Bug/v2/viewer annotations (#5245)

Show uneditable annotations on viewer
show editable annotations layer when in annotation tools (sign, add
image, add text)
Remove draw tool from viewer (this is replaced wholesale in an upcoming
PR so it wasn't worth doing the work to ensure it worked with the new
annotation layer set up_)
refactoring work, mostly renaming variables we can use for all
annotation based tools that had sign specific names.
remove "tools" tooltip

---------

Co-authored-by: Claude Sonnet 4.5 <[email protected]>

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

@@ -51,6 +51,7 @@ const EmbedPdfViewerContent = ({
     getScrollState,
     getRotationState,
     isAnnotationMode,
+    setAnnotationMode,
     isAnnotationsVisible,
     exportActions,
   } = useViewer();
@@ -82,15 +83,18 @@ const EmbedPdfViewerContent = ({
   // Navigation guard for unsaved changes
   const { setHasUnsavedChanges, registerUnsavedChangesChecker, unregisterUnsavedChangesChecker } = useNavigationGuard();
 
-  // Check if we're in signature mode OR viewer annotation mode
+  // Check if we're in an annotation tool
   const { selectedTool } = useNavigationState();
-  // Tools that use the stamp/signature placement system with hover preview
-  const isSignatureMode = selectedTool === 'sign' || selectedTool === 'addText' || selectedTool === 'addImage';
+  // Tools that require the annotation layer (Sign, Add Text, Add Image)
+  const isInAnnotationTool = selectedTool === 'sign' || selectedTool === 'addText' || selectedTool === 'addImage';
+
+  // Sync isAnnotationMode in ViewerContext with current tool
+  useEffect(() => {
+    setAnnotationMode(isInAnnotationTool);
+  }, [isInAnnotationTool, setAnnotationMode]);
 
-  // Enable annotations when: in sign mode, OR annotation mode is active, OR we want to show existing annotations
-  const shouldEnableAnnotations = isSignatureMode || isAnnotationMode || isAnnotationsVisible;
   const isPlacementOverlayActive = Boolean(
-    isSignatureMode && shouldEnableAnnotations && isPlacementMode && signatureConfig
+    isInAnnotationTool && isPlacementMode && signatureConfig
   );
 
   // Track which file tab is active
@@ -333,7 +337,8 @@ const EmbedPdfViewerContent = ({
               key={currentFile && isStirlingFile(currentFile) ? currentFile.fileId : (effectiveFile.file instanceof File ? effectiveFile.file.name : effectiveFile.url)}
               file={effectiveFile.file}
               url={effectiveFile.url}
-              enableAnnotations={shouldEnableAnnotations}
+              enableAnnotations={isAnnotationMode}
+              showBakedAnnotations={isAnnotationsVisible}
               signatureApiRef={signatureApiRef as React.RefObject<any>}
               historyApiRef={historyApiRef as React.RefObject<any>}
               onSignatureAdded={() => {