feat(icons): split built-in sprite into per-icon SVG sources and add ticket icon

Move the 114 built-in sprite icons out of assets/js/runtime/svg-icon.js into
assets/icons/sprite/{key}.svg and generate svg-icon.js with
tools/build-svg-sprite.mjs. Add ticket-color and use it for the user center
ticket entry. Update sidebar contract tests for the creator card labels.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

assets/icons/sprite/right.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1024 1024"><path d="M294.4 908.8 684.8 512 294.4 115.2c-25.6-25.6-25.6-70.4 0-96 25.6-25.6 70.4-25.6 96 0L832 460.8c12.8 12.8 19.2 32 19.2 51.2S844.8 544 832 563.2l-441.6 441.6c-25.6 25.6-70.4 25.6-96 0C262.4 979.2 262.4 934.4 294.4 908.8z" p-id="1915" data-spm-anchor-id="a313x.7781069.0.i2"></path></svg>