fix: output named links as [label](url) in logged-in Telegram fetcher

Aligns applyTextURLEntities with the public HTML fetcher so both modes
produce the same markdown link format for the client-side linkify renderer.

internal/server/feed_test.go

@@ -114,7 +114,7 @@ func TestApplyTextURLEntities(t *testing.T) {
 			entities: []tg.MessageEntityClass{
 				&tg.MessageEntityTextURL{Offset: 10, Length: 9, URL: "https://example.com"},
 			},
-			want: "Check out this link (https://example.com) for details",
+			want: "Check out [this link](https://example.com) for details",
 		},
 		{
 			name: "display text equals url",
@@ -139,7 +139,7 @@ func TestApplyTextURLEntities(t *testing.T) {
 				&tg.MessageEntityTextURL{Offset: 4, Length: 5, URL: "https://one.com"},
 				&tg.MessageEntityTextURL{Offset: 14, Length: 6, URL: "https://two.com"},
 			},
-			want: "see first (https://one.com) and second (https://two.com) links",
+			want: "see [first](https://one.com) and [second](https://two.com) links",
 		},
 		{
 			name: "emoji in text (surrogate pair)",
@@ -147,7 +147,7 @@ func TestApplyTextURLEntities(t *testing.T) {
 			entities: []tg.MessageEntityClass{
 				&tg.MessageEntityTextURL{Offset: 3, Length: 10, URL: "https://poll.com"},
 			},
-			want: "📊 click here (https://poll.com)",
+			want: "📊 [click here](https://poll.com)",
 		},
 		{
 			name: "non-text-url entities ignored",

internal/server/public_test.go

@@ -196,7 +196,7 @@ func TestExtractMessageTextPreservesLinks(t *testing.T) {
 	}
 	node := findFirstByClass(doc, "tgme_widget_message_text")
 	text := extractMessageText(node)
-	want := "Check out this link (https://example.com) for details"
+	want := "Check out [this link](https://example.com) for details"
 	if text != want {
 		t.Fatalf("extractMessageText = %q, want %q", text, want)
 	}

internal/server/telegram.go

@@ -466,7 +466,7 @@ func (tr *TelegramReader) extractText(msg *tg.Message) string {
 }
 
 // applyTextURLEntities embeds hyperlink URLs from MessageEntityTextURL entities
-// into the message text, producing output like "display text (https://url)".
+// into the message text, producing output like "[display text](https://url)".
 // This mirrors what the public HTML reader does when it extracts <a> tags.
 // Offsets are in UTF-16 code units per the Telegram API spec.
 func applyTextURLEntities(text string, entities []tg.MessageEntityClass) string {
@@ -519,10 +519,11 @@ func applyTextURLEntities(text string, entities []tg.MessageEntityClass) string
 		if string(runes[startIdx:endIdx]) == u.url {
 			continue
 		}
-		ins := []rune(" (" + u.url + ")")
-		newRunes := make([]rune, 0, len(runes)+len(ins))
-		newRunes = append(newRunes, runes[:endIdx]...)
-		newRunes = append(newRunes, ins...)
+		label := string(runes[startIdx:endIdx])
+		replacement := []rune("[" + label + "](" + u.url + ")")
+		newRunes := make([]rune, 0, len(runes)-len([]rune(label))+len(replacement))
+		newRunes = append(newRunes, runes[:startIdx]...)
+		newRunes = append(newRunes, replacement...)
 		newRunes = append(newRunes, runes[endIdx:]...)
 		runes = newRunes
 	}