feat: Dan Mode v2 — no grey anywhere, maximum neon
- Override --pico-box-shadow (had grey rgba values) with pure magenta/yellow glow
- Article/card: white bg, magenta border, yellow+magenta box-shadow
- Inputs/selects: yellow bg, magenta border, blue text (!important to beat Pico specificity)
- Dropdown: yellow bg, magenta border
- Footer: yellow bg, magenta border, red text
- Sharp corners (--pico-border-radius: 0) for brutalist aesthetic
- Hotkey hint: magenta
- Nav hover: red
- Header: yellow + red drop-shadow
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