Chore/v2/ctrlf (#5217)

# Description of Changes

<!--
Please provide a summary of the changes, including:

- What was changed
- Why the change was made
- Any challenges encountered

Closes #(issue_number)
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---

## Checklist

### General

- [ ] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [ ] I have read the [Stirling-PDF Developer
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/DeveloperGuide.md)
(if applicable)
- [ ] I have read the [How to add new languages to
Stirling-PDF](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md)
(if applicable)
- [ ] I have performed a self-review of my own code
- [ ] My changes generate no new warnings

### Documentation

- [ ] I have updated relevant docs on [Stirling-PDF's doc
repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/)
(if functionality has heavily changed)
- [ ] I have read the section [Add New Translation
Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md#add-new-translation-tags)
(for new translation tags only)

### UI Changes (if applicable)

- [ ] Screenshots or videos demonstrating the UI changes are attached
(e.g., as comments or direct attachments in the PR)

### Testing (if applicable)

- [ ] I have tested my changes locally. Refer to the [Testing
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/DeveloperGuide.md#6-testing)
for more details.

frontend/src/core/components/viewer/CustomSearchLayer.tsx

@@ -44,8 +44,10 @@ export function CustomSearchLayer({
     }
 
     const unsubscribe = searchProvides.onSearchResultStateChange?.((state: SearchResultState) => {
+      if (!state) return;
+
       // Auto-scroll to active search result
-      if (state?.results && state.activeResultIndex !== undefined && state.activeResultIndex >= 0) {
+      if (state.results && state.activeResultIndex !== undefined && state.activeResultIndex >= 0) {
         const activeResult = state.results[state.activeResultIndex];
         if (activeResult) {
           const pageNumber = activeResult.pageIndex + 1; // Convert to 1-based page number

frontend/src/core/components/viewer/EmbedPdfViewer.tsx

@@ -43,6 +43,8 @@ const EmbedPdfViewerContent = ({
     isThumbnailSidebarVisible,
     toggleThumbnailSidebar,
     isBookmarkSidebarVisible,
+    isSearchInterfaceVisible,
+    searchInterfaceActions,
     zoomActions,
     panActions: _panActions,
     rotationActions: _rotationActions,
@@ -184,7 +186,7 @@ const EmbedPdfViewerContent = ({
     onZoomOut: zoomActions.zoomOut,
   });
 
-  // Handle keyboard zoom shortcuts
+  // Handle keyboard shortcuts (zoom and search)
   useEffect(() => {
     const handleKeyDown = (event: KeyboardEvent) => {
       if (!isViewerHovered) return;
@@ -199,6 +201,16 @@ const EmbedPdfViewerContent = ({
           // Ctrl+- for zoom out
           event.preventDefault();
           zoomActions.zoomOut();
+        } else if (event.key === 'f' || event.key === 'F') {
+          // Ctrl+F for search
+          event.preventDefault();
+          if (isSearchInterfaceVisible) {
+            // If already open, trigger refocus event
+            window.dispatchEvent(new CustomEvent('refocus-search-input'));
+          } else {
+            // Open search interface
+            searchInterfaceActions.open();
+          }
         }
       }
     };
@@ -207,7 +219,7 @@ const EmbedPdfViewerContent = ({
     return () => {
       document.removeEventListener('keydown', handleKeyDown);
     };
-  }, [isViewerHovered]);
+  }, [isViewerHovered, isSearchInterfaceVisible, zoomActions, searchInterfaceActions]);
 
