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_localizations_en.dart

@@ -2042,7 +2042,7 @@ class AppLocalizationsEn extends AppLocalizations {
 
   @override
   String get 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.';
+      '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.)';
 
   @override
   String get approvalsNoDataConfirmTitle => 'Approve without review data?';
@@ -2064,7 +2064,40 @@ class AppLocalizationsEn extends AppLocalizations {
 
   @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.';
+      '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.';
+
+  @override
+  String get approvalsRejectDialogHelp =>
+      'Rejecting stops the process at this step and is recorded with your reason in the audit trail.';
+
+  @override
+  String get approvalsRejectReasonHelper =>
+      'Required — recorded in the audit log.';
+
+  @override
+  String get approvalsBatchNoDataTitle => 'Approve without review data?';
+
+  @override
+  String approvalsBatchNoDataBody(num count, Object total) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other:
+          '$count of $total selected approvals have no review data. You are approving them without a detail view.',
+      one:
+          '1 of $total selected approvals has no review data. You are approving it without a detail view.',
+    );
+    return '$_temp0';
+  }
+
+  @override
+  String get approvalsCopyRun => 'Copy run id';
+
+  @override
+  String get approvalsRunCopied => 'Run id copied';
+
+  @override
+  String get approvalsUnknownReviewer => '(unknown)';
 
   @override
   String get approvalsOriginLabel => 'ORIGIN';
@@ -2094,7 +2127,7 @@ class AppLocalizationsEn extends AppLocalizations {
   String get approvalsRejectDialogTitle => 'Reject approval';
 
   @override
-  String get approvalsRejectReasonLabel => 'Reason (recorded in audit log)';
+  String get approvalsRejectReasonLabel => 'Reason';
 
   @override
   String approvalsApprovedToast(String flow, String step) {
@@ -2133,7 +2166,7 @@ class AppLocalizationsEn extends AppLocalizations {
   String get approvalsDialogReason => 'reason';
 
   @override
-  String get approvalsDialogPrompt => 'PROMPT';
+  String get approvalsDialogPrompt => 'QUESTION';
 
   @override
   String approvalsExpiresIn(int minutes) {