Add light mode that follows the device setting

Dark stays the default. A device set to light gets the picks from the
light motif board: the Dawn chart sky (dawn wash over faint star chart
lines, atlas marks in the hero), deep gold line seals, Midnight, violet and
gold dust, the deep gold to teal filament and the morning sky placeholder.
Large standalone seals (404, Inquiries, Inquiry sent, the blog's lead) are
gold foil in both modes.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012aSbo2D1qP8cMFQCykf7kx

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