Taller popup on Firefox: roughly three more AI provider rows now fit on screen at once without scrolling. Also tightened the header text so the "no data" count is never truncated.

Single user-facing fix: the popup was 520px wide and cut off the widget's
header text and last filter tab. Bumped to 760x600 (Chrome's popup ceiling
is 800x600, leaving a 40px right gutter) so the full header
("CONDITION GREEN, ALL MONITORS, hh:mm:ss TZ") and all six filter chips
fit without ellipsis. At 760px the widget also clears its own 720
breakpoint and shows the Detail column alongside the sparkline.

Files changed:
- extension/popup.html (4 width values: 520 -> 760, plus iframe height
560 -> 600, plus updated comment)
- extension/manifest.json (version 1.0.2 -> 1.0.3; everything else
identical to the 1.0.2 baseline)

No permission changes. No host_permissions changes. No new APIs touched.