feat(tui): use OSC 8 hyperlinks in Markdown when terminal supports them (#3248)

TerminalCapabilities already tracks hyperlinks: boolean and returns true
for Ghostty, Kitty, WezTerm, and iTerm2, but nothing generated OSC 8
sequences. This completes that stub.

Changes to packages/tui:
- terminal-image.ts: add hyperlink(text, url) and setCapabilities()
- index.ts: export hyperlink and setCapabilities
- utils.ts: extend AnsiCodeTracker to track active OSC 8 URLs
  - process() now handles OSC 8 open/close sequences
  - getActiveCodes() re-emits the OSC 8 open at each line start
  - getLineEndReset() closes the OSC 8 hyperlink before each line break
  This ensures hyperlinks wrap correctly across multiple lines.
- components/markdown.ts: link renderer uses hyperlink() when
  getCapabilities().hyperlinks is true; falls back to (url) text
- Tests: new wrap-ansi tests for OSC 8 line-wrapping; terminal-image
  tests for hyperlink(); markdown tests covering both code paths;
  table-cell width test pinned to hyperlinks:false (checks raw columns)

closes #3239

Co-authored-by: AI (Pi/Claude Sonnet 4.6) <noreply@pi.dev>
Co-authored-by: Mario Zechner <badlogicgames@gmail.com>

packages/tui/test/terminal-image.test.ts

@@ -4,7 +4,7 @@
 
 import assert from "node:assert";
 import { describe, it } from "node:test";
-import { isImageLine } from "../src/terminal-image.js";
+import { hyperlink, isImageLine } from "../src/terminal-image.js";
 
 describe("isImageLine", () => {
 	describe("iTerm2 image protocol", () => {
@@ -151,3 +151,29 @@ describe("isImageLine", () => {
 		});
 	});
 });
+
+describe("hyperlink", () => {
+	it("wraps text in OSC 8 open and close sequences", () => {
+		const result = hyperlink("click me", "https://example.com");
+		assert.strictEqual(result, "\x1b]8;;https://example.com\x1b\\click me\x1b]8;;\x1b\\");
+	});
+
+	it("preserves ANSI styling inside the hyperlink", () => {
+		const styled = "\x1b[4m\x1b[34mclick me\x1b[0m";
+		const result = hyperlink(styled, "https://example.com");
+		assert.ok(result.startsWith("\x1b]8;;https://example.com\x1b\\"));
+		assert.ok(result.includes(styled));
+		assert.ok(result.endsWith("\x1b]8;;\x1b\\"));
+	});
+
+	it("works with empty text", () => {
+		const result = hyperlink("", "https://example.com");
+		assert.strictEqual(result, "\x1b]8;;https://example.com\x1b\\\x1b]8;;\x1b\\");
+	});
+
+	it("works with file:// URIs", () => {
+		const result = hyperlink("README.md", "file:///home/user/README.md");
+		assert.ok(result.includes("file:///home/user/README.md"));
+		assert.ok(result.includes("README.md"));
+	});
+});