Fix blank lines in saved transcripts

static/js/terminal-manager.js

@@ -878,7 +878,7 @@ const TerminalManager = {
         if (!raw) {
             return '';
         }
-        const stripped = this.stripAnsiSequences(raw);
+        const stripped = this.stripAnsiSequences(raw.replace(/\r\n/g, '\n'));
         return this.normalizeControlChars(stripped);
     },
 

tests/js/terminal-transcript.test.js

@@ -0,0 +1,32 @@
+const test = require('node:test');
+const assert = require('node:assert/strict');
+
+global.window = {addEventListener() {}, visualViewport: null};
+global.document = {};
+global.navigator = {};
+
+require('../../static/js/terminal-manager.js');
+const TerminalManager = global.window.TerminalManager;
+
+test('transcript export preserves text before CRLF line endings', () => {
+    TerminalManager.transcripts = {
+        session: ['user@host:~$ echo hello\r', '\n\x1b[32mhello\x1b[0m\r', '\nuser@host:~$ '],
+    };
+
+    assert.equal(
+        TerminalManager.getCleanTranscript('session'),
+        'user@host:~$ echo hello\nhello\nuser@host:~$ ',
+    );
+});
+
+test('transcript export still handles a lone carriage return as an overwrite', () => {
+    TerminalManager.transcripts = {session: ['Downloading 10%\rDownloading 90%\n']};
+
+    assert.equal(TerminalManager.getCleanTranscript('session'), 'Downloading 90%\n');
+});
+
+test('ANSI erase between CR and LF does not turn a cleared line into a saved line', () => {
+    TerminalManager.transcripts = {session: ['text\r', '\x1b[2K\n']};
+
+    assert.equal(TerminalManager.getCleanTranscript('session'), '\n');
+});