Upgrade all major frontend dependencies

- TipTap 2 → 3: Extension from @tiptap/core, Placeholder from
  @tiptap/extensions, TaskList/TaskItem from @tiptap/extension-list,
  link: false in StarterKit (now bundles Link), @tiptap/core added
- marked 15 → 17: heading renderer updated to tokens/parseInline API
- Pinia 2 → 3, Vue Router 4 → 5 (no code changes required)
- Vite 6 → 7, @vitejs/plugin-vue 5 → 6, vue-tsc 2 → 3
- TypeScript 5.6 → 5.9: fixed Uint8Array<ArrayBuffer> strictness in
  push.ts, removed unused bodyEl ref in NoteViewerView.vue
- .npmrc: legacy-peer-deps=true for TipTap v3 peer dep resolution

TipTap 3 new capabilities now available: static renderer
(createStaticRenderer), MarkViews, @tiptap/extensions package.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/components/TiptapEditor.vue

@@ -3,12 +3,11 @@ import { watch, onBeforeUnmount } from "vue";
 import { Editor, EditorContent } from "@tiptap/vue-3";
 import StarterKit from "@tiptap/starter-kit";
 import Link from "@tiptap/extension-link";
-import Placeholder from "@tiptap/extension-placeholder";
+import { Placeholder } from "@tiptap/extensions";
 import { marked } from "marked";
 import DOMPurify from "dompurify";
 import { serializeToMarkdown } from "@/utils/markdownSerializer";
-import TaskList from "@tiptap/extension-task-list";
-import TaskItem from "@tiptap/extension-task-item";
+import { TaskList, TaskItem } from "@tiptap/extension-list";
 import { TagDecoration } from "@/extensions/TagDecoration";
 import { WikilinkDecoration } from "@/extensions/WikilinkDecoration";
 import { WikilinkSuggestion } from "@/extensions/WikilinkSuggestion";
@@ -71,6 +70,7 @@ try {
     extensions: [
       StarterKit.configure({
         heading: { levels: [1, 2, 3, 4, 5, 6] },
+        link: false,
       }),
       Link.configure({
         openOnClick: false,

frontend/src/extensions/SlashCommands.ts

@@ -1,4 +1,4 @@
-import { Extension } from "@tiptap/vue-3";
+import { Extension } from "@tiptap/core";
 import { PluginKey } from "@tiptap/pm/state";
 import Suggestion from "@tiptap/suggestion";
 import { createSuggestionRenderer } from "./suggestionRenderer";

frontend/src/extensions/TagDecoration.ts

@@ -1,4 +1,4 @@
-import { Extension } from "@tiptap/vue-3";
+import { Extension } from "@tiptap/core";
 import { Plugin, PluginKey } from "@tiptap/pm/state";
 import { Decoration, DecorationSet } from "@tiptap/pm/view";
 

frontend/src/extensions/TagSuggestion.ts

@@ -1,4 +1,4 @@
-import { Extension } from "@tiptap/vue-3";
+import { Extension } from "@tiptap/core";
 import { PluginKey } from "@tiptap/pm/state";
 import Suggestion from "@tiptap/suggestion";
 import { createSuggestionRenderer } from "./suggestionRenderer";

frontend/src/extensions/WikilinkDecoration.ts

@@ -1,4 +1,4 @@
-import { Extension } from "@tiptap/vue-3";
+import { Extension } from "@tiptap/core";
 import { Plugin, PluginKey } from "@tiptap/pm/state";
 import { Decoration, DecorationSet } from "@tiptap/pm/view";
 

frontend/src/extensions/WikilinkSuggestion.ts

@@ -1,4 +1,4 @@
-import { Extension } from "@tiptap/vue-3";
+import { Extension } from "@tiptap/core";
 import { PluginKey } from "@tiptap/pm/state";
 import Suggestion from "@tiptap/suggestion";
 import { createSuggestionRenderer } from "./suggestionRenderer";

frontend/src/stores/push.ts

@@ -1,11 +1,12 @@
 import { defineStore } from 'pinia'
 import { ref } from 'vue'
 
-function urlBase64ToUint8Array(base64String: string): Uint8Array {
+function urlBase64ToUint8Array(base64String: string): Uint8Array<ArrayBuffer> {
   const padding = '='.repeat((4 - (base64String.length % 4)) % 4)
   const base64 = (base64String + padding).replace(/-/g, '+').replace(/_/g, '/')
   const rawData = window.atob(base64)
-  const outputArray = new Uint8Array(rawData.length)
+  const buf = new ArrayBuffer(rawData.length)
+  const outputArray = new Uint8Array<ArrayBuffer>(buf)
   for (let i = 0; i < rawData.length; ++i) {
     outputArray[i] = rawData.charCodeAt(i)
   }

frontend/src/utils/markdown.ts

@@ -1,4 +1,4 @@
-import { marked } from "marked";
+import { marked, type RendererThis, type Tokens } from "marked";
 import DOMPurify from "dompurify";
 import { linkifyTags, linkifyWikilinks } from "@/utils/tags";
 
@@ -28,7 +28,8 @@ export function stripFirstLineTags(text: string): string {
 }
 
 const headingRenderer = {
-  heading({ text, depth }: { text: string; depth: number }): string {
+  heading(this: RendererThis, { tokens, depth }: Tokens.Heading): string {
+    const text = this.parser.parseInline(tokens);
     const id = slugify(text);
     return `<h${depth} id="${id}">${text}</h${depth}>`;
   },

frontend/src/views/NoteViewerView.vue

@@ -12,7 +12,6 @@ import TableOfContents from "@/components/TableOfContents.vue";
 const route = useRoute();
 const router = useRouter();
 const store = useNotesStore();
-const bodyEl = ref<HTMLElement | null>(null);
 const backlinks = ref<{ type: string; id: number; title: string }[]>([]);
 const converting = ref(false);
 
@@ -198,7 +197,6 @@ async function convertToTask() {
           />
         </div>
         <div
-          ref="bodyEl"
           class="body prose"
           v-html="renderedBody"
           @click="onBodyClick"