fix(freelancer-edit): save sends the hash and uses PATCH

The save was authorised by the record id alone — ids are small
sequential integers, publicly visible on every directory card, so
a PATCH carrying only an id let one visitor overwrite another's
listing. The save now:

- uses PATCH (C.saveMethod), matching n8n
- carries the hash in the body under the same "has" key the
  delete already sends, so save and delete share one credential
  path, alongside the record id
- refuses to fire at all when the page holds no hash, and says why
  in the status line

Everything else is unchanged: the 15-point gate, receipt only on
2xx, the honest failure line that keeps the edits, the save.disabled
handling and the DELETE shape.

freelancer-edit/index.html

@@ -164,9 +164,11 @@
         hashKeys: ["has", "hash"],
         // Wire name used OUTWARD on the GET query string.
         hashWireKey: "has",
-        // SAVE: POST with the record id — the admin path's convention (POST with an id =
-        // update an existing record). Match this method in the n8n workflow.
-        saveMethod: "POST",
+        // SAVE: PATCH the existing record, carrying BOTH the hash (the credential, same key
+        // the delete already sends) and the record id. An id alone authorises nothing: record
+        // ids are small sequential integers, publicly visible on every directory card, so a
+        // request without the hash is refused before it is sent. Match this method in n8n.
+        saveMethod: "PATCH",
         // DELETE: unverified. A route that refuses it (404/405/501) is a clear failure and
         // this page never reports success on a non-2xx. Match this method in the workflow.
         deleteMethod: "DELETE",
@@ -566,12 +568,22 @@
               focusTotalLine.setAttribute("data-bad", "1");
               return;
             }
+            // A save is authorised by the HASH, not by the id. If this page holds no hash there
+            // is nothing to prove ownership, so the request is not fired at all — a PATCH
+            // carrying only an id is exactly the hole this closes. Say why, do not fail silently.
+            if (!hash) {
+              line.className = "status state-err";
+              line.textContent = "This link arrived without its code, so we cannot save your " +
+                "changes. Open it again from the email that brought you here.";
+              return;
+            }
             save.disabled = true;
             line.className = "status";
             line.textContent = "Saving…";
-            // The body shape: the record's id + every field this form owns. SAVE_METHOD is
-            // C.saveMethod ("POST", the admin path's convention).
-            var payload = { id: rec && rec.id !== undefined ? rec.id : undefined };
+            // The body shape: the credential (the SAME "has" key the delete sends, one
+            // credential path for both) + the record's id + every field this form owns.
+            // Method is C.saveMethod ("PATCH").
+            var payload = { has: hash, id: rec && rec.id !== undefined ? rec.id : undefined };
             payload.Name = document.getElementById("edName").value.trim();
             payload.Focus = document.getElementById("edFocus").value.trim();
             payload.description = document.getElementById("edDescription").value.trim();