feat: implement PDF toolbar, viewer components, and redaction support layer

frontend/src/App.tsx

@@ -370,19 +370,31 @@ function App() {
     setCurrentPage(to);
   };
 
-  const handleRedactArea = (pageIndex: number, bounds: Rect) => {
+  const [pendingRedactions, setPendingRedactions] = useState<{ id: string, pageIndex: number, bounds: Rect }[]>([]);
+
+  const handleMarkRedaction = (pageIndex: number, bounds: Rect) => {
+    setPendingRedactions(prev => [...prev, { id: rid('redmark'), pageIndex, bounds }]);
+  };
+
+  const handleApplyRedactions = () => {
     if (!activeDoc) return;
     if (!can('canModify')) { denyToast('Redaction'); return; }
-    const pdf = viewportRectToPdf(bounds, zoom, pageHeightPts(pageIndex));
+    if (pendingRedactions.length === 0) return;
+
     setConfirmState({
-      title: 'Redact area?',
-      message: 'All text, images, and vectors underneath will be permanently removed from the file. This cannot be undone after export.',
-      confirmLabel: 'Redact', danger: true,
+      title: 'Apply Redactions?',
+      message: 'All text, images, and vectors underneath will be permanently removed from the file. This cannot be undone.',
+      confirmLabel: 'Apply', danger: true,
       onConfirm: () => {
-        applyOps([{
-          id: rid('redact'), type: 'redaction', pageIndex,
-          data: { x: pdf.x, y: pdf.y, width: pdf.width, height: pdf.height, fillColor: '#ffffff' },
-        }], 'Area redacted');
+        const ops = pendingRedactions.map(mark => {
+          const pdf = viewportRectToPdf(mark.bounds, zoom, pageHeightPts(mark.pageIndex));
+          return {
+            id: mark.id, type: 'redaction' as const, pageIndex: mark.pageIndex,
+            data: { x: pdf.x, y: pdf.y, width: pdf.width, height: pdf.height, fillColor: '#000000' },
+          };
+        });
+        applyOps(ops, 'Redactions applied');
+        setPendingRedactions([]);
         setActiveTool('select');
       },
     });
@@ -543,6 +555,9 @@ function App() {
             hasSignature={!!pendingSignature}
             activeStamp={activeStamp?.label ?? null}
             onSelectStamp={(label, color) => setActiveStamp({ label, color })}
+            pendingRedactionCount={pendingRedactions.length}
+            onApplyRedactions={handleApplyRedactions}
+            onClearRedactions={() => setPendingRedactions([])}
           />
 
           <div className="relative min-h-0 flex-1">
@@ -585,7 +600,9 @@ function App() {
                   if (!isInspectorOpen) setIsInspectorOpen(true);
                 }}
                 onPageVisible={setCurrentPage}
-                onRedactArea={handleRedactArea}
+                onMarkRedaction={handleMarkRedaction}
+                pendingRedactions={pendingRedactions}
+                onRemoveRedaction={(id) => setPendingRedactions(p => p.filter(x => x.id !== id))}
                 onPlaceText={handlePlaceText}
                 onEditText={handleEditText}
                 onReflowParagraph={handleReflowParagraph}

frontend/src/components/Toolbar.tsx

@@ -17,6 +17,9 @@ interface ToolbarProps {
   hasSignature: boolean;
   activeStamp: string | null;
   onSelectStamp: (label: string, color: string) => void;
+  pendingRedactionCount?: number;
+  onApplyRedactions?: () => void;
+  onClearRedactions?: () => void;
 }
 
 const TOOL_META: Record<ToolId, { label: string; icon: React.ReactNode }> = {
@@ -54,6 +57,7 @@ const Divider = () => <div className="mx-1 h-5 w-px shrink-0 bg-[#ebedf0]" />;
 
 export const Toolbar: React.FC<ToolbarProps> = ({
   activeTool, settings, onSettingsChange, onOpenSignature, hasSignature, activeStamp, onSelectStamp,
+  pendingRedactionCount = 0, onApplyRedactions, onClearRedactions,
 }) => {
   const meta = TOOL_META[activeTool];
   const isRedact = activeTool === 'redact';
@@ -161,7 +165,22 @@ export const Toolbar: React.FC<ToolbarProps> = ({
           </>
         )}
 
