Add timed mutes so a temporary problem stops needing a permanent exemption

Every existing exemption lasts until someone remembers to undo it, and nobody
does — Healarr has sat in a pressure list since it was uninstalled and seven
ignore entries name containers that are gone. A mute states when it ends and
then ends, capped by WATCHDOG_MUTE_MAX_HOURS so temporary is enforced rather
than intended. Applied where IGNORE_MAP is built, so all five check sites
inherit it, and shown with its countdown because an invisible suppression is
the thing being fixed.

Plugin/unraid/pages/watchdog.php

@@ -514,6 +514,22 @@ function _dockerCard(node, cfg) {
     }
   }
 
+  // Shown with the time left, not just the name. A mute whose remaining time is invisible is
+  // indistinguishable from the permanent exemptions it was built to replace — the countdown is
+  // the entire difference, so it is the part that has to be on screen.
+  const mutes = st.mutes || {};
+  const muteNames = Object.keys(mutes);
+  const muteHtml = muteNames.length === 0
+    ? '<div style="color:#333;font-size:11px;">none</div>'
+    : `<div class="vv-wd-pill-row">${muteNames.map(n => {
+        const m = mutes[n];
+        const left = m.left >= 3600 ? Math.round(m.left / 3600) + 'h'
+                   : m.left >= 60   ? Math.round(m.left / 60) + 'm'
+                                    : m.left + 's';
+        return `<span class="vv-wd-pill warn" title="${vvEscAttr(m.reason || 'no reason given')}">`
+             + `${vvEscHtml(n)} · ${left}</span>`;
+      }).join('')}</div>`;
+
   let skipHtml = '';
   if (skiplist.length === 0) {
     skipHtml = '<div style="color:#333;font-size:11px;">empty</div>';
@@ -548,6 +564,9 @@ function _dockerCard(node, cfg) {
     <div class="vv-wd-sec">Skip list</div>
     ${skipHtml}
     <hr class="vv-wd-sep">
+    <div class="vv-wd-sec">Muted</div>
+    ${muteHtml}
+    <hr class="vv-wd-sep">
     <div class="vv-wd-sec">Restarts (24h)</div>
     ${restartHtml}
   </div>`;