Fix minor issues

[xboxones1]

1. Fixes Font resets to default (Normal) after exit and restart #12140
2. Fixes Font of the TOTP text in preview panel is too small #12743
3. Styles: drop Windows-specific palette overrides
   Pure white (#FFFFFF) on Windows makes the light theme look too harsh and uncomfortable. The softer light‑gray palette used on other platforms provides a more pleasant and balanced appearance. For the dark theme, essentially nothing changes, since it was already using the same colors as on other platforms, except for the window state colors
   Before:
   
   After:
   
4. Fixed the encoding of EditEntryWidgetMain.ui (was using Windows encoding)
5. Fixes Tab tab stop width is only 1 space. #12774

Testing strategy

Manually

Type of change

• ✅ Bug fix (non-breaking change that fixes an issue)

[droidmonkey]

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