feat(editor): preserve comment-id on blockquotes

Extend the default Blockquote with a `commentId` attribute that
round-trips through HTML as `data-comment-id`. This single attribute
is the canonical record of a reply: it survives TipTap serialize /
parse so the backend listener and the in-app renderer can both find
the parent comment without a separate schema field.

frontend/package.json

@@ -60,6 +60,7 @@
     "@kyvg/vue3-notification": "3.4.2",
     "@sentry/vue": "10.36.0",
     "@tiptap/core": "3.17.0",
+    "@tiptap/extension-blockquote": "3.17.0",
     "@tiptap/extension-code-block-lowlight": "3.17.0",
     "@tiptap/extension-hard-break": "3.17.0",
     "@tiptap/extension-image": "3.17.0",

frontend/pnpm-lock.yaml

@@ -44,6 +44,9 @@ importers:
       '@tiptap/core':
         specifier: 3.17.0
         version: 3.17.0(@tiptap/pm@3.17.0)
+      '@tiptap/extension-blockquote':
+        specifier: 3.17.0
+        version: 3.17.0(@tiptap/core@3.17.0(@tiptap/pm@3.17.0))
       '@tiptap/extension-code-block-lowlight':
         specifier: 3.17.0
         version: 3.17.0(@tiptap/core@3.17.0(@tiptap/pm@3.17.0))(@tiptap/extension-code-block@3.17.1(@tiptap/core@3.17.0(@tiptap/pm@3.17.0))(@tiptap/pm@3.17.0))(@tiptap/pm@3.17.0)(highlight.js@11.11.1)(lowlight@3.3.0)
@@ -2650,10 +2653,10 @@ packages:
     peerDependencies:
       '@tiptap/pm': ^3.17.0
 
-  '@tiptap/extension-blockquote@3.17.1':
+  '@tiptap/extension-blockquote@3.17.0':
-    resolution: {integrity: sha512-X4jU/fllJQ8QbjCHUafU4QIHBobyXP3yGBoOcXxUaKlWbLvUs0SQTREM3n6/86m2YyAxwTPG1cn3Xypf42DMAQ==}
+    resolution: {integrity: sha512-TVslb79JVoZUFO+O4lAHveu38asi1OEqNpLdnQr+SIijIi8WgvJv3VwQwZfkja91WUAHbOHGbnYN0QySOcVCtA==}
     peerDependencies:
-      '@tiptap/core': ^3.17.1
+      '@tiptap/core': ^3.17.0
 
   '@tiptap/extension-bold@3.17.1':
     resolution: {integrity: sha512-PZmrljcVBziJkQDXT/QJv4ESxVVQ0iRH+ruTzPda56Kk4h2310cSXGjI33W7rlCikGPoBAAjY/inujm46YB4bw==}
@@ -9441,7 +9444,7 @@ snapshots:
     dependencies:
       '@tiptap/pm': 3.17.0
 
-  '@tiptap/extension-blockquote@3.17.1(@tiptap/core@3.17.0(@tiptap/pm@3.17.0))':
+  '@tiptap/extension-blockquote@3.17.0(@tiptap/core@3.17.0(@tiptap/pm@3.17.0))':
     dependencies:
       '@tiptap/core': 3.17.0(@tiptap/pm@3.17.0)
 
@@ -9600,7 +9603,7 @@ snapshots:
   '@tiptap/starter-kit@3.17.0':
     dependencies:
       '@tiptap/core': 3.17.0(@tiptap/pm@3.17.0)
-      '@tiptap/extension-blockquote': 3.17.1(@tiptap/core@3.17.0(@tiptap/pm@3.17.0))
+      '@tiptap/extension-blockquote': 3.17.0(@tiptap/core@3.17.0(@tiptap/pm@3.17.0))
       '@tiptap/extension-bold': 3.17.1(@tiptap/core@3.17.0(@tiptap/pm@3.17.0))
       '@tiptap/extension-bullet-list': 3.17.1(@tiptap/extension-list@3.17.0(@tiptap/core@3.17.0(@tiptap/pm@3.17.0))(@tiptap/pm@3.17.0))
       '@tiptap/extension-code': 3.17.1(@tiptap/core@3.17.0(@tiptap/pm@3.17.0))

frontend/src/components/input/editor/TipTap.vue

@@ -166,6 +166,7 @@ import Mention from '@tiptap/extension-mention'
 
 import {TaskList} from '@tiptap/extension-list'
 import {TaskItemWithId} from './taskItemWithId'
+import {BlockquoteWithCommentId} from './blockquoteWithCommentId'
 import HardBreak from '@tiptap/extension-hard-break'
 
 import Commands from './commands'
@@ -417,7 +418,9 @@ const extensions : Extensions = [
 	StarterKit.configure({
 		codeBlock: false,
 		hardBreak: false,
+		blockquote: false,
 	}),
+	BlockquoteWithCommentId,
 
