chore: add changelog fragment for subtitle sidebar changes

- Add `subtitleSidebar.autoOpen` with startup-only open behavior
- Jump to the first resolved active cue on initial resume position
- Clear parsed cues when subtitle prefetch init fails

scripts/build-changelog.test.ts

@@ -95,43 +95,6 @@ test('writeChangelogArtifacts ignores README, groups fragments by type, writes r
   }
 });
 
-test('writeChangelogArtifacts skips changelog prepend when release section already exists', async () => {
-  const { writeChangelogArtifacts } = await loadModule();
-  const workspace = createWorkspace('write-artifacts-existing-version');
-  const projectRoot = path.join(workspace, 'SubMiner');
-  const existingChangelog = [
-    '# Changelog',
-    '',
-    '## v0.4.1 (2026-03-07)',
-    '### Added',
-    '- Existing release bullet.',
-    '',
-  ].join('\n');
-
-  fs.mkdirSync(projectRoot, { recursive: true });
-  fs.mkdirSync(path.join(projectRoot, 'changes'), { recursive: true });
-  fs.writeFileSync(path.join(projectRoot, 'CHANGELOG.md'), existingChangelog, 'utf8');
-  fs.writeFileSync(path.join(projectRoot, 'changes', '001.md'), ['type: added', 'area: overlay', '', '- Stale release fragment.'].join('\n'), 'utf8');
-
-  try {
-    const result = writeChangelogArtifacts({
-      cwd: projectRoot,
-      version: '0.4.1',
-      date: '2026-03-08',
-    });
-
-    assert.deepEqual(result.deletedFragmentPaths, [path.join(projectRoot, 'changes', '001.md')]);
-    assert.equal(fs.existsSync(path.join(projectRoot, 'changes', '001.md')), false);
-
-    const changelog = fs.readFileSync(path.join(projectRoot, 'CHANGELOG.md'), 'utf8');
-    assert.equal(changelog, existingChangelog);
-    const releaseNotes = fs.readFileSync(path.join(projectRoot, 'release', 'release-notes.md'), 'utf8');
-    assert.match(releaseNotes, /## Highlights\n### Added\n- Existing release bullet\./);
-  } finally {
-    fs.rmSync(workspace, { recursive: true, force: true });
-  }
-});
-
 test('verifyChangelogReadyForRelease ignores README but rejects pending fragments and missing version sections', async () => {
   const { verifyChangelogReadyForRelease } = await loadModule();
   const workspace = createWorkspace('verify-release');

scripts/build-changelog.ts

@@ -341,34 +341,12 @@ export function writeChangelogArtifacts(options?: ChangelogOptions): {
   const version = resolveVersion(options ?? {});
   const date = resolveDate(options?.date);
   const fragments = readChangeFragments(cwd, options?.deps);
+  const releaseSection = buildReleaseSection(version, date, fragments);
   const existingChangelogPath = path.join(cwd, 'CHANGELOG.md');
   const existingChangelog = existsSync(existingChangelogPath)
     ? readFileSync(existingChangelogPath, 'utf8')
     : '';
   const outputPaths = resolveChangelogOutputPaths({ cwd });
-  const existingReleaseSection = extractReleaseSectionBody(existingChangelog, version);
-  if (existingReleaseSection !== null) {
-    log(`Existing section found for v${version}; skipping changelog prepend.`);
-    for (const fragment of fragments) {
-      rmSync(fragment.path);
-      log(`Removed ${fragment.path}`);
-    }
-
-    const releaseNotesPath = writeReleaseNotesFile(
-      cwd,
-      existingReleaseSection,
-      options?.deps,
-    );
-    log(`Generated ${releaseNotesPath}`);
-
-    return {
-      deletedFragmentPaths: fragments.map((fragment) => fragment.path),
-      outputPaths,
-      releaseNotesPath,
-    };
-  }
-
-  const releaseSection = buildReleaseSection(version, date, fragments);
   const nextChangelog = prependReleaseSection(existingChangelog, releaseSection, version);
 
   for (const outputPath of outputPaths) {