fix: Toolbar export .refs shows global toast via window event, App.tsx listens for muse:toast

feat: add Export .refs to toolbar dropdown; implement full CSS variable theming with 3 themes and Settings controls

cleanup: remove grid toggle from floating toolbar; grid is now controlled from Settings

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feat: add drag handle before title in toolbar, grid toggle in toolbar, verify drag region on starter hub

fix: Toolbar reads boardTitle from store (shared state), rename/save/export all use same title

feat: Toolbar uses project_save/project_create for proper multi-project file management

fix: toolbar z-index drops below browser panel when browser is open - prevents accidental hover trigger

feat: Toolbar - add board dropdown menu (export, open saved, close project) + editable title with ChevronDown

fix: toolbar uses Globe/FolderOpen icons for browser/library, text formatting uses AlignLeft/Center/Right/Bold/Italic/Underline icons, hover adds to board directly"

refactor: Toolbar + LibraryPanel + SettingsPanel + BrowserPanel for board-first UI