-        {activeTool === 'redact' && <Hint tone="warn">⚠ Drag a box to permanently remove content underneath.</Hint>}
+        {activeTool === 'redact' && (
+          <>
+            {pendingRedactionCount > 0 ? (
+              <>
+                <CustomButton variant="primary" size="sm" onClick={onApplyRedactions}>
+                  Apply {pendingRedactionCount} Redaction{pendingRedactionCount > 1 ? 's' : ''}
+                </CustomButton>
+                <CustomButton variant="outline" size="sm" onClick={onClearRedactions}>
+                  Clear
+                </CustomButton>
+              </>
+            ) : (
+              <Hint tone="warn">⚠ Drag a box to permanently remove content underneath.</Hint>
+            )}
+          </>
+        )}
       </div>
     </div>
   );

frontend/src/viewer/PDFViewer.tsx

@@ -36,7 +36,9 @@ interface PDFViewerProps {
   onAnnotationUpdate?: (anno: Annotation) => void;
   onAnnotationClick?: (anno: Annotation) => void;
   onPageVisible?: (pageIndex: number) => void;
-  onRedactArea?: (pageIndex: number, bounds: Rect) => void;
+  onMarkRedaction?: (pageIndex: number, bounds: Rect) => void;
+  pendingRedactions?: { id: string, pageIndex: number, bounds: Rect }[];
+  onRemoveRedaction?: (id: string) => void;
   onPlaceText?: (pageIndex: number, rectPts: Rect, text: string) => void;
   onEditText?: (pageIndex: number, run: EditableRun, newText: string, disableJustify?: boolean) => void;
   onReflowParagraph?: (pageIndex: number, payload: ReflowParagraphPayload) => void;
@@ -80,7 +82,9 @@ export const PDFViewer = React.forwardRef<PDFViewerRef, PDFViewerProps>(({
   onAnnotationUpdate,
   onAnnotationClick,
   onPageVisible,
-  onRedactArea,
+  onMarkRedaction,
+  pendingRedactions = [],
+  onRemoveRedaction,
   onPlaceText,
   onEditText,
   onReflowParagraph,
@@ -469,7 +473,9 @@ export const PDFViewer = React.forwardRef<PDFViewerRef, PDFViewerProps>(({
                       pageIndex={page.index}
                       width={page.width}
                       height={page.height}
-                      onRedactionSelected={(bounds) => onRedactArea?.(page.index, bounds)}
+                      onRedactionSelected={(bounds) => onMarkRedaction?.(page.index, bounds)}
+                      pendingRedactions={pendingRedactions.filter(r => r.pageIndex === page.index)}
+                      onRemoveRedaction={onRemoveRedaction}
                     />
                   )}
 

frontend/src/viewer/RedactionLayer.tsx

@@ -6,12 +6,16 @@ interface RedactionLayerProps {
   width: number;
   height: number;
   onRedactionSelected: (bounds: Rect) => void;
+  pendingRedactions?: { id: string, bounds: Rect }[];
+  onRemoveRedaction?: (id: string) => void;
 }
 
 export const RedactionLayer: React.FC<RedactionLayerProps> = ({
   width,
   height,
   onRedactionSelected,
+  pendingRedactions = [],
+  onRemoveRedaction,
 }) => {
   const [dragStart, setDragStart] = useState<Point | null>(null);
   const [redactBox, setRedactBox] = useState<Rect | null>(null);
@@ -86,6 +90,25 @@ export const RedactionLayer: React.FC<RedactionLayerProps> = ({
           }}
         />
       )}
+      
+      {pendingRedactions.map((redaction) => (
+        <div
+          key={redaction.id}
+          className="group absolute"
+          style={{
+            left: `${redaction.bounds.x}px`,
+            top: `${redaction.bounds.y}px`,
+            width: `${redaction.bounds.width}px`,
+            height: `${redaction.bounds.height}px`,
+            border: '2px solid #ef4444',
+            backgroundColor: 'rgba(239, 68, 68, 0.2)',
+            zIndex: 30,
+            cursor: 'pointer',
+          }}
+        >
+          <div className="absolute inset-0 hidden bg-black group-hover:block" title="Click to remove" onClick={(e) => { e.stopPropagation(); onRemoveRedaction?.(redaction.id); }} />
+        </div>
+      ))}
     </div>
   );
 };