* i18n: add Czech (cs) interface translation
Translate the 1,246-entry interface catalog clean-room from the English source labels (cross-referenced with PdfCraft, VectorCraft, and PhotoCraft Czech catalogs) and register Czech (Čeština) for system locale detection and persisted selection. Add tests for Czech locale resolution, full catalog key parity, count-neutral word count formatting, and bundled UI font glyph coverage for Czech diacritics.
# Conflicts:
# ROADMAP.md
* Czech: translate interface strings added on main since this PR
Adds 221 Czech entries so cs.tsv again has the full zh-hans key set
(2,021 entries) and drops the stale "Wildcards (regex)" row; updates the
documented entry count.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Co-authored-by: Brandon Thomas <echelon@gmail.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Co-authored-by: Brandon Thomas <brandon@storyteller.ai>
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