fix(notes): show raw-text fallback when markdown render fails

A throwing markdown-it plugin propagated uncaught and left the note
silently blank. Wrap the central render in try/catch and degrade to the
note's escaped raw text with a gentle notice, so content stays readable.

src/hooks/useMarkdown.hook.ts

@@ -25,6 +25,7 @@ import {
 } from "@/utils/decodeBase64ToUTF8"
 import { html5Media } from "@/utils/markdown/markdown-html5-media"
 import { markdownItTablerIcons } from "@/utils/markdown/markdown-it-tabler-icons"
+import { renderFallback } from "@/utils/markdown/renderFallback"
 
 const TIKZ_BUNDLE_URL =
   "https://cdn.jsdelivr.net/gh/artisticat1/obsidian-tikzjax@0.5.2/tikzjax.js"
@@ -399,7 +400,14 @@ const renderMarkdown = (content: string, env?: Record<string, unknown>) => {
   // unhighlighted because nothing else invalidates the computed.
   if (content.includes("```")) void shikijiReady.value
   slugger.reset()
+  try {
     return env ? md.render(content, env) : md.render(content)
+  } catch (error) {
+    // Never let a plugin failure blank the note or dump a raw error —
+    // degrade to the note's raw text.
+    console.error("markdown render failed", error)
+    return renderFallback(content)
+  }
 }
 
 export const renderCodeFile = async ({

src/utils/markdown/renderFallback.spec.ts

@@ -0,0 +1,26 @@
+import { describe, expect, it } from "vitest"
+
+import { renderFallback } from "./renderFallback"
+
+describe("renderFallback", () => {
+  it("shows the raw content inside a pre with a gentle notice", () => {
+    const html = renderFallback("# hello")
+
+    expect(html).toContain("note-render-fallback")
+    expect(html).toContain("couldn't be fully rendered")
+    expect(html).toContain("<pre># hello</pre>")
+  })
+
+  it("escapes HTML so raw content can't inject markup into v-html", () => {
+    const html = renderFallback('<img src=x onerror="alert(1)"> & "q"')
+
+    expect(html).toContain(
+      "&lt;img src=x onerror=&quot;alert(1)&quot;&gt; &amp; &quot;q&quot;"
+    )
+    expect(html).not.toContain("<img src=x")
+  })
+
+  it("escapes ampersands before other entities", () => {
+    expect(renderFallback("&lt;")).toContain("<pre>&amp;lt;</pre>")
+  })
+})

src/utils/markdown/renderFallback.ts

@@ -0,0 +1,14 @@
+const escapeHtml = (value: string): string =>
+  value
+    .replaceAll("&", "&")
+    .replaceAll("<", "&lt;")
+    .replaceAll(">", "&gt;")
+    .replaceAll('"', "&quot;")
+
+/**
+ * Calm degradation for a note that failed to render: never a raw error dump
+ * or a silent blank — show the note's raw text (escaped) with a gentle notice,
+ * so the content is still readable.
+ */
+export const renderFallback = (content: string): string =>
+  `<div class="note-render-fallback"><p><em>This note couldn't be fully rendered — showing its raw text.</em></p><pre>${escapeHtml(content)}</pre></div>`