chore(release): prepare 0.40.1

[elkaix]

Summary

Hotfix release for Windows/Linux native installer regressions introduced in 0.40.0:

• Web UI 404 on / in native installers. Installer CI froze the app without building the gitignored web/vis frontend bundles. Both windows-installer.yml and linux-installer.yml now build the bundles before PyInstaller. Every spec aborts loudly on missing assets. Apps serve an explanatory 503 page as last-resort fallback.
• Startup banner crashes on legacy Windows code pages. print_banner() now uses the existing ASCII-glyph detection with width-preserving fallbacks and per-line degradation instead of raising UnicodeEncodeError on cp1252/redirected stdout.

pip/wheel installs (PyPI) were never affected — this only impacts users on the native Windows installer or Linux .deb/.rpm packages.

Test plan

• All local gates pass: check_version_tag, README grep, CHANGELOG grep, check_pythinker_dependency_versions, test_installation_docs, test_homebrew_formula
• Required CI checks green before merge
• After merge: squash-merge, pull main, push v0.40.1 tag to trigger release workflow

Summary by CodeRabbit

• Bug Fixes

  • Fixed native Windows and Linux installers to prevent web UI 404 errors on the root path when bundled assets are unavailable.
  • Improved startup banner rendering on legacy Windows consoles with ASCII fallback support.

• Documentation

  • Updated installation and upgrade documentation for version 0.40.1 release.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 2d7b17e and fc76c8e.

⛔ Files ignored due to path filters (1)

• uv.lock is excluded by !**/*.lock

📒 Files selected for processing (7)

• CHANGELOG.md
• README.md
• docs/en/guides/getting-started.md
• docs/en/release-notes/breaking-changes.md
• docs/en/release-notes/changelog.md
• packages/linux-installer/README.md
• pyproject.toml

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📝 Walkthrough

Walkthrough

This PR releases version 0.40.1, a patch addressing two bugs: native installer handling for missing bundled web assets and legacy Windows console rendering. The project version is updated in pyproject.toml, release notes are added across changelog and breaking-changes documentation, and all user-facing installation guides reference the new version's artifacts.

Changes

0.40.1 Release Documentation

Layer / File(s)	Summary
Project version declaration pyproject.toml	Version is bumped from 0.40.0 to 0.40.1 in the project metadata.
Release notes and changelog entries CHANGELOG.md, docs/en/release-notes/breaking-changes.md, docs/en/release-notes/changelog.md	CHANGELOG.md adds the new 0.40.1 release section with upgrade instructions. Release-notes/breaking-changes.md declares no breaking changes relative to 0.40.0. Release-notes/changelog.md provides detailed notes on the web UI 404 fix and Windows console rendering improvements.
Installation and getting-started guides README.md, docs/en/guides/getting-started.md, packages/linux-installer/README.md	README.md updates the "What's New" section, all Windows installer artifact names to PythinkerSetup-0.40.1.exe, Linux .deb/.rpm download URLs and filenames, and checksum verification examples. Getting-started.md updates the Windows manual download filename. Linux-installer/README.md updates end-user install commands and build instructions to reference v0.40.1 packages and artifacts.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

Possibly related PRs

• Pythoughts-labs/pythinker-code#113: Prior release-version bump (0.39.0 → 0.40.0) updating the same files with different version targets.
• Pythoughts-labs/pythinker-code#86: Earlier release bump updating pyproject.toml and changelog/README version references.
• Pythoughts-labs/pythinker-code#101: Release-version bump updating the same release documentation and installer artifact references.

Suggested labels

bug, documentation

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	Title follows conventional commits format with valid 'chore' type and clear scope 'release', accurately describing the version bump to 0.40.1.
Description check	✅ Passed	PR description provides detailed context, fix descriptions, and test plan checklist, covering the main sections required by the template structure.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch release/0.40.1

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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