   // Register checker for unsaved changes (annotations only for now)
   useEffect(() => {

frontend/src/core/components/viewer/SearchAPIBridge.tsx

@@ -28,9 +28,11 @@ export function SearchAPIBridge() {
     if (!search) return;
 
     const unsubscribe = search.onSearchResultStateChange?.((state: any) => {
+      if (!state) return;
+
       const newState = {
-        results: state?.results || null,
+        results: state.results || null,
-        activeIndex: (state?.activeResultIndex || 0) + 1 // Convert to 1-based index
+        activeIndex: (state.activeResultIndex || 0) + 1 // Convert to 1-based index
       };
 
       setLocalState(prevState => {
@@ -52,16 +54,42 @@ export function SearchAPIBridge() {
         state: localState,
         api: {
           search: async (query: string) => {
+            if (search?.startSearch && search?.searchAllPages) {
               search.startSearch();
               return search.searchAllPages(query);
+            }
           },
           clear: () => {
+            try {
+              if (search?.stopSearch) {
                 search.stopSearch();
+              }
+            } catch (error) {
+              console.warn('Error stopping search:', error);
+            }
             setLocalState({ results: null, activeIndex: 0 });
           },
-          next: () => search.nextResult(),
+          next: () => {
-          previous: () => search.previousResult(),
+            try {
-          goToResult: (index: number) => search.goToResult(index),
+              search?.nextResult?.();
+            } catch (error) {
+              console.warn('Error navigating to next result:', error);
+            }
+          },
+          previous: () => {
+            try {
+              search?.previousResult?.();
+            } catch (error) {
+              console.warn('Error navigating to previous result:', error);
+            }
+          },
+          goToResult: (index: number) => {
+            try {
+              search?.goToResult?.(index);
+            } catch (error) {
+              console.warn('Error going to result:', error);
+            }
+          },
         }
       });
     }

frontend/src/core/components/viewer/SearchInterface.tsx

@@ -1,4 +1,4 @@
-import React, { useState, useEffect } from 'react';
+import React, { useState, useEffect, useRef } from 'react';
 import { Box, TextInput, ActionIcon, Text, Group } from '@mantine/core';
 import { useTranslation } from 'react-i18next';
 import { LocalIcon } from '@app/components/shared/LocalIcon';
@@ -12,6 +12,8 @@ interface SearchInterfaceProps {
 export function SearchInterface({ visible, onClose }: SearchInterfaceProps) {
   const { t } = useTranslation();
   const viewerContext = React.useContext(ViewerContext);
+  const inputRef = useRef<HTMLInputElement>(null);
+  const searchTimeoutRef = useRef<NodeJS.Timeout | null>(null);
 
   const searchState = viewerContext?.getSearchState();
   const searchResults = searchState?.results;
@@ -26,6 +28,61 @@ export function SearchInterface({ visible, onClose }: SearchInterfaceProps) {
   } | null>(null);
   const [isSearching, setIsSearching] = useState(false);
 
+  // Auto-focus search input when visible
+  useEffect(() => {
+    if (visible) {
+      inputRef.current?.focus();
+    }
+  }, [visible]);
+
+  // Listen for refocus event (when Ctrl+F pressed while already open)
+  useEffect(() => {
+    const handleRefocus = () => {
+      inputRef.current?.focus();
+      inputRef.current?.select();
+    };
+
+    window.addEventListener('refocus-search-input', handleRefocus);
+    return () => {
+      window.removeEventListener('refocus-search-input', handleRefocus);
+    };
+  }, []);
+
+  // Auto-search as user types (debounced)
+  useEffect(() => {
+    // Clear existing timeout
+    if (searchTimeoutRef.current) {
+      clearTimeout(searchTimeoutRef.current);
+    }
+
+    // If query is empty, clear search immediately
+    if (!searchQuery.trim()) {
+      searchActions?.clear();
+      setResultInfo(null);
+      return;
+    }
+
+    // Debounce search by 300ms
+    searchTimeoutRef.current = setTimeout(async () => {
+      if (searchQuery.trim() && searchActions) {
+        setIsSearching(true);
+        try {
+          await searchActions.search(searchQuery.trim());
+        } catch (error) {
+          console.error('Search failed:', error);
+        } finally {
+          setIsSearching(false);
+        }
+      }
+    }, 300);
+
+    return () => {
+      if (searchTimeoutRef.current) {
+        clearTimeout(searchTimeoutRef.current);
+      }
+    };
+  }, [searchQuery, searchActions]);
+
   // Monitor search state changes
   useEffect(() => {
     if (!visible) return;
@@ -59,30 +116,21 @@ export function SearchInterface({ visible, onClose }: SearchInterfaceProps) {
     return () => clearInterval(interval);
   }, [visible, searchResults, searchActiveIndex, searchQuery]);
 
