feat: add theme state to store; apply data-theme to document; persist in localStorage

feat: add showGrid setting to store; persist grid/minimap canvas settings

feat: add showMinimap setting default off

fix: board image event listener registered once and dedupes by captureId/url

fix: dedupe board image add events by original/source/data URL

fix: listen for browser hover ADD events and add captured image to active canvas

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feat: store auto-save reports errors via global event; project load failures are logged

fix: move boardTitle into store so rename/save/auto-save all share the same title state end-to-end

feat: store uses project_load/project_save with activeProjectId for proper multi-project persistence

feat: add isHighlighter to store + highlighter button in annotation toolbar + register tab_autofill command

feat: store.tsx - add focusMode, valueMirrorIds, zoomLensActive state for SRS v2.0 innovations

refactor: store.tsx - board-first state management with Tauri persistence via invoke()