- Created useCodexCommonConfig hook for managing Codex TOML common config
- Persists to localStorage with key 'cc-switch:codex-common-config-snippet'
- Added isCodexTemplateModalOpen state to ProviderForm
- Connected all CodexConfigEditor props:
- Common config snippet management (useCommonConfig, handlers)
- Template modal state (isTemplateModalOpen, setIsTemplateModalOpen)
- Form field callbacks (onWebsiteUrlChange, onNameChange)
- Custom mode detection (isCustomMode)
- Hook structure mirrors useCommonConfigSnippet for consistency
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