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_en.arb

@@ -1119,6 +1119,13 @@
   "approvalsNoDataConfirmAction": "Approve anyway",
   "approvalsRequestFallback": "Approval required for this step",
   "approvalsFlowStepMeta": "Flow: {flow} · Step: {step}",
+  "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.",
+  "approvalsOriginLabel": "ORIGIN",
+  "approvalsOriginProject": "Project",
+  "approvalsOriginRequested": "Requested",
+  "approvalsOriginRun": "Run",
+  "approvalsApproveTooltip": "Resumes the flow at this step",
+  "approvalsRejectTooltip": "Stops the flow — with your reason",
   "@approvalsFlowStepMeta": {
     "placeholders": {
       "flow": { "type": "String" },
@@ -1861,6 +1868,8 @@
   "runsHubTooOldTitle": "This view needs a newer hub version",
   "runsHubTooOldHint": "The hub is connected, but its version does not know the runs monitor yet. Update the hub and the runs will appear here.",
   "runsHubTooOldButton": "Open Doctor",
+  "runsHubUpdateButton": "Update hub now",
+  "runsHubUpdateStarted": "Updating hub…",
   "runsLoadFailedTitle": "Runs could not be loaded",
   "runsCancelButton": "Cancel",
   "runsCancelSignalled": "Cancel signalled for {flow}.",