Fix annoying DM relay warning and clarify settings UI

- Throttle the "Privacy warning: direct messages are using your default relays..." message so it only appears once per session/identity change.
- Rename "DM Relay Hints" to "NIP-17 Relay List" in the DM Settings modal to match the warning message and reduce user confusion.
- Add regression test for the warning throttling logic.

Co-authored-by: PR0M3TH3AN <[email protected]>

components/dm-settings-modal.html

@@ -62,16 +62,16 @@
         <!-- Relay Hints -->
         <section class="space-y-4">
             <div class="space-y-1">
-                <h3 class="text-base font-semibold text-text">DM Relay Hints</h3>
+                <h3 class="text-base font-semibold text-text">NIP-17 Relay List</h3>
                 <p class="text-sm text-muted">
-                    Publish relay hints for direct messages as <span class="font-medium">kind:10050</span> events. Use WSS-only relay URLs so encrypted DM delivery stays secure.
+                    Publish your NIP-17 relay list for direct messages as <span class="font-medium">kind:10050</span> events. Use WSS-only relay URLs so encrypted DM delivery stays secure.
                 </p>
             </div>
 
             <div class="card p-5 space-y-5">
                 <div class="flex flex-col gap-3 sm:flex-row sm:items-end">
                     <label class="flex-1 text-sm text-muted-strong" for="dmSettingsRelayInput">
-                        <span class="mb-2 block font-medium">Add a DM relay</span>
+                        <span class="mb-2 block font-medium">Add a NIP-17 relay</span>
                         <input
                             id="dmSettingsRelayInput"
                             type="text"
@@ -91,13 +91,13 @@
                         <span class="text-xs font-medium text-muted-strong uppercase tracking-wider">Your list</span>
                      </div>
                      <ul id="dmSettingsRelayList" class="grid-stack space-y-2" data-orientation="vertical"></ul>
-                     <p id="dmSettingsRelayEmpty" class="text-sm text-muted italic hidden">No DM relay hints configured.</p>
+                     <p id="dmSettingsRelayEmpty" class="text-sm text-muted italic hidden">No NIP-17 relays configured.</p>
                 </div>
 
                 <div class="flex flex-wrap items-center justify-between gap-3 pt-2 border-t border-border/40">
                     <span id="dmSettingsRelayStatus" class="text-xs text-muted" role="status" aria-live="polite"></span>
                     <button id="dmSettingsRelayPublishBtn" type="button" class="btn-ghost focus-ring text-xs">
-                        Publish relay hints
+                        Publish relay list
                     </button>
                 </div>
             </div>