## Summary
Repair the mock-backed desktop smoke fixtures blocking release PR #7817.
No application unread logic, styling, audio component, scheduler, or
release-tool changes.
- Require an exact channel-scoped kind-9 subscription before injecting
unread messages, including after navigation. The old readiness check
could accept a global-only, wrong-channel, or wrong-kind consumer. The
extracted predicate is used by the real mock bridge and has regression
coverage for those false positives and legacy behavior.
- Seed the 24 audio messages offscreen with distinct timestamps, then
open the channel with all cards in the load margin. Same-second random
event IDs previously reordered the settling timeline, causing different
visible cards to start loads. This was viewport churn, not a component
restart defect.
- Expose the existing real audio scheduler snapshot through the E2E
bridge. Assert 3 active / 21 queued before navigation and 0 active / 0
queued afterward. Preserve the peak-3 cap, exact 3 fetches /
cancellations / releases, zero object URLs, and existing unread/bold
assertions. No sleeps, retries, skipped tests, or relaxed limits were
added.
## Validation
- Before commit, all 30 tests in `channel-activity-popover.spec.ts`,
`channel-mute.spec.ts`, and `voice-note.spec.ts` passed five repetitions
with retries disabled: **150/150**. This was the working repair on base
`312cf674f`, before final formatting/cleanup, not the entire smoke
suite.
- At committed head `1b126afbe75c2a2afbdfe13744f0938fa584764e`, normal
pre-push hooks passed: **6,591/6,591 desktop unit tests**, desktop
checks, TypeScript typechecking, differential file-size gate, and
branch-skew check. Pre-commit Biome formatting passed; working tree is
clean.
- Independent sidebar and audio reviews found no substantive blocker.
Their formatting findings are resolved in this commit.
- Full repository `just ci`, native release packaging, and the entire
Playwright smoke suite were not run locally. GitHub CI is the remaining
broader gate; this PR is not a release certification.
## Release follow-up
After this repair is merged and required checks pass, regenerate #7817
through the desktop release tooling and validate the new candidate's
exact head. This PR does not merge or publish a release.
Originating discussion:
buzz://message?channel=3428ec3f-a58b-429b-afbc-dc6a77918ce8&id=3303565b14334696e9bbf433ef3ad1aea4307acc69834f7f685a412e81354493
Signed-off-by: Carl <32a2e2c9d428ee08902cab75d956da2c1d235a22d4766b0dd4138bf6e2e5db1d@buzz.block.builderlab.xyz>
Co-authored-by: Carl <32a2e2c9d428ee08902cab75d956da2c1d235a22d4766b0dd4138bf6e2e5db1d@buzz.block.builderlab.xyz>
