Improve annotations (#5919)

* Text box/notes movement improvements ✅
* Fix the issue where hiding, then showing annotations looses progress ✅
* Fix the issue where hidig/showing annotations jumps you back up to the
top of your open document ✅
* Support ctrl+c and  ctrl+v and backspace to delete ✅
* Better handling when moving to different tool from annotate ✅
* Added a color picker eyedropper button  ✅
* Auto-switch to Select after note/text placement, so users can quickly
place and type ✅

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

@@ -1066,6 +1066,8 @@ const EmbedPdfViewerContent = ({
           onDiscardAndContinue={async () => {
             // Save applied redactions (if any) while discarding pending ones
             await discardAndSaveApplied();
+            // Reset annotation changes ref so future show/hide doesn't re-prompt
+            hasAnnotationChangesRef.current = false;
           }}
         />
       )}