Only call search API when pause in typing search query on web, desktop apps

Wait for 300ms since stop typing before calling search API.

This smooths out UI jitter when rendering search results, especially
now that we're reranking for every search query on GPU enabled devices

Emacs already has 300ms debounce time. More convoluted to add
debounce time to Obsidian search modal, so not updating that yet

src/interface/desktop/search.html

@@ -192,16 +192,17 @@
                 });
         }
 
+        let debounceTimeout;
         function incrementalSearch(event) {
+            // Run incremental search only after waitTime passed since the last key press
+            let waitTime = 300;
+            clearTimeout(debounceTimeout);
+            debounceTimeout = setTimeout(() => {
                 type = 'all';
                 // Search with reranking on 'Enter'
-            if (event.key === 'Enter') {
+                let should_rerank = event.key === 'Enter';
-                search(rerank=true);
+                search(rerank=should_rerank);
-            }
+            }, waitTime);
-            // Limit incremental search to text types
-            else if (type !== "image") {
-                search(rerank=false);
-            }
         }
 
         async function populate_type_dropdown() {

src/khoj/interface/web/search.html

@@ -193,16 +193,17 @@
                 });
         }
 
+        let debounceTimeout;
         function incrementalSearch(event) {
+            // Run incremental search only after waitTime passed since the last key press
+            let waitTime = 300;
+            clearTimeout(debounceTimeout);
+            debounceTimeout = setTimeout(() => {
                 type = document.getElementById("type").value;
                 // Search with reranking on 'Enter'
-            if (event.key === 'Enter') {
+                let should_rerank = event.key === 'Enter';
-                search(rerank=true);
+                search(rerank=should_rerank);
-            }
+            }, waitTime);
-            // Limit incremental search to text types
-            else if (type !== "image") {
-                search(rerank=false);
-            }
         }
 
         function populate_type_dropdown() {