Bring the ASCII, Windows 95 and light themes up to date with the
webapp changes since the last theme refresh:
- Flatten/bevel the new Telegram notifications banner icon badge.
- Square off the premium-server and referral-tariff dropdown help
pills and bevel the standalone referral surfaces (win95).
- Fix the selected-language check vanishing on the highlighted row
(black on ASCII, inverted bitmap on win95).
- Square the login-screen language trigger and render flag emoji
monochrome in the ASCII console palette.
- Add a soft drop shadow to the banner on the light theme.
Bump assets_version for all three CSS themes and update the theme
config tests accordingly.
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