feat(approvals,runs): explain approvals in place + one-click hub update (0.81.0)

Approvals: the pending card now shows its full origin — flow, step,
run id (previously dropped at the Dart mapping layer), project, and
requested-at — under an ORIGIN heading, led by a one-line intro strip
that says what the inbox is and what Approve/Reject do. Approve/Reject
buttons carry tooltips; the history dialog gains project + run id.
Fixes the approvals doc drift (title/details/reviewer ->
prompt/show/timeout_seconds). Guard: approvals_origin_test renders the
card via the hermetic fake hub and pins every origin fact.

Runs: the "hub too old" state now leads with an in-place update button
(same `chain update apply` path as the Diagnose page), the Diagnose
deeplink demoted to secondary, with a CLI-absent fallback. Guard: two
new RunsLoadErrorView widget tests.

Signed-off-by: flemming-it <stefan.a.flemming@googlemail.com>

lib/l10n/app_localizations_en.dart

@@ -2062,6 +2062,28 @@ class AppLocalizationsEn extends AppLocalizations {
     return 'Flow: $flow · Step: $step';
   }
 
+  @override
+  String get approvalsIntroHelp =>
+      'Paused flows waiting for your decision. Each card shows which flow is holding at which step and what data it puts in front of you — Approve resumes the flow, Reject stops it with your reason.';
+
+  @override
+  String get approvalsOriginLabel => 'ORIGIN';
+
+  @override
+  String get approvalsOriginProject => 'Project';
+
+  @override
+  String get approvalsOriginRequested => 'Requested';
+
+  @override
+  String get approvalsOriginRun => 'Run';
+
+  @override
+  String get approvalsApproveTooltip => 'Resumes the flow at this step';
+
+  @override
+  String get approvalsRejectTooltip => 'Stops the flow — with your reason';
+
   @override
   String get approvalsApproveButton => 'Approve';
 
@@ -3357,6 +3379,12 @@ class AppLocalizationsEn extends AppLocalizations {
   @override
   String get runsHubTooOldButton => 'Open Doctor';
 
+  @override
+  String get runsHubUpdateButton => 'Update hub now';
+
+  @override
+  String get runsHubUpdateStarted => 'Updating hub…';
+
   @override
   String get runsLoadFailedTitle => 'Runs could not be loaded';