Bash works on GitHub Actions; Fable tier checks fixed

What's changed

• Fixed feature flags being evaluated without the user's subscription tier when a session started with an expired login token, which could wrongly prompt Max plan users to enable usage credits for Fable
• Fixed every Bash command failing under claude-code-action with allowed_non_write_users on GitHub-hosted runners
• Fixed /tui bringing back a conversation that had been rewound to before its first message
• Improved slash-command menu: blue now marks only the selected row, matched characters are bolded instead of recolored, and emoji or accented names keep their glyphs
• Improved performance: fewer event-loop stalls on file-not-found suggestions and at-mention size checks