Home opens with the "Since you were here" digest above the timeline, as its own Server-Timing phase

Later: It changes home, which many open pulls touch, and the repository is flow only until the #5930 alarms stay clear.

The second half of #5797.

Done:

[ ] Signed in, / draws digest(...) above the timeline from the events the feed already read (no second scan), each line with §5's row(), under a heading that says "last 24 h"; nothing is drawn when it is empty.
[ ] The digest is its own Server-Timing phase digest. test/front-door-timing.test.ts ("the signed-in home names its session, reads and render and a cold feed read") is updated to expect it: that is the test changing because a phase was added, and the pull says so.
[ ] bun scripts/design-lint.ts passes.

Before pushing: bun x tsc --noEmit, bun test test/front-door-timing.test.ts test/home-digest.test.ts, and the design lint.

Home opens with the "Since you were here" digest above the timeline, as its own Server-Timing phase #6556