docs(applications): distinguish UI date defect from backend safeguards

docs/ui-modernisation/UNAPPLIED_DATE_PRESERVATION.md

@@ -6,6 +6,8 @@ The backend `JobApplication.DateApplied` contract explicitly preserves null befo
 
 The converter now leaves missing/invalid values empty. The existing save path submits null. Valid legacy timestamp conversion is unchanged and remains a separately tracked precision/timezone question. No data migration, backend API or status transition changed.
 
+Static backend follow-through: `JobApplicationsController.Update` calls `JobLifecycleEvents.SyncAppliedDateWithHistory`, and `JobPipeline.SyncAppliedDate` already clears Applied dates for prospect stages. This guards stored Saved dates independently of the UI. The reproduced defect is the fabricated form value and outgoing request; corrupted stored dates or analytics were not reproduced. The lifecycle wrapper can record a cleared-date event when it receives a fabricated value. Its runtime event behaviour was not exercised by these intercepted browser checks.
+
 ## Evidence
 
 - RED: three cases (null, empty, invalid) failed against the original converter; seven existing calendar cases passed.

docs/ui-modernisation/UNAPPLIED_DATE_SOURCE_MANIFEST.json

@@ -1,5 +1,5 @@
 {
-  "sourceContentCommit": "138f1ee69c2a1c2f3e039cc1219f53465afb59ef",
+  "sourceContentCommit": "e6240ad309bb1c73fb9110c954ca81e7dea74440",
   "policy": "LF-normalised source and text evidence; raw PNG/gzip/zip/export. Content binding for offline UI verification; release candidate/image identity remains separate.",
   "sources": {
     "job-tracker-ui/src/App.tsx": "e0c50ec92954b90cf62b9d8b8e0d5b5802c2408e577e5e255a8d78c3dfdf7135",
@@ -59,7 +59,7 @@
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     "docs/ui-modernisation/evidence/unapplied-date/unapplied-Pacific-Kiritimati-nb-390-dark.png": "562b3eff0c3c93b194a3a76a475333e4757a91a7a9ccfd72c102a4517b47d8dd",
     "docs/ui-modernisation/evidence/unapplied-date/unapplied-Pacific-Kiritimati-nb-768-light.png": "ba295e1e5b29d01255b93cc1dcb2d13384d3a68679a55a0161d30ca915f11445",
-    "docs/ui-modernisation/UNAPPLIED_DATE_PRESERVATION.md": "1aa3cd34175889f2f9b0582419cc2e2d713b3f86e4e337ad0288c99485626476"
+    "docs/ui-modernisation/UNAPPLIED_DATE_PRESERVATION.md": "dd04881faa2bc40d95246b076f346aa4cc529ae0605d3daf77f10b435d5e45ae"
   },
   "export": {
     "job-tracker-ui/out/404.html": "ba829bcc2bc317a0b5bb331fc50c56435dd905ccb6302c3877ca1d065999393b",