feat(creator-studio): switch writing editor to TinyMCE

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

assets/creator-studio/build/index.css

@@ -1 +1 @@
-.jio-page-submit{background:#fafbfa}body.jio-page-submit.has-static-nav,body.jio-page-submit.nav-fixed{padding-top:0!important}.jio-page-submit .float-btn,.jio-page-submit .footer,.jio-page-submit .footer-tabbar,.jio-page-submit .header,.jio-page-submit .jio-float-buttons{display:none!important}.jio-page-submit #main-content.container{max-width:none;padding:0}#jio-creator-studio.is-ready{display:block}.jio-creator{--jc-ink:#243330;--jc-ink-soft:#5c6b66;--jc-paper:#fafbfa;--jc-line:#e2e9e5;--jc-accent:#267665;--jc-accent-strong:#1d5f52;--jc-warn:#b4573f;--jc-bar:60px;-webkit-font-smoothing:antialiased;background:var(--jc-paper);color:var(--jc-ink);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Noto Sans SC,PingFang SC,Microsoft YaHei,sans-serif;min-height:100vh;min-height:100dvh;padding-top:var(--jc-bar)}.jio-creator *,.jio-creator :after,.jio-creator :before{box-sizing:border-box}.jio-creator 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