fix: handle mobile INI editing and silence timeout cleanup

Map INI to the CodeMirror properties language and fall back to plain text for unsupported modes. Reap the timeout watchdog immediately under stderr redirection to prevent Bash job notifications during cleanup.

Refs #3095, #3096

test/back/task-timeout-cleanup.test.cjs

@@ -0,0 +1,34 @@
+const assert = require('node:assert/strict');
+const fs = require('node:fs');
+const path = require('node:path');
+const { spawnSync } = require('node:child_process');
+const test = require('node:test');
+
+const source = fs.readFileSync(
+  path.resolve(__dirname, '../../shell/task-timeout.sh'),
+  'utf8',
+);
+
+test('timed task cleanup preserves output and exit codes without Bash job notifications', () => {
+  const result = spawnSync(
+    process.env.QL_TEST_BASH || '/bin/bash',
+    [
+      '-c',
+      source +
+        `
+      command_timeout_time=1h
+      for code in 0 7 0 7 0 7 0 7 0 7; do
+        # Keep a descendant alive after the task leader exits so cleanup must
+        # terminate the worker group as well as the sleeping watchdog.
+        run_task_command bash -c 'sleep 10 & echo TASK_OUTPUT; echo TASK_ERROR >&2; exit "$1"' task "$code"
+        actual=$?
+        [[ $actual == "$code" ]] || exit 99
+      done
+    `,
+    ],
+    { encoding: 'utf8', timeout: 15000 },
+  );
+  assert.equal(result.status, 0, result.stderr);
+  assert.equal(result.stdout, 'TASK_OUTPUT\n'.repeat(10));
+  assert.equal(result.stderr, 'TASK_ERROR\n'.repeat(10));
+});