fix(generator): match markdown typography between list and zoomed-in modal views

The zoomed-in post modal (opened with Enter/click) used #modal-content to
display post HTML, but the CSS typography rules (.post-text p/ul/ol/li margin
and padding) only targeted the .post-text class used in the list view. This
caused visually different formatting — missing paragraph spacing and unindented
lists — in the expanded modal compared to the feed.

Fix: extend all .post-text typography selectors in nav.tmpl to also cover
#modal-content, so both views apply identical spacing rules.

Also adds a missing spaceage theme sound preset to satisfy the
TestThemeSoundPresetsMatchRegistry test that was already failing.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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