioning, the changes in frontend/src/MeetingTranscriptionApp.css provide a more robust and visually polished solution. The implementation is clean, well-reasoned, and directly addresses the issue. The code looks good, and I have no further recommendations.