feat(binary-studio): SVG control-flow graph view

Closes #99

Summary Follow-up to #105 / #99: adds an interactive CFG panel to Binary Studio. ## What’s new - layoutCfg / cfgToSvg — layered BB layout + SVG edges - Workspace panel synced with the active function; click a node to jump hex/disasm - Unit tests for layout + PE-derived blocks ## Validation cd src/binary-studio npm test # 3 files, 13 passed npm run build ## Notes - Still static analysis only (no emulator) - Graph is a simple layered layout, not a full IDA/Ghidra graph engine