feat(tui): QA fixes + approval Ctrl keys, workflow focus, session UUID

- gate session-list nav on idle so in-session arrows/jk don't move the list (5a)
- approval dismiss on esc + in-session 'a' reopens a pending approval (5b)
- auto-focus a newly started workflow session (was running invisibly)
- approval actions on Ctrl chords (^a/^r/^x) matching the modal; bare/Alt letters no longer approve; diff closes on ^x/esc
- steer hint in the approval modal; session UUID in the input bar
- env-gated debug logging (CORREX_TUI_LOG) with k.Alt in the key trace

apps/tui-go/internal/app/model.go

@@ -147,8 +147,9 @@ type Model struct {
 	savedBuffer  string
 
 	// flow flags
-	sessionEntered    bool
-	approvalDismissed bool
+	sessionEntered        bool
+	approvalDismissed     bool
+	pendingWorkflowFocus  bool
 
 	// router transcript
 	routerMessages  map[string][]RouterEntry