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.dart

@@ -3521,7 +3521,7 @@ abstract class AppLocalizations {
   /// No description provided for @approvalsNoPayload.
   ///
   /// In en, this message translates to:
-  /// **'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.)'**
   String get approvalsNoPayload;
 
   /// No description provided for @approvalsNoDataConfirmTitle.
@@ -3557,9 +3557,51 @@ abstract class AppLocalizations {
   /// No description provided for @approvalsIntroHelp.
   ///
   /// In en, this message translates to:
-  /// **'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.'**
   String get approvalsIntroHelp;
 
+  /// No description provided for @approvalsRejectDialogHelp.
+  ///
+  /// In en, this message translates to:
+  /// **'Rejecting stops the process at this step and is recorded with your reason in the audit trail.'**
+  String get approvalsRejectDialogHelp;
+
+  /// No description provided for @approvalsRejectReasonHelper.
+  ///
+  /// In en, this message translates to:
+  /// **'Required — recorded in the audit log.'**
+  String get approvalsRejectReasonHelper;
+
+  /// No description provided for @approvalsBatchNoDataTitle.
+  ///
+  /// In en, this message translates to:
+  /// **'Approve without review data?'**
+  String get approvalsBatchNoDataTitle;
+
+  /// No description provided for @approvalsBatchNoDataBody.
+  ///
+  /// In en, this message translates to:
+  /// **'{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.}}'**
+  String approvalsBatchNoDataBody(num count, Object total);
+
+  /// No description provided for @approvalsCopyRun.
+  ///
+  /// In en, this message translates to:
+  /// **'Copy run id'**
+  String get approvalsCopyRun;
+
+  /// No description provided for @approvalsRunCopied.
+  ///
+  /// In en, this message translates to:
+  /// **'Run id copied'**
+  String get approvalsRunCopied;
+
+  /// No description provided for @approvalsUnknownReviewer.
+  ///
+  /// In en, this message translates to:
+  /// **'(unknown)'**
+  String get approvalsUnknownReviewer;
+
   /// No description provided for @approvalsOriginLabel.
   ///
   /// In en, this message translates to:
@@ -3617,7 +3659,7 @@ abstract class AppLocalizations {
   /// No description provided for @approvalsRejectReasonLabel.
   ///
   /// In en, this message translates to:
-  /// **'Reason (recorded in audit log)'**
+  /// **'Reason'**
   String get approvalsRejectReasonLabel;
 
   /// No description provided for @approvalsApprovedToast.
@@ -3677,7 +3719,7 @@ abstract class AppLocalizations {
   /// No description provided for @approvalsDialogPrompt.
   ///
   /// In en, this message translates to:
-  /// **'PROMPT'**
+  /// **'QUESTION'**
   String get approvalsDialogPrompt;
 
   /// No description provided for @approvalsExpiresIn.