Add search term highlighting in PDF viewer

Search Results Enhancement:
- Pass search query to document viewer via URL parameter
- Search results already show highlights via Meilisearch <mark> tags

PDF Document Viewer:
- Accept search query from URL (?q=search+term)
- Highlight matching text in PDF text layer
- Case-insensitive search term matching
- Auto-scroll to first match with smooth behavior
- Yellow highlight with pulsing animation for visibility

Highlighting Features:
- Uses regex to find all instances of search term
- Preserves PDF.js text layer positioning
- Highlights visible immediately after page render
- Text remains fully selectable
- Works with digitized/text-based PDFs

Styling:
- Yellow background (rgba(255, 215, 0, 0.6))
- Black text for contrast
- Pulsing animation on initial load
- Rounded corners for polish

User Flow:
1. User searches in SearchView
2. Clicks on search result
3. Navigates to DocumentView with ?q=term&page=X
4. PDF page renders with matching text highlighted
5. Page auto-scrolls to first match

This completes the search highlighting feature requested by the user,
making it easy to find searched terms within PDF documents.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

client/src/views/DocumentView.vue

@@ -157,6 +157,7 @@ const route = useRoute()
 const documentId = ref(route.params.id)
 const currentPage = ref(parseInt(route.query.page, 10) || 1)
 const pageInput = ref(currentPage.value)
+const searchQuery = ref(route.query.q || '')
 const totalPages = ref(0)
 const documentTitle = ref('Loading...')
 const boatInfo = ref('')
@@ -216,6 +217,41 @@ async function loadDocument() {
   }
 }
 
+function highlightSearchTerms() {
+  if (!textLayer.value || !searchQuery.value) return
+
+  const spans = textLayer.value.querySelectorAll('span')
+  const query = searchQuery.value.toLowerCase().trim()
+  let firstMatch = null
+
+  spans.forEach(span => {
+    const text = span.textContent
+    if (!text) return
+
+    const lowerText = text.toLowerCase()
+    if (lowerText.includes(query)) {
+      // Create a highlighted version
+      const regex = new RegExp(`(${query.replace(/[.*+?^${}()|[\]\\]/g, '\\$&')})`, 'gi')
+      const highlightedText = text.replace(regex, '<mark class="search-highlight">$1</mark>')
+
+      // Wrap in a container to preserve PDF.js positioning
+      span.innerHTML = highlightedText
+
+      // Track first match for scrolling
+      if (!firstMatch) {
+        firstMatch = span
+      }
+    }
+  })
+
+  // Scroll to first match
+  if (firstMatch) {
+    setTimeout(() => {
+      firstMatch.scrollIntoView({ behavior: 'smooth', block: 'center' })
+    }, 100)
+  }
+}
+
 async function renderPage(pageNum) {
   if (!pdfDoc || componentIsUnmounting) return
 
@@ -280,6 +316,12 @@ async function renderPage(pageNum) {
           viewport: viewport,
           textDivs: []
         })
+
+        // Highlight search terms if query exists
+        if (searchQuery.value) {
+          await nextTick()
+          highlightSearchTerms()
+        }
       } catch (textErr) {
         console.warn('Failed to render text layer:', textErr)
       }
@@ -477,4 +519,23 @@ onBeforeUnmount(() => {
 .textLayer ::-moz-selection {
   background: rgba(255, 92, 178, 0.3);
 }
+
+/* Search highlighting */
+.search-highlight {
+  background-color: rgba(255, 215, 0, 0.6);
+  color: #000;
+  padding: 2px 0;
+  border-radius: 2px;
+  font-weight: 600;
+  animation: highlight-pulse 1.5s ease-in-out;
+}
+
+@keyframes highlight-pulse {
+  0%, 100% {
+    background-color: rgba(255, 215, 0, 0.6);
+  }
+  50% {
+    background-color: rgba(255, 215, 0, 0.9);
+  }
+}
 </style>

client/src/views/SearchView.vue

@@ -187,7 +187,10 @@ function viewDocument(result) {
   router.push({
     name: 'document',
     params: { id: result.docId },
-    query: { page: result.pageNumber }
+    query: {
+      page: result.pageNumber,
+      q: searchQuery.value // Pass search query for highlighting
+    }
   })
 }