Add one-click format functionality for JSON editors with toast notifications:
- Add format button to JsonEditor (CodeMirror)
- Add format button to CodexAuthSection (auth.json)
- Add format button to CommonConfigEditor (settings + modal)
- Add formatJSON utility function
- Add i18n keys: format, formatSuccess, formatError
Note: TOML formatting was intentionally NOT added to avoid losing comments
during parse/stringify operations. TOML validation remains available via
the existing useCodexTomlValidation hook.
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