Updated Participant search and delete. Filtered import.

frontend/src/pages/Participants.svelte

@@ -53,7 +53,8 @@
       .filter(p => {
         if (!s) return true
         return p.preferred_name?.toLowerCase().includes(s) ||
-               p.email?.toLowerCase().includes(s)
+               p.email?.toLowerCase().includes(s) ||
+               p.phone?.toLowerCase().includes(s)
       })
       .sort((a, b) => (a.preferred_name || a.email).localeCompare(b.preferred_name || b.email))
   })
@@ -177,6 +178,18 @@
     }
   }
 
+  async function deleteParticipant(id) {
+    if (!confirm('Permanently delete this participant and all their records?')) return
+    error = ''
+    try {
+      await api.participants.delete(id)
+      await db.participants.delete(id)
+      editId = null
+    } catch (err) {
+      error = err.message
+    }
+  }
+
   async function addTicket(e, participantId) {
     e.preventDefault()
     addingTicket = true; error = ''
@@ -327,6 +340,8 @@
                     <div class="actions" style="margin-top:0.5rem">
                       <button type="submit" class="btn btn-primary btn-sm" disabled={saving}>{saving ? 'Saving…' : 'Save'}</button>
                       <button type="button" class="btn btn-ghost btn-sm" onclick={() => editId = null}>Cancel</button>
+                      <span class="spacer"></span>
+                      <button type="button" class="btn btn-danger btn-sm" onclick={() => deleteParticipant(editId)}>Delete</button>
                     </div>
                   </form>
                 </td>