* Refactor GitHub work-item mutations onto a shared optimistic coordinator
- Extract PR/issue status, assignee, reviewer, and merge/auto-merge mutations
out of TaskPage cell components into a registry-backed
begin/confirm/rollback pipeline (task-page-github-work-item-mutation-*),
so soft-hide, sticky filter-membership, and quiet revalidation behave
consistently across all mutation types instead of each cell re-implementing
optimistic update/rollback/toast logic.
- Add quiet revalidation (no filter skeleton, no page blanking) and soft-hide
handling so a row that exits the active filter (e.g. closing an issue under
`is:open`) stays hidden without a jarring list reflow.
- Restyle the GitHub task table: opaque sticky ID/Title cells, distinct header
fill, accent hover, and tighter row/toolbar chrome to fix background bleed
and muddy contrast in the scrolled table.
* Fix quiet-revalidate cancellation and sticky-hide scoping in TaskPage
- Replace per-render `cancelled` flag with a ref that only flips on
true unmount, so a nonce-triggered re-render no longer strands the
shared quietState's trailing/backoff bookkeeping mid-flight.
- Fix backoff index to use max lag attempts instead of lagging-key
count, matching processTaskPageQuietRevalidateSettle so several
single-lag items can't jump the delay tier.
- Scope sticky-hide retention in materializeTaskPageItemList to the
originating query key, preventing non-membership confirms (e.g.
auto-merge) from lingering as stale rows across refetches.
* Fix is:draft filter to soft-hide non-draft PRs
Previously state was forced to 'open' for is:draft queries, so a PR
that stopped being a draft still passed the state check and stayed
visible. Add an explicit draft check to soft-hide it.
* Improve GitHub work-item mutations with scoped quiet revalidation
Prevent race conditions and stale data by tracking quiet run ownership,
validating scope changes with generations, and blocking overlapping mutations
with pre-flight checks. Extract quiet state management into a dedicated module
with improved authority clearing and network retry logic.
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