Add CvS Failure heatmap view to per-cell display

[bracyw]

Description

The BMS per-cell heatmap currently supports three views via dropdown: Voltage, Temperature, and Balancing. Add a fourth "CvS Failure" view that subscribes to the BMS/PerCell/{chip}/{segment}/CvS/{cell} MQTT topic path. Unlike Balancing (blue/yellow), this view uses red for true (failure) and green for false (no failure), giving the team quick visibility into cell-vs-sense failures on the heatmap.

Acceptance Criteria

• A "CvS Failure" option appears in both the per-segment and all-segments view selector dropdowns
• Selecting CvS Failure displays YES/NO per cell on the hex tile heatmap
• True (failure) renders red, false (no failure) renders green
• CvS data is sourced from BMS/PerCell/Alpha/{segment}/CvS/{cell} and BMS/PerCell/Beta/{segment}/CvS/{cell} topics
• CvS failure state is visible in the cell-view detail dialog when a cell is clicked

Proposed Solution

Follow the existing Balancing implementation end-to-end, with a different color scheme:

1. Add alphaCvs/betaCvs topic functions in src/utils/topic.utils.ts, following the alphaBurning/betaBurning pattern
2. Add CvS cell count arrays (allAlphaCvsValues, allBetaCvsValues) — likely same counts as burn
3. Add CvsFailure to the HeatMapView enum in src/services/heat-map.service.ts
4. Extend CellReading in src/services/cell.service.ts with a cvs boolean field, subscribe to the new topics
5. Handle HeatMapView.CvsFailure in segment-heatmap.component.ts getCellValue, getCellBoolValue, and getColor — use red for true, green for false
6. Add CvsFailure entries to VIEW_CLASS_MAP and VIEW_UNIT_MAP in hex-tile.component.ts, add view-cvs-failure CSS class
7. Add the CvS Failure dropdown option in segment-row.component.ts, bms-segment-view.component.ts, and bms-debug-page.component.ts
8. Add CvS Failure row to the cell-view detail dialog

Test by running ng test and verifying the heatmap renders correctly with the new dropdown option.