feat(relays): clearer relay health UI + fix broken relay operations

Relay tab improvements so users can see which relays to remove:
- Per-relay status pill: Online (with ping) / Offline / Checking… / Blocked.
- Insecure remote ws:// relays (CSP-blocked) flagged immediately with a hint.
- Offline relays show a "consider removing" hint; their Remove button is
  emphasized.
- Summary banner when relays are down (incl. the all-dead case explaining why
  videos won't load), pointing at Restore defaults / healthy relays.

Also fixes a pre-existing decomposition bug (commit 7300977a): handleRelayOperation
called this.runRelayOperation, but that method lives on the main
ProfileModalController — so ALL relay ops (add/remove/mode/restore) threw
"this.runRelayOperation is not a function". Route via this.mainController.

Tests: relay-insecure-url (isInsecureRelayUrl), relay-operation-routing (routes to
mainController.runRelayOperation, guards no-pubkey). Both mutation-verified.
Build + lint + full unit suite green.

Co-Authored-By: Claude Opus 4.8 <[email protected]>

components/profile-modal.html

@@ -720,6 +720,12 @@
                   <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M21 12a9 9 0 0 0-9-9 9.75 9.75 0 0 0-6.74 2.74L3 8"></path><path d="M3 3v5h5"></path><path d="M3 12a9 9 0 0 0 9 9 9.75 9.75 0 0 0 6.74-2.74L21 16"></path><path d="M16 21h5v-5"></path></svg>
                 </button>
               </div>
+              <div
+                id="relayHealthSuggestion"
+                class="hidden card border border-status-warning/40 bg-status-warning/10 p-3 text-xs text-text"
+                role="status"
+                aria-live="polite"
+              ></div>
               <ul id="relayList" class="grid-stack" data-orientation="vertical"></ul>
               <div class="space-y-2 px-1">
                 <label