- replace the ~100-option avatar <select>s in Add Relic / Add Light Cone with a searchable picker modal (keep-in-inventory card + avatar cards with element/path/level)
- warn when the chosen character already wears a relic in that slot or a light cone
- click+Confirm or double-click applies; Esc closes only the picker; search autofocused
- localize all new strings (th/en, other locales fall back to en) and refresh chips/picker on language change
- add AGENTS.md with localization and cache-busting rules
- bump app.js v3.20, styles.css v2.29, i18n.js v2.17 and align all i18n imports
CAtlas0784
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