 	CodeBlockLowlight.configure({
 		lowlight: createLowlight(common),

frontend/src/components/input/editor/blockquoteWithCommentId.test.ts

@@ -0,0 +1,65 @@
+import {describe, it, expect} from 'vitest'
+import {Editor} from '@tiptap/core'
+import StarterKit from '@tiptap/starter-kit'
+import {BlockquoteWithCommentId} from './blockquoteWithCommentId'
+
+describe('BlockquoteWithCommentId extension', () => {
+	const createEditor = (content: string = '') => {
+		return new Editor({
+			extensions: [
+				StarterKit.configure({blockquote: false}),
+				BlockquoteWithCommentId,
+			],
+			content,
+		})
+	}
+
+	it('preserves data-comment-id through setContent → getHTML round-trip', () => {
+		const editor = createEditor('<blockquote data-comment-id="42"><p>hi</p></blockquote>')
+
+		const html = editor.getHTML()
+		expect(html).toContain('data-comment-id="42"')
+
+		editor.destroy()
+	})
+
+	it('renders a plain blockquote (no attribute) unchanged', () => {
+		const editor = createEditor('<blockquote><p>just a quote</p></blockquote>')
+
+		const html = editor.getHTML()
+		expect(html).toContain('<blockquote>')
+		expect(html).not.toContain('data-comment-id')
+
+		editor.destroy()
+	})
+
+	it('preserves nested rich content inside the blockquote', () => {
+		const editor = createEditor(
+			'<blockquote data-comment-id="7"><p>this is <strong>bold</strong> text</p></blockquote>',
+		)
+
+		const html = editor.getHTML()
+		expect(html).toContain('data-comment-id="7"')
+		expect(html).toContain('<strong>bold</strong>')
+
+		editor.destroy()
+	})
+
+	it('drops a malformed data-comment-id (non-integer)', () => {
+		const editor = createEditor('<blockquote data-comment-id="abc"><p>x</p></blockquote>')
+
+		const html = editor.getHTML()
+		expect(html).not.toContain('data-comment-id')
+
+		editor.destroy()
+	})
+
+	it('drops a non-positive data-comment-id', () => {
+		const editor = createEditor('<blockquote data-comment-id="0"><p>x</p></blockquote>')
+
+		const html = editor.getHTML()
+		expect(html).not.toContain('data-comment-id')
+
+		editor.destroy()
+	})
+})

frontend/src/components/input/editor/blockquoteWithCommentId.ts

@@ -0,0 +1,38 @@
+import Blockquote from '@tiptap/extension-blockquote'
+
+/**
+ * Blockquote extension that preserves `data-comment-id` across parse/serialize.
+ * Used as the canonical reply marker: a comment that quotes another comment
+ * stores the referenced comment's id on the wrapping blockquote, so both the
+ * backend (for implicit-mention notifications) and the frontend (for the
+ * jump-to-original chevron) can find it without a separate schema field.
+ */
+export const BlockquoteWithCommentId = Blockquote.extend({
+	addAttributes() {
+		return {
+			...this.parent?.(),
+			commentId: {
+				default: null,
+				parseHTML: (element: HTMLElement) => {
+					const raw = element.getAttribute('data-comment-id')
+					if (raw === null) {
+						return null
+					}
+					const id = Number(raw)
+					if (!Number.isInteger(id) || id <= 0) {
+						return null
+					}
+					return id
+				},
+				renderHTML: (attributes) => {
+					if (attributes.commentId === null || attributes.commentId === undefined) {
+						return {}
+					}
+					return {
+						'data-comment-id': String(attributes.commentId),
+					}
+				},
+			},
+		}
+	},
+})