Fix History tab crash: coerce Ivanti note fields to strings before rendering

PostgreSQL + Ivanti API enrichment can return non-string values
(objects/arrays) for currentStateUserNotes and similar fields.
React crashes silently (blank page, no console error) when trying
to render non-string values as children. Same root cause pattern
as Bug 3 in ivanti-panel-bugs-2026-05-12.

Added safeText() wrapper that coerces any non-string truthy value
to a JSON string before rendering in the History tab notes section.

Also fixed flaky property test: fc.date() could generate invalid
dates causing RangeError on .toISOString(). Added .filter() guard
and explicit UTC date bounds.

backend/__tests__/fp-submissions-cleanup.property.test.js

@@ -31,7 +31,9 @@ const lifecycleStatusArb = fc.constantFrom('submitted', 'approved', 'rejected',
 
 const dismissedAtArb = fc.oneof(
     fc.constant(null),
-    fc.date({ min: new Date('2020-01-01'), max: new Date('2030-12-31') }).map(d => d.toISOString())
+    fc.date({ min: new Date('2020-01-01T00:00:00.000Z'), max: new Date('2030-12-31T00:00:00.000Z') })
+        .filter(d => !isNaN(d.getTime()))
+        .map(d => d.toISOString())
 );
 
 const submissionArb = fc.record({

frontend/src/components/pages/ReportingPage.js

@@ -4087,11 +4087,16 @@ function FpEditModal({ open, onClose, submission, queueItems, onSuccess }) {
                         <div>
                             {/* Ivanti reviewer notes (rework/approval/previous state feedback) */}
                             {(() => {
+                                const safeText = (val) => {
+                                    if (!val) return null;
+                                    if (typeof val === 'string') return val;
+                                    try { return JSON.stringify(val); } catch { return String(val); }
+                                };
                                 const notes = [
-                                    submission.ivanti_rework_note && { label: 'Rework Note', text: submission.ivanti_rework_note },
-                                    submission.ivanti_approval_note && { label: 'Approval Note', text: submission.ivanti_approval_note },
-                                    submission.ivanti_current_state_notes && { label: 'Current State Notes', text: submission.ivanti_current_state_notes },
-                                    submission.ivanti_previous_state_notes && { label: 'Previous State Notes', text: submission.ivanti_previous_state_notes },
+                                    safeText(submission.ivanti_rework_note) && { label: 'Rework Note', text: safeText(submission.ivanti_rework_note) },
+                                    safeText(submission.ivanti_approval_note) && { label: 'Approval Note', text: safeText(submission.ivanti_approval_note) },
+                                    safeText(submission.ivanti_current_state_notes) && { label: 'Current State Notes', text: safeText(submission.ivanti_current_state_notes) },
+                                    safeText(submission.ivanti_previous_state_notes) && { label: 'Previous State Notes', text: safeText(submission.ivanti_previous_state_notes) },
                                 ].filter(Boolean);
                                 return notes.length > 0 ? notes.map((note, idx) => (
                                     <div key={idx} style={{