feat: render research Markdown and navigate citations to deck posts

src/features/research/research-panel.css

@@ -229,3 +229,62 @@
     width: 100%;
   }
 }
+.research-markdown {
+  min-width: 0;
+  overflow-wrap: anywhere;
+}
+.research-message .research-markdown p {
+  white-space: normal;
+}
+.research-markdown h3,
+.research-markdown h4,
+.research-markdown h5,
+.research-markdown h6 {
+  font-size: 1em;
+  margin: 1em 0 0.4em;
+}
+.research-markdown ul,
+.research-markdown ol {
+  padding-left: 1.4rem;
+}
+.research-markdown li + li {
+  margin-top: 0.25rem;
+}
+.research-markdown blockquote {
+  margin: 0.75rem 0;
+  padding-left: 0.75rem;
+  border-left: 2px solid var(--control-border);
+  color: var(--secondary);
+}
+.research-markdown pre {
+  max-width: 100%;
+  overflow-x: auto;
+  padding: 0.75rem;
+  background: var(--canvas);
+  white-space: pre;
+  font-size: 0.75rem;
+}
+.research-markdown code {
+  overflow-wrap: anywhere;
+}
+.research-markdown-table {
+  overflow-x: auto;
+  max-width: 100%;
+  margin: 0.75rem 0;
+}
+.research-markdown table {
+  border-collapse: collapse;
+  width: 100%;
+  font-size: 0.75rem;
+}
+.research-markdown th,
+.research-markdown td {
+  border: 1px solid var(--border);
+  padding: 0.4rem;
+  text-align: left;
+}
+.research-markdown a {
+  color: var(--accent);
+  text-decoration: underline;
+  text-underline-offset: 0.15em;
+}