-  const handleSearch = async (query: string) => {
-    if (!query.trim()) {
-      // If query is empty, clear the search
-      handleClearSearch();
-      return;
-    }
-
-    if (query.trim() && searchActions) {
-      setIsSearching(true);
-      try {
-        await searchActions.search(query.trim());
-      } catch (error) {
-        console.error('Search failed:', error);
-      } finally {
-        setIsSearching(false);
-      }
-    }
-  };
-
   const handleKeyDown = (event: React.KeyboardEvent<HTMLInputElement>) => {
     if (event.key === 'Enter') {
-      handleSearch(searchQuery);
+      // Navigate to next result on Enter
+      event.preventDefault();
+      handleNext();
     } else if (event.key === 'Escape') {
       onClose();
+    } else if (event.key === 'ArrowDown') {
+      // Navigate to next result
+      event.preventDefault();
+      handleNext();
+    } else if (event.key === 'ArrowUp') {
+      // Navigate to previous result
+      event.preventDefault();
+      handlePrevious();
     }
   };
 
@@ -103,17 +151,17 @@ export function SearchInterface({ visible, onClose }: SearchInterfaceProps) {
   // No longer need to sync with external API on mount - removed
 
   const handleJumpToResult = (index: number) => {
-    // Use context actions instead of window API - functionality simplified for now
     if (resultInfo && index >= 1 && index <= resultInfo.totalResults) {
-      // Note: goToResult functionality would need to be implemented in SearchAPIBridge
+      // Convert to 0-based index for the API
-      console.log('Jump to result:', index);
+      searchActions?.goToResult?.(index - 1);
     }
   };
 
   const handleJumpToSubmit = () => {
-    const index = parseInt(jumpToValue);
+    const index = parseInt(jumpToValue, 10);
-    if (index && resultInfo && index >= 1 && index <= resultInfo.totalResults) {
+    if (!isNaN(index) && resultInfo && index >= 1 && index <= resultInfo.totalResults) {
       handleJumpToResult(index);
+      setJumpToValue(''); // Clear the input after jumping
     }
   };
 
@@ -123,7 +171,14 @@ export function SearchInterface({ visible, onClose }: SearchInterfaceProps) {
     }
   };
 
-  const _handleClose = () => {
+  const handleInputBlur = () => {
+    // Close popover on blur if no text is entered
+    if (!searchQuery.trim()) {
+      onClose();
+    }
+  };
+
+  const handleCloseClick = () => {
     handleClearSearch();
     onClose();
   };
@@ -135,75 +190,84 @@ export function SearchInterface({ visible, onClose }: SearchInterfaceProps) {
         padding: '0px'
       }}
     >
-      {/* Header */}
+      {/* Header with close button */}
-      <Group mb="md">
+      <Group mb="md" justify="space-between">
         <Text size="sm" fw={600}>
           {t('search.title', 'Search PDF')}
         </Text>
+        <ActionIcon
+          variant="subtle"
+          size="sm"
+          onClick={handleCloseClick}
+          aria-label="Close search"
+        >
+          <LocalIcon icon="close" width="1rem" height="1rem" />
+        </ActionIcon>
       </Group>
 
