fix(approvals): usertest-panel hardening (0.81.0)

Panel findings against the reworked approvals page, fixed in place:

- Never fabricate the request time: ApprovalRecord.createdAt is
  nullable now; a missing created_at omits the line instead of
  rendering DateTime.now() (which drifted on refresh). Guard:
  approvals_origin_test pins the omit-on-null invariant.
- Copyable errors on approve/reject/batch via showChainErrorSnack
  (the hard project rule) — batch surfaces the first real cause.
- Reject requires a reason: ChainInlineHelp strip + confirm disabled
  while empty, no more silent close-and-nothing-happens.
- Batch approve applies the same no-data confirmation as the single
  path, naming how many selected requests carry no show: data.
- Plainer language: glossary "Vorgang (Flow)", history label FRAGE
  (was PROMPT), no-data hint drops developer jargon.
- One-click copy of the run id; history payload pretty-prints like
  the card.

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

lib/l10n/app_en.arb

@@ -1113,13 +1113,20 @@
   "approvalsPillRejected": "rejected",
   "approvalsPillExpired": "expired",
   "approvalsPayloadPreview": "DATA TO REVIEW",
-  "approvalsNoPayload": "No data was attached for review. The flow's approval step chooses what to show via its \"show:\" field — set it to surface the data behind this decision.",
+  "approvalsNoPayload": "No data was attached to this approval. You are deciding without a detail view — when in doubt, ask whoever set up the process. (Technical: the approval step's \"show:\" field controls what appears here.)",
   "approvalsNoDataConfirmTitle": "Approve without review data?",
   "approvalsNoDataConfirmBody": "This flow deliberately attached no review data (no \"show:\" on its approval step). You can still approve — but you would be deciding without seeing the data behind this decision.",
   "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.",
+  "approvalsIntroHelp": "Paused processes (flows) waiting for your decision. Each card shows which process is holding at which step and what data it puts in front of you — Approve resumes it, Reject stops it with your reason.",
+  "approvalsRejectDialogHelp": "Rejecting stops the process at this step and is recorded with your reason in the audit trail.",
+  "approvalsRejectReasonHelper": "Required — recorded in the audit log.",
+  "approvalsBatchNoDataTitle": "Approve without review data?",
+  "approvalsBatchNoDataBody": "{count, plural, =1{1 of {total} selected approvals has no review data. You are approving it without a detail view.} other{{count} of {total} selected approvals have no review data. You are approving them without a detail view.}}",
+  "approvalsCopyRun": "Copy run id",
+  "approvalsRunCopied": "Run id copied",
+  "approvalsUnknownReviewer": "(unknown)",
   "approvalsOriginLabel": "ORIGIN",
   "approvalsOriginProject": "Project",
   "approvalsOriginRequested": "Requested",
@@ -1135,7 +1142,7 @@
   "approvalsApproveButton": "Approve",
   "approvalsRejectButton": "Reject",
   "approvalsRejectDialogTitle": "Reject approval",
-  "approvalsRejectReasonLabel": "Reason (recorded in audit log)",
+  "approvalsRejectReasonLabel": "Reason",
   "approvalsApprovedToast": "approved · {flow} › {step}",
   "@approvalsApprovedToast": {
     "placeholders": {
@@ -1179,7 +1186,7 @@
   "approvalsDialogDecided": "decided",
   "approvalsDialogCreated": "created",
   "approvalsDialogReason": "reason",
-  "approvalsDialogPrompt": "PROMPT",
+  "approvalsDialogPrompt": "QUESTION",
   "approvalsExpiresIn": "{minutes}m",
   "@approvalsExpiresIn": {
     "placeholders": {