OpenIcon gallery: all 370 icons on /openicon, with search, filters and terminal glyphs (#199)

Replaces the 47-icon sample with the whole reference set: search by name,
alias or keyword; category chips with counts; UI/brand filter; SVG,
Nerd Font, Unicode or ASCII view (the Nerd Font view uses the official
symbols subset to the set's 349 glyphs, 38 KB woff2, MIT); size and
colour; a detail panel with all three glyphs and codepoints, trademark
notes, copy SVG / <img> / icon("key"), and downloads. Ready for the
optional HQ (full-colour) style: a Simple/HQ toggle appears once icons
carry an hq field. Filters live in the URL.

Co-authored-by: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

apps/logicsrc-web/public/openicon/set/svg/messenger.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="currentColor"><title>Messenger</title><g transform="translate(2 2) scale(0.83333)"><path d="M12 0C5.24 0 0 4.952 0 11.64c0 3.499 1.434 6.521 3.769 8.61a.96.96 0 0 1 .323.683l.065 2.135a.96.96 0 0 0 1.347.85l2.381-1.053a.96.96 0 0 1 .641-.046A13 13 0 0 0 12 23.28c6.76 0 12-4.952 12-11.64S18.76 0 12 0m6.806 7.44c.522-.03.971.567.63 1.094l-4.178 6.457a.707.707 0 0 1-.977.208l-3.87-2.504a.44.44 0 0 0-.49.007l-4.363 3.01c-.637.438-1.415-.317-.995-.966l4.179-6.457a.706.706 0 0 1 .977-.21l3.87 2.505c.15.097.344.094.491-.007l4.362-3.008a.7.7 0 0 1 .364-.13"/></g></svg>