       {/* Search input */}
       <Group mb="md">
         <TextInput
+          ref={inputRef}
           placeholder={t('search.placeholder', 'Enter search term...')}
           value={searchQuery}
           onChange={(e) => {
             const newValue = e.currentTarget.value;
             setSearchQuery(newValue);
-            // If user clears the input, clear the search highlights
-            if (!newValue.trim()) {
-              handleClearSearch();
-            }
           }}
           onKeyDown={handleKeyDown}
+          onBlur={handleInputBlur}
           style={{ flex: 1 }}
           rightSection={
+            searchQuery.trim() && (
               <ActionIcon
                 variant="subtle"
-              onClick={() => handleSearch(searchQuery)}
+                onClick={handleClearSearch}
-              disabled={!searchQuery.trim() || isSearching}
+                aria-label="Clear search"
-              loading={isSearching}
               >
-              <LocalIcon icon="search" width="1rem" height="1rem" />
+                <LocalIcon icon="close" width="0.875rem" height="0.875rem" />
               </ActionIcon>
+            )
           }
         />
       </Group>
 
-      {/* Results info and navigation */}
+      {/* Results info and navigation - always show */}
-      {resultInfo && (
       <Group justify="space-between" align="center">
-          {resultInfo.totalResults === 0 ? (
-            <Text size="sm" c="dimmed">
-              {t('search.noResults', 'No results found')}
-            </Text>
-          ) : (
         <Group gap="xs" align="center">
           <TextInput
             size="xs"
             value={jumpToValue}
-                onChange={(e) => setJumpToValue(e.currentTarget.value)}
+            onChange={(e) => {
+              const newValue = e.currentTarget.value;
+              setJumpToValue(newValue);
+
+              // Jump immediately as user types
+              const index = parseInt(newValue, 10);
+              if (resultInfo && !isNaN(index) && index >= 1 && index <= resultInfo.totalResults) {
+                handleJumpToResult(index);
+              }
+            }}
             onKeyDown={handleJumpToKeyDown}
-                onBlur={handleJumpToSubmit}
+            onBlur={() => setJumpToValue('')} // Clear on blur instead of submit
-                placeholder={resultInfo.currentIndex.toString()}
+            placeholder={(resultInfo?.currentIndex || 0).toString()}
             style={{ width: '3rem' }}
             type="number"
             min="1"
-                max={resultInfo.totalResults}
+            max={resultInfo?.totalResults || 0}
+            disabled={!resultInfo || resultInfo.totalResults === 0}
           />
           <Text size="sm" c="dimmed">
-                of {resultInfo.totalResults}
+            of {resultInfo?.totalResults || 0}
           </Text>
         </Group>
-          )}
 
-          {resultInfo.totalResults > 0 && (
         <Group gap="xs">
           <ActionIcon
             variant="subtle"
             size="sm"
             onClick={handlePrevious}
-                disabled={resultInfo.currentIndex <= 1}
+            disabled={!resultInfo || resultInfo.currentIndex <= 1}
             aria-label="Previous result"
           >
             <LocalIcon icon="keyboard-arrow-up" width="1rem" height="1rem" />
@@ -212,23 +276,13 @@ export function SearchInterface({ visible, onClose }: SearchInterfaceProps) {
             variant="subtle"
             size="sm"
             onClick={handleNext}
-                disabled={resultInfo.currentIndex >= resultInfo.totalResults}
+            disabled={!resultInfo || resultInfo.currentIndex >= resultInfo.totalResults}
             aria-label="Next result"
           >
             <LocalIcon icon="keyboard-arrow-down" width="1rem" height="1rem" />
           </ActionIcon>
-              <ActionIcon
-                variant="subtle"
-                size="sm"
-                onClick={handleClearSearch}
-                aria-label="Clear search"
-              >
-                <LocalIcon icon="close" width="1rem" height="1rem" />
-              </ActionIcon>
         </Group>
-          )}
       </Group>
-      )}
 
