test(unread): prevent startup catch-up in receipt reserve journey - #2274

* commit '05fba2455':
  feat(agents): show each session's system prompt and dividers in activity (#1855)
  feat(bestie): hourly check-ins from your Bestie (#2037)
  Authorize local apps to use Buzz MCP tools (#2211)
  feat(bestie): choose the private channels Bestie can read (#2036)
  Polish message actions, spacing, and membership notices (#2258)
  test(unread): prevent startup catch-up in receipt reserve journey (#2274)
  test(search): wait for rejected join clearance to settle (#2278)
  test(reactions): provide stable emoji media for icon rendering (#2279)
  feat(profiles): reserve profile room for an open channel's roster (#2269)

Signed-off-by: Daniel Rouleau <[email protected]>
Co-authored-by: Codex <[email protected]>

# Conflicts:
#	src/bundled/codex/runtime.ts

…ection

* origin/main: (39 commits)
  Authorize local apps to use Buzz MCP tools (block#2211)
  feat(bestie): choose the private channels Bestie can read (block#2036)
  Polish message actions, spacing, and membership notices (block#2258)
  test(unread): prevent startup catch-up in receipt reserve journey (block#2274)
  test(search): wait for rejected join clearance to settle (block#2278)
  test(reactions): provide stable emoji media for icon rendering (block#2279)
  feat(profiles): reserve profile room for an open channel's roster (block#2269)
  feat(host): harden byte lifecycle and add protected image upload (block#2199)
  Updated onboarding (block#2183)
  perf(relay): read each signed roster once in large channels (block#2244)
  AIDA-2346: Keep spoilers hidden in reminder previews (block#2261)
  fix: AIDA-2371 Keep sidebar selection pill aligned during resize (block#2182)
  fix(relay): skip background rereads of profiles a read found absent (block#2147)
  fix: prevent startup logo selection (block#1823)
  fix(agents): send sign-in evidence with agent Git credentials (block#2240)
  perf(mentions): stop scanning every member on each mention keystroke (block#2246)
  fix(attachments): send image dimensions so previews don't shift (block#2262)
  feat(shortcuts): add Slack-style hotkeys (block#2170)
  perf(plugins): share host request clients across calls (block#2243)
  fix(identity): keep federated sessions and agent grants in one keychain item (block#2225)
  ...

# Conflicts:
#	src/features/messages/ThreadPanel.tsx

…ock#2274)

The receipt reserve journey can let startup focus earn the real 300 ms
bottom catch-up before it records its individual receipt. The failed
WebKit trace already contains `activity:Alpha = 1700000119`, so the
unread owner correctly skips the redundant message frontier and the test
times out before applying pressure.

Move the existing `holdReadingFocus` call before initial navigation. It
now prevents automatic catch-up during startup and reload. Product code,
pressure volume, publication checks, durable reserve assertions, and
reload assertions are unchanged. No browser cases added or removed; this
existing case covers real app reading, IndexedDB persistence, and
reload.

Validation:

- Failed main: `10900108b4b18919eb50f687c6731cb827ef5297`, [run
41676688487](https://github.com/block/buzz-app/actions/runs/41676688487),
WebKit job 126059918324. Shard: 69 passed, 1 failed; 543.9 s wall,
1031.2 s summed execution. Failing case: 29.8 s; slowest case: 38.2 s.
- macOS WebKit at the failed SHA: unmodified case passed once (33.9 s).
A diagnostic variant explicitly waited for bottom catch-up before the
original observation and reproduced the same missing-frontier failure
(16.7 s).
- With the repair, a temporary diagnostic advanced the browser clock by
1 second after open; the entire affected case passed in Chromium (47.8
s) and WebKit (35.8 s). Diagnostic code is excluded from this PR. These
local runs are not hosted timing comparisons.
- Final head `497d3015b6ba4d59789ef7dc6400478c04eff836`: affected case
passed twice in WebKit (34.1/34.4 s) and twice in Chromium with an
isolated output directory (43.8/44.4 s). Command: `bin/pnpm test:browser
tests/browser/unread.spec.mjs --project chromium --no-deps --workers=1
--grep "a viewport receipt survives" --repeat-each=2 --output
<isolated-directory>`; preceding WebKit selection used the same case
filter and repeat count.
- An overlapping reviewer invocation initially deleted a Chromium
repetition's trace output during teardown, producing ENOENT for
trace/ZIP files after its assertions completed. That failed run is
excluded from passing evidence; the isolated Chromium repetitions passed
afterward.
- Only the affected test ran locally. [Hosted CI
41681273087](https://github.com/block/buzz-app/actions/runs/41681273087)
passed at the final head; `CI required` completed successfully at
2026-11-03 17:22:03 UTC. All 23 browser journey shards and
changed-journey repetition jobs in both engines passed. Independent
review approved with no findings; minimalness, elegance, and correctness
each scored 10/10.

Draft; no human/native acceptance observed. Native behavior is
unchanged.

Signed-off-by: Kalvin Chau <[email protected]>
Co-authored-by: am <6e30cd56c30e030cd31bb0939b94a7c257c9a09d5ba2d92cf2735da45629f248@buzz.block.builderlab.xyz>