fix(docs): resolve search modal z-index and click issues

Fixed two critical search issues:

1. Search modal appearing at footer
   - Increased z-index from 1000 to 10000
   - Body scanlines overlay was at z-index 1000, covering modal
   - Search container now at z-index 10001

2. Search results not clickable
   - Added z-index layering: backdrop (10000) < container (10001) < results (10002) < items (10003)
   - Ensures proper stacking order for click events
   - Search result items now properly receive pointer events

Changes:
- .search-modal: z-index 1000 → 10000
- .search-container: added z-index 10001
- .search-backdrop: added z-index 10000
- .search-results: added z-index 10002
- .search-result-item: added z-index 10003

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

Co-Authored-By: Claude <[email protected]>

Author: 0xrinegade

docs/css/multipage.css

@@ -215,7 +215,7 @@
     display: flex;
     align-items: flex-start;
     justify-content: center;
-    z-index: 1000;
+    z-index: 10000;
     padding-top: 10vh;
     opacity: 0;
     transition: opacity 0.2s ease;
@@ -232,6 +232,7 @@
     width: 100%;
     height: 100%;
     cursor: pointer;
+    z-index: 10000;
 }
 
 .search-container {
@@ -244,6 +245,7 @@
     display: flex;
     flex-direction: column;
     position: relative;
+    z-index: 10001;
     transform: translateY(-20px);
     transition: transform 0.2s ease;
     box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
@@ -301,6 +303,8 @@
     overflow-y: auto;
     min-height: 200px;
     max-height: 400px;
+    position: relative;
+    z-index: 10002;
 }
 
 .search-empty {
@@ -339,6 +343,8 @@
     border-bottom: 1px solid var(--gray);
     cursor: pointer;
     transition: all var(--transition-fast);
+    position: relative;
+    z-index: 10003;
 }
 
 .search-result-item:hover,