Fix BMS At A Glance stat overlap and clipping at narrow widths

Bug

The At A Glance strip on the BMS debug page does not degrade gracefully as the window narrows. Between roughly 768px and ~1200px the stat tiles collide instead of wrapping or shrinking:

• Adjacent values run together into one unreadable string (e.g. Pack Voltage and Average Temp render as "312.846.0" with the degree sign floating in the middle; CCL/DCL/High Voltage mash into "-126.0225.03.459").
• The Cell/Chip caption labels on High Voltage / Low Voltage / High Temp are clipped mid-word by the neighboring tile's battery icon ("Cell: 76 | Ch...").
• Below 768px the whole page is blank — tracked separately in #713.

Steps to reproduce

1. Open /bms with live data.
2. Narrow the window to ~800px.
3. Observe the At A Glance row.

Expected

Stats wrap to a second row, shrink, or truncate with ellipsis — never overlap.

Notes

Observed 2026-07-15 while screenshotting #712 (see that PR's earlier revision for an 800px capture); pre-existing on develop, unrelated to the Open Wire change.