feat: +/- buttons on service pills for additive/subtractive filtering

- Replace single-click service pill filter with explicit +/− buttons
- '+' adds the service to the current filter (keeps other selections)
- '−' removes the service from the current filter
- Result pills keep toggle click behavior
- Add .pill__action styles for small inline buttons

backend/frontend/index.html

@@ -4,7 +4,7 @@
   <meta charset="UTF-8" />
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
   <title>Admin Operations Center</title>
-  <link rel="stylesheet" href="/style.css?v=10" />
+  <link rel="stylesheet" href="/style.css?v=11" />
   <script defer src="https://cdn.jsdelivr.net/npm/alpinejs@3.x.x/dist/cdn.min.js"></script>
   <script src="https://alcdn.msauth.net/browser/2.37.0/js/msal-browser.min.js" crossorigin="anonymous"></script>
 </head>
@@ -184,7 +184,11 @@
               <template x-for="(evt, idx) in askEvents" :key="evt.id || idx">
                 <article class="event event--compact">
                   <div class="event__meta">
-                    <span class="pill pill--clickable" x-text="evt.display_category || evt.service || '—'" @click="filterByService(evt.service || evt.display_category)" title="Filter by this service"></span>
+                    <span class="pill">
+                <span x-text="evt.display_category || evt.service || '—'"></span>
+                <span class="pill__action" @click.stop="addServiceFilter(evt.service || evt.display_category)" title="Include this service">+</span>
+                <span class="pill__action" @click.stop="removeServiceFilter(evt.service || evt.display_category)" title="Exclude this service">−</span>
+              </span>
                     <span class="pill pill--clickable" :class="['success','succeeded','ok','passed','true'].includes((evt.result || '').toLowerCase()) ? 'pill--ok' : 'pill--warn'" x-text="evt.result || '—'" @click="filterByResult(evt.result)" title="Filter by this result"></span>
                   </div>
                   <h3 x-text="evt.operation || '—'"></h3>
@@ -670,13 +674,19 @@
           this.loadEvents();
         },
 
-        filterByService(service) {
+        addServiceFilter(service) {
           if (!service) return;
           if (!this.filters.selectedServices.includes(service)) {
-            this.filters.selectedServices = [service];
-          } else {
-            this.filters.selectedServices = this.filters.selectedServices.filter((s) => s !== service);
+            this.filters.selectedServices.push(service);
+            this.saveFilters();
+            this.resetPagination();
+            this.loadEvents();
           }
+        },
+
+        removeServiceFilter(service) {
+          if (!service) return;
+          this.filters.selectedServices = this.filters.selectedServices.filter((s) => s !== service);
           this.saveFilters();
           this.resetPagination();
           this.loadEvents();