Add measurement tools preference with measuring tape and angle tool overlays - Add "Enable Measurement Tools" checkbox to the Preferences dialog (TrackLabPreferencesModel + TrackLabPreferencesNode) - Add i18n strings for the new preference (EN + FR) - Add measurement tool state to SimModel: visibility flags and pixel-space position properties for both tools (tapPoint1/2, angleVertex/Arm1/Arm2) - Create MeasuringTapeNode: two draggable endpoints connected by a yellow dashed tape line; midpoint label shows real-world distance via MVT - Create AngleToolNode: vertex + two arm endpoints with a purple arc and degree label showing the interior angle - Create MeasurementToolsPanel: compact toggle panel (tape icon + angle icon checkboxes) positioned above the Info button, shown only when the preference is enabled - Wire everything into SimScreenView with DerivedProperty visibility guards (video must be loaded before overlays appear) https://claude.ai/code/session_019Lr1B4c4bUbQ4HgiZxG4Mb - #46