fix: add captureId to RefImage for reliable capture dedupe

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feat: add isHighlighter to AnnotationPath type for highlighter annotation mode

fix: types.ts - add sourceUrl to RefImage for tracking where image came from (SRS F-14)

refactor: replace src/ with board-first architecture - types, store, App.tsx adapted for Tauri

Remove old SolidJS frontend files (replaced by React prototype UI)

Revise browser UI layout and add Phase 2 shield foundation

Revise UI and implement Phase 1 browser tabs

Phase 0 MUSE alpha skeleton and SRS docs