sync(t3x): rebase 51 fork patches onto upstream 50871eb5d (46 commits)

[radroid]

Local resolution of the escalated daily sync (#33). The range — 46 upstream commits / 51 fork
patches — is larger than the 36/37 range that consumed 81% of the CI resolver's 45-minute budget,
so per docs/t3x/sync-agent-runbook.md this was resolved locally rather than via @claude resolve.

Conflicts resolved (4)

File	Upstream cause	Resolution
apps/web/src/routes/_chat.$environmentId.$threadId.tsx	pingdotgg#4830 gated <ChatView> behind a render-state check and removed the renderState !== "ready" early return	Kept the overlay a sibling of <ChatView> inside the conditional. Outside it, the overlay would newly render over a blank inset in loading/missing states — it previously could not, because the whole route returned null unless ready.
apps/desktop/src/main.ts	pingdotgg#4878 added an ElectronPowerMonitor import on the fork's import line	Both imports kept, alphabetical.
apps/web/src/components/settings/SettingsPanels.tsx	Upstream added backgroundActivity* to the restore-defaults object	All three entries kept.
packages/client-runtime/src/connection/supervisor.ts	pingdotgg#4903 (resetRetryState ladder reset) + pingdotgg#4878 (mobile probe/reconnect wakeups) both rewrote code the fork had restructured	Six regions merged: the fork's extracted runLivenessProbe now takes a probe-timeout arg (for MOBILE_CONNECTION_PROBE_TIMEOUT) and returns a third "reconnect" outcome for upstream's application-active-reconnect. The fork's tolerance state folded into upstream's resetRetryLadder() so every ladder reset clears it uniformly.

Semantic drift found by seam review (no conflict, no test failure)

Upstream pingdotgg#4830 disables sending while a thread's detail loads (sendDisabledReason: "Messages loading"). The fork's thread outbox is a parallel submit path upstream's guard doesn't reach:
onSend returns into handleQueueComposerSubmission() before the threadDetailLoading check, and
the Queue button was gated only on hasSendableContent. Both now observe the same gate (8b9f74968).

This is the class of bug a rebase cannot surface — neither file conflicted and all three verify
steps were already green. docs/t3x/SEAMS.md gains a "Parallel paths" table so the next sync checks
for it.

Verification

• vp run typecheck — exit 0
• vp run lint — exit 0, zero errors
• vp run test --testTimeout=120000 — exit 0, 0 failures
• 51/51 patches replayed, none dropped; 0 behind upstream
• Every one of the 34 seam files retains its fork delta

Landing

Do not use the merge button — this branch replaces main's history. Land with
git push --force-with-lease origin origin/t3x/sync-20260730:main. Rollback point:
af5a21316.

Closes #33

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