feat: various UI fixes, prompt optimizations, and allowing duplicate docs

- Updated `content_hash` in the `Document` model to remove global uniqueness, allowing identical content across different paths.
- Enhanced `_create_document` function to handle path uniqueness and prevent session-poisoning from `IntegrityError`.
- Added detailed comments for clarity on the changes and their implications.
- Introduced new citation handling in the editor for improved user experience with citation jumps.
- Updated package dependencies in the frontend for better functionality.

surfsense_web/atoms/document-viewer/pending-chunk-highlight.atom.ts

@@ -0,0 +1,19 @@
+import { atom } from "jotai";
+
+/**
+ * Cross-component handoff for citation jumps. Set by `InlineCitation` when a
+ * numeric chunk badge is clicked (after the document has been resolved); read
+ * by `DocumentTabContent` once the matching document tab mounts so it can
+ * scroll to and softly highlight the cited chunk inside the rendered markdown.
+ *
+ * Cleared by `DocumentTabContent` only after a terminal state — exact /
+ * approximate / miss — has been reached, so that an escalation refetch (2MB
+ * preview → 16MB) keeps the pending intent alive across the re-render.
+ */
+export interface PendingChunkHighlight {
+	documentId: number;
+	chunkId: number;
+	chunkText: string;
+}
+
+export const pendingChunkHighlightAtom = atom<PendingChunkHighlight | null>(null);