Show all pack-level stats in a single At A Glance bar

[bracyw]

Description

The BMS page currently splits pack-level stats between the At A Glance bar (voltage, temp, charge, CCL, DCL) and three separate cards in a left column (High Voltage, Low Voltage, High Temp). The new design consolidates everything into one full-width bar so operators can scan all critical pack data in a single row.

Acceptance Criteria

• One full-width bar shows all 8 stats: Average Voltage, Average Temperature, Charge State, CCL, DCL, High Voltage, Low Voltage, High Temp
• High/Low Voltage and High Temp each identify which cell and chip the value belongs to
• The three separate stat card components and the left-column layout are removed
• All data updates in real time as before

Proposed Solution

Absorb the subscriptions from the three stat card components into bms-at-a-glance, add three new sections to the template, and remove the left-column grid tile from the page layout. Reference existing stat card components for subscription patterns.

Mocks