feat: add card catalog and filters

static/icons/stats/SOURCE.md

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+# Stat icon sources
+
+Retrieved from the stat display on HolodoriDB on 2026-08-17.
+
+- `performance.webp`: https://api.holodori.best/manual_assets/stat-performance.webp
+- `technique.webp`: https://api.holodori.best/manual_assets/stat-technique.webp
+- `sense.webp`: https://api.holodori.best/manual_assets/stat-sense.webp
+
+These assets are used by HolodoriDB as monochrome CSS mask images. Verify the
+original game asset rights and distribution terms before public deployment.

static/icons/types/SOURCE.md

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+# Type icon sources
+
+Retrieved from the card list on HolodoriDB on 2026-08-17.
+
+- `cute.webp`: https://api.holodori.best/manual_assets/attr-cute.webp
+- `pure.webp`: https://api.holodori.best/manual_assets/attr-pure.webp
+- `happy.webp`: https://api.holodori.best/manual_assets/attr-happy.webp
+
+The downloaded WebP files contain only a VP8L image-data chunk and no EXIF,
+XMP, ICC profile, comments, attribution strings, or embedded source URLs.
+Verify the original game asset rights and distribution terms before public
+deployment.