       {/* Loading state */}
       {isSearching && (

frontend/src/core/components/viewer/useViewerRightRailButtons.tsx

@@ -36,7 +36,14 @@ export function useViewerRightRailButtons() {
         order: 10,
         render: ({ disabled }) => (
           <Tooltip content={searchLabel} position={tooltipPosition} offset={12} arrow portalTarget={document.body}>
-            <Popover position={tooltipPosition} withArrow shadow="md" offset={8}>
+            <Popover
+              position={tooltipPosition}
+              withArrow
+              shadow="md"
+              offset={8}
+              opened={viewer.isSearchInterfaceVisible}
+              onClose={viewer.searchInterfaceActions.close}
+            >
               <Popover.Target>
                 <div style={{ display: 'inline-flex' }}>
                   <ActionIcon
@@ -45,6 +52,7 @@ export function useViewerRightRailButtons() {
                     className="right-rail-icon"
                     disabled={disabled}
                     aria-label={searchLabel}
+                    onClick={viewer.searchInterfaceActions.toggle}
                   >
                     <LocalIcon icon="search" width="1.5rem" height="1.5rem" />
                   </ActionIcon>
@@ -52,7 +60,7 @@ export function useViewerRightRailButtons() {
               </Popover.Target>
               <Popover.Dropdown>
                 <div style={{ minWidth: '20rem' }}>
-                  <SearchInterface visible={true} onClose={() => {}} />
+                  <SearchInterface visible={viewer.isSearchInterfaceVisible} onClose={viewer.searchInterfaceActions.close} />
                 </div>
               </Popover.Dropdown>
             </Popover>

frontend/src/core/contexts/ViewerContext.tsx

@@ -80,6 +80,14 @@ interface ViewerContextType {
   isBookmarkSidebarVisible: boolean;
   toggleBookmarkSidebar: () => void;
 
+  // Search interface visibility
+  isSearchInterfaceVisible: boolean;
+  searchInterfaceActions: {
+    open: () => void;
+    close: () => void;
+    toggle: () => void;
+  };
+
   // Annotation visibility toggle
   isAnnotationsVisible: boolean;
   toggleAnnotationsVisibility: () => void;
@@ -145,6 +153,7 @@ export const ViewerProvider: React.FC<ViewerProviderProps> = ({ children }) => {
   // UI state - only state directly managed by this context
   const [isThumbnailSidebarVisible, setIsThumbnailSidebarVisible] = useState(false);
   const [isBookmarkSidebarVisible, setIsBookmarkSidebarVisible] = useState(false);
+  const [isSearchInterfaceVisible, setSearchInterfaceVisible] = useState(false);
   const [isAnnotationsVisible, setIsAnnotationsVisible] = useState(true);
   const [isAnnotationMode, setIsAnnotationModeState] = useState(false);
   const [activeFileIndex, setActiveFileIndex] = useState(0);
@@ -207,6 +216,12 @@ export const ViewerProvider: React.FC<ViewerProviderProps> = ({ children }) => {
     setIsBookmarkSidebarVisible(prev => !prev);
   };
 
+  const searchInterfaceActions = {
+    open: () => setSearchInterfaceVisible(true),
+    close: () => setSearchInterfaceVisible(false),
+    toggle: () => setSearchInterfaceVisible(prev => !prev),
+  };
+
   const toggleAnnotationsVisibility = () => {
     setIsAnnotationsVisible(prev => !prev);
   };
@@ -294,6 +309,10 @@ export const ViewerProvider: React.FC<ViewerProviderProps> = ({ children }) => {
     isBookmarkSidebarVisible,
     toggleBookmarkSidebar,
 
+    // Search interface
+    isSearchInterfaceVisible,
+    searchInterfaceActions,
+
     // Annotation controls
     isAnnotationsVisible,
     toggleAnnotationsVisibility,

frontend/src/core/contexts/viewer/viewerActions.ts

@@ -52,6 +52,7 @@ export interface SearchActions {
   next: () => void;
   previous: () => void;
   clear: () => void;
+  goToResult: (index: number) => void;
 }
 
 export interface ExportActions {
@@ -287,6 +288,12 @@ export function createViewerActions({
         api.clear();
       }
     },
+    goToResult: (index: number) => {
+      const api = registry.current.search?.api;
+      if (api?.goToResult) {
+        api.goToResult(index);
+      }
+    },
   };
 
   const exportActions: ExportActions = {