feat: SettingsPanel storage tab - add .refs export/import with toast, data size stats, storage mode info

fix: SettingsPanel uses only existing commands, export works as JSON download, remove non-existent imports"

feat: wire theme selection in Settings Appearance tab with live preview cards

feat: fully functional Storage settings - live usage stats, clear library/projects, reveal folder, export .refs"

fix: redesign all Settings tabs with consistent visual system and uncropped content

fix: Settings canvas rows with proper grid/minimap toggles and non-compressed switches

feat: add Navigator/Minimap setting in Settings > General

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fix: import React type for SettingsPanel JSX types

feat: redesign settings panel and add Stronghold password vault UI

fix: SettingsPanel - merge browser privacy/shield settings, wire toggles to real Tauri state

refactor: SettingsPanel with general/appearance/shortcuts/storage/privacy/about tabs