send links to the LLM as markdown so drafts keep real hyperlinks

Transcripts flattened links to "text ( url )", so the model copied that shape and drafts came back with the URL in brackets instead of a link. HTML to text for the LLM now writes "[text](url)", which Markdown2HTML turns back into an anchor.

internal/stringutil/stringutil_test.go

@@ -297,16 +297,16 @@ func TestSplitName(t *testing.T) {
 	}
 }
 
-func TestHTML2TextWithLinks(t *testing.T) {
+func TestHTML2TextMarkdownLinks(t *testing.T) {
 	tests := []struct {
 		name string
 		html string
 		want string
 	}{
 		{
-			name: "link with distinct text keeps url",
+			name: "link with distinct text becomes a markdown link",
 			html: `<p>See <a href="https://example.com/guide">the guide</a> for steps.</p>`,
-			want: "See the guide ( https://example.com/guide ) for steps.",
+			want: "See [the guide](https://example.com/guide) for steps.",
 		},
 		{
 			name: "link text equal to url not duplicated",
@@ -318,10 +318,30 @@ func TestHTML2TextWithLinks(t *testing.T) {
 			html: `<p>No links here.</p>`,
 			want: "No links here.",
 		},
+		{
+			name: "nested markup inside the anchor flattens to link text",
+			html: `<p><a href="https://example.com/x"><strong>Pay</strong> now</a></p>`,
+			want: "[Pay now](https://example.com/x)",
+		},
+		{
+			name: "brackets in link text are escaped",
+			html: `<p><a href="https://example.com">Docs [beta]</a></p>`,
+			want: `[Docs \[beta\]](https://example.com)`,
+		},
+		{
+			name: "url with parentheses is wrapped in angle brackets",
+			html: `<p><a href="https://example.com/a(b)">See</a></p>`,
+			want: "[See](<https://example.com/a(b)>)",
+		},
+		{
+			name: "anchor without href keeps its text",
+			html: `<p><a name="top">Top</a> of page.</p>`,
+			want: "Top of page.",
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			if got := HTML2TextWithLinks(tt.html); got != tt.want {
+			if got := HTML2TextMarkdownLinks(tt.html); got != tt.want {
 				t.Errorf("got %q, want %q", got, tt.want)
 			}
 		})