M6: lightweight markdown rendering on note cards

Render a small Markdown subset in the read view — headings (#..###), bullet/ordered lists, blockquote, fenced code, and inline **bold** / *italic* / `code` — alongside the existing [[wiki-links]] (task 1905). Capture stays plain text; only the card render is formatted.

Hand-rolled dependency-free parser (notes/markdown.ts) rendered as Vue vnodes (MarkdownText/MarkdownInline), never v-html, so there is no HTML-injection surface — matches the no-heavy-dep ethos. Headings require '# ' (space), so a #tag (no space) stays plain text and is never mistaken for a heading; the two coexist. Replaces LinkedText (links-only) on the card; LinkedText deleted.

Pure frontend — no backend/DB/migration.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FRgehjoz7Yv8LkUfADxACm

frontend/src/components/MarkdownInline.vue

@@ -0,0 +1,47 @@
+<script setup lang="ts">
+import { useRouter } from "vue-router";
+import { useNotesStore } from "../stores/notes";
+import { useTitlesStore } from "../stores/titles";
+import type { InlineToken } from "../notes/markdown";
+
+defineProps<{ tokens: InlineToken[] }>();
+
+const router = useRouter();
+const notes = useNotesStore();
+const titles = useTitlesStore();
+
+// A [[wiki-link]] on the card: resolve the title and open the target note (creating
+// it first if it doesn't exist), via the board's ?open=<id> mechanism.
+async function follow(title: string) {
+  await titles.load();
+  let hit = titles.resolve(title);
+  if (!hit) {
+    const created = await notes.createTitled(title);
+    await titles.reload();
+    hit = { id: created.id, title: created.title ?? title };
+  }
+  void router.push({ path: "/", query: { open: hit.id } });
+}
+</script>
+
+<!-- Rendered tightly (no whitespace between tokens) so a token's own leading/trailing
+     spaces are preserved and no extra spaces are introduced. -->
+<template
+  ><template v-for="(t, i) in tokens" :key="i"
+    ><span
+      v-if="t.type === 'link'"
+      role="link"
+      tabindex="0"
+      class="cursor-pointer font-medium text-brand-700 underline-offset-2 hover:underline dark:text-brand"
+      @click.stop="follow(t.value)"
+      @keydown.enter.stop.prevent="follow(t.value)"
+      >{{ t.value }}</span
+    ><strong v-else-if="t.type === 'bold'" class="font-semibold">{{ t.value }}</strong
+    ><em v-else-if="t.type === 'italic'">{{ t.value }}</em
+    ><code
+      v-else-if="t.type === 'code'"
+      class="rounded bg-black/5 px-1 py-0.5 font-mono text-[0.85em] dark:bg-white/10"
+      >{{ t.value }}</code
+    ><template v-else>{{ t.value }}</template></template
+  ></template
+>