bimi: show declination hint only when DMARC is enforced

Only display the "Explicitly decline BIMI participation" hint when DMARC
policy is quarantine or reject, as BIMI requires strong DMARC enforcement
to be meaningful.

web/src/lib/components/BimiRecordDisplay.svelte

@@ -1,11 +1,16 @@
 <script lang="ts">
-    import type { BimiRecord } from "$lib/api/types.gen";
+    import type { BimiRecord, DmarcRecord } from "$lib/api/types.gen";
 
     interface Props {
         bimiRecord?: BimiRecord;
+        dmarcRecord?: DmarcRecord;
     }
 
-    let { bimiRecord }: Props = $props();
+    let { bimiRecord, dmarcRecord }: Props = $props();
+
+    const dmarcEnforced = $derived(
+        dmarcRecord?.policy === "quarantine" || dmarcRecord?.policy === "reject",
+    );
 </script>
 
 {#if bimiRecord}
@@ -72,7 +77,7 @@
                     {bimiRecord.error}
                 </div>
             {/if}
-            {#if !bimiRecord.valid}
+            {#if !bimiRecord.valid && dmarcEnforced}
                 <div class="alert alert-info mt-3 mb-0">
                     <h6 class="alert-heading">
                         <i class="bi bi-lightbulb me-1"></i>

web/src/lib/components/DnsRecordsCard.svelte

@@ -182,7 +182,7 @@
             />
 
             <!-- BIMI Record -->
-            <BimiRecordDisplay bimiRecord={dnsResults.bimi_record} />
+            <BimiRecordDisplay bimiRecord={dnsResults.bimi_record} dmarcRecord={dnsResults.dmarc_record} />
         {/if}
     </div>
 </div>