Batch 4: Housekeeping — audio path, overnight refresh, CC theme, reader modal

[tinkerwise]

Closes #25

Summary

Four small targeted fixes from the site review:

• Audio path in easter-eggs.js uses a BASE constant instead of a hardcoded absolute path
• Auto-refresh skips API calls between midnight and 9am
• City Connect Friday auto-theme only applies when the user has no stored preference
• Reader modal styles use CSS variables so they respect dark/light/CC themes

Files changed

• src/scripts/easter-eggs.js — BASE constant for audio path
• src/scripts/app.js — getHours() < 9 guard on refresh interval
• src/scripts/theme.js — CC Friday only when !prefs.theme
• public/style.css — reader modal uses var(--surface), var(--text), var(--border)

Test plan

• Orioles Magic audio plays (if you can trigger the easter egg)
• Verify no API calls fire between midnight–9am (check Network tab on a timer tick)
• Set theme to Dark, wait for Friday (or mock date) — Dark theme should hold, not switch to CC
• Open reader modal in dark mode — panel should be dark, not a white flash

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