fix(webui): close EventSource and clear timers on component unmount

Prevent memory leaks by ensuring the search EventSource connection is
closed when the modal unmounts and setTimeout handles are cleared in
copy-to-clipboard flows across modal components.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

webui/src/components/ab-add-rss.vue

@@ -147,17 +147,24 @@ function goBack() {
   step.value = 'input';
 }
 
+let copyTimer: ReturnType<typeof setTimeout> | undefined;
+
 async function copyRssLink() {
   const rssLink = rule.value.rss_link?.[0] || rss.value.url || '';
   if (rssLink) {
     await navigator.clipboard.writeText(rssLink);
     copied.value = true;
-    setTimeout(() => {
+    clearTimeout(copyTimer);
+    copyTimer = setTimeout(() => {
       copied.value = false;
     }, 2000);
   }
 }
 
+onBeforeUnmount(() => {
+  clearTimeout(copyTimer);
+});
+
 async function autoDetectOffset() {
   if (!rule.value.id) return;
   offsetLoading.value = true;

webui/src/components/ab-edit-rule.vue

@@ -82,17 +82,24 @@ const infoTags = computed(() => {
 });
 
 // Copy RSS link
+let copyTimer: ReturnType<typeof setTimeout> | undefined;
+
 async function copyRssLink() {
   const rssLink = localRule.value.rss_link?.[0] || '';
   if (rssLink) {
     await navigator.clipboard.writeText(rssLink);
     copied.value = true;
-    setTimeout(() => {
+    clearTimeout(copyTimer);
+    copyTimer = setTimeout(() => {
       copied.value = false;
     }, 2000);
   }
 }
 
+onBeforeUnmount(() => {
+  clearTimeout(copyTimer);
+});
+
 // Auto detect offset using the new detectOffset API
 async function autoDetectOffset() {
   if (!localRule.value.official_title || !localRule.value.season) return;

webui/src/components/search/ab-search-confirm.vue

@@ -103,17 +103,24 @@ const infoTags = computed(() => {
 });
 
 // Copy RSS link
+let copyTimer: ReturnType<typeof setTimeout> | undefined;
+
 async function copyRssLink() {
   const rssLink = localBangumi.value.rss_link?.[0] || '';
   if (rssLink) {
     await navigator.clipboard.writeText(rssLink);
     copied.value = true;
-    setTimeout(() => {
+    clearTimeout(copyTimer);
+    copyTimer = setTimeout(() => {
       copied.value = false;
     }, 2000);
   }
 }
 
+onBeforeUnmount(() => {
+  clearTimeout(copyTimer);
+});
+
 // Auto detect offset
 async function autoDetectOffset() {
   if (!localBangumi.value.id) return;

webui/src/components/search/ab-search-modal.vue

@@ -27,6 +27,7 @@ const {
   getProviders,
   onSearch,
   clearSearch,
+  closeSearch,
   selectResult,
   clearSelectedResult,
 } = useSearchStore();
@@ -61,6 +62,11 @@ const expandedCategories = ref<Set<'group' | 'resolution' | 'subtitle' | 'season
 // Track which bangumi groups have expanded variants
 const expandedVariants = ref<Set<string>>(new Set());
 
+// Close EventSource on unmount (prevents leak if navigating away mid-search)
+onBeforeUnmount(() => {
+  closeSearch();
+});
+
 // Close on Escape
 onKeyStroke('Escape', () => {
   if (selectedResult.value) {