fix(tui): abort the resume scan with its overlay

Review findings from ds-review-bot: closing the loading picker now
aborts the scan through the AbortSignal both query methods accept, a
signal-ignoring backend's late settlement is dropped by a staleness
check, one catch spans listing and projection so a projection failure
closes the overlay instead of stranding the loading placeholder,
setCandidates clears a stale still-loading error, and the batch
comment no longer overstates the win as scaling with session count.

packages/ui/tui/src/components/dialogs.ts

@@ -574,6 +574,8 @@ export class ResumePicker implements Component, Focusable {
   setCandidates(candidates: readonly ResumeCandidate[]): void {
     this.candidates = candidates
     this.selectedIndex = 0
+    // A still-loading error is false the moment rows exist.
+    this.error = ''
     this.invalidate()
   }