Add settings panel to customize which feature blocks are displayed in the full-screen info panel.
- Add settings dropdown for toggling visibility of action buttons, info tags, custom tags, layout controls, draggable image, and prompt tabs
- Persist user preferences to backend via globalStore
- Add i18n support for all block names (EN, ZH, DE)
- Rename change.log.md to CHANGELOG.md following industry standards
- Add panel settings screenshot to documentation
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