chore(web): drop probe button and footer rail

The 15 s health poll stays; the manual trigger and the rtt/poll-note
footer earned nothing over it.

Closes #106

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

web/src/main.ts

@@ -98,8 +98,6 @@ function main() {
   const masterLamp = must<HTMLElement>("#master-lamp");
   const verdict = must<HTMLElement>("#master-verdict");
   const version = must<HTMLElement>("#version");
-  const roundtrip = must<HTMLElement>("#roundtrip");
-  const probeButton = must<HTMLButtonElement>("#probe");
 
   const master = moduleRefs("master");
   const checks = {
@@ -153,18 +151,16 @@ function main() {
       for (const name of ["tmdb", "prowlarr", "master"] as const) {
         setTrace(name, null);
       }
-      roundtrip.textContent = "rtt —";
       return;
     }
 
-    const { report, roundtripMs } = probe;
+    const { report } = probe;
     const degraded = report.status === "degraded";
 
     masterLamp.dataset.state = degraded ? "degraded" : "ok";
     verdict.dataset.tone = degraded ? "warn" : "ok";
     verdict.textContent = degraded ? "chain degraded" : "all signals nominal";
     version.textContent = `v${report.version}`;
-    roundtrip.textContent = `rtt ${roundtripMs} ms`;
 
     setModule(master, degraded ? "degraded" : "ok", degraded ? "warn" : "ok", report.status);
     setTrace("master", degraded ? "warn" : "ok");
@@ -192,16 +188,11 @@ function main() {
       return;
     }
     inFlight = true;
-    probeButton.disabled = true;
     render(await probeHealth());
-    probeButton.disabled = false;
     inFlight = false;
     refreshQueuesBadge?.();
   }
 
-  probeButton.addEventListener("click", () => {
-    void probe();
-  });
   window.setInterval(() => {
     void probe();
   }, POLL_MS);