Eight identical 'call (WebRTC)' rows with no owner is the least useful thing
a monitor can print. Three changes:
- detail panes group processes by role with a plain-English gloss, a pid list,
and a judgement when a group looks abandoned ('11 of 14 idle for over 30
min, oldest 201.7h'). The hint states evidence and never says safe to delete,
because a muted call and a dead call both sit at zero.
- the tab list is one row per URL, duplicates summed with a count badge, each
row carrying the site's own favicon fetched through the local server and
cached on disk. Sites with no icon get a letter tile, never a third-party
icon service.
- Vitals' own cost is in the header, and its own tab is badged 'this screen'.
Tests caught a real bug while writing this: merge_tabs compared each tab to the
group running total, so the busiest tab could never name the row.
Co-developed-with: CLU
