feat(markdown): enable citation rendering in MarkdownViewer and related components

- Added `enableCitations` prop to `MarkdownViewer` to support interactive citation badges.
- Updated instances of `MarkdownViewer` across various components to utilize the new citation feature.
- Enhanced citation processing in `PlateEditor` for read-only views, ensuring citations are rendered correctly without affecting markdown serialization.
- Refactored citation handling in `InlineCitation` and `MarkdownText` to improve citation context management.

surfsense_web/lib/markdown/code-regions.ts

@@ -0,0 +1,8 @@
+// Matches fenced (```...```) and inline (`...`) code regions. Used by MDX
+// escaping and citation preprocessing — single source of truth so future
+// edits stay in sync.
+//
+// String.split() with this capturing pattern places non-code parts at even
+// indexes and matched code regions at odd indexes — preserve odd-indexed
+// segments verbatim when transforming markdown.
+export const FENCED_OR_INLINE_CODE = /(```[\s\S]*?```|`[^`\n]+`)/g;