chore: bump version to 3.18.0 (TripoSG image-to-3D release)

[fernandotonon]

Bumps the version to 3.18.0 so the TripoSG image→3D backend + describe-then-generate texturing (PR #794) ships under a fresh version. 3.17.0 was already released on 2026-07-04, before #794 merged.

• CMakeLists.txt VERSION → 3.18.0 (single source of truth)
• README.md + website hook doc pins synced via scripts/sync-doc-versions-from-cmake.sh (CI verify-doc-versions will pass)

After merge: tag 3.18.0 + publish the GitHub Release to trigger the deploy pipeline (Homebrew/WinGet/Snap/Docker).

🤖 Generated with Claude Code

Summary by CodeRabbit

• Chores
  • Updated the project and documented CI references from version 3.17.0 to 3.18.0.
  • Refreshed the default version used when falling back to a pinned action reference.
  • Aligned README examples so build and workflow snippets point to the latest release.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 5f2c65bf-c7b8-46c9-8c1c-8cf663f0bc8a

📥 Commits

Reviewing files that changed from the base of the PR and between 62b0c61 and 87a047a.

📒 Files selected for processing (3)

• CMakeLists.txt
• README.md
• website/src/hooks/useQtmeshActionRef.js

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📝 Walkthrough

Walkthrough

This PR bumps the QtMeshEditor version from 3.17.0 to 3.18.0 in CMakeLists.txt's project declaration, and synchronizes all pinned version references in README.md CI examples and the website's fallback action ref constant.

Changes

Version Bump to 3.18.0

Layer / File(s)	Summary
Core version declaration CMakeLists.txt	Project version incremented from 3.17.0 to 3.18.0, updating ${PROJECT_VERSION}.
Documentation and action ref sync README.md, website/src/hooks/useQtmeshActionRef.js	README CI/CD instructions and all example YAML snippets (uses: and image-tag values) updated to 3.18.0; QTMESH_ACTION_REF_FALLBACK constant updated to match.

Estimated code review effort: 1 (Trivial) | ~3 minutes

Possibly related PRs

• fernandotonon/QtMeshEditor#495: Same pattern of version-sync updates across CMakeLists.txt, README, and useQtmeshActionRef.js.
• fernandotonon/QtMeshEditor#770: Same version-pinning points updated (CMakeLists.txt, README CI examples, QTMESH_ACTION_REF_FALLBACK) for a different version bump.
• fernandotonon/QtMeshEditor#693: Same version-pin update pattern across the same files.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and accurately summarizes the main change: bumping the project version to 3.18.0.
Description check	✅ Passed	The description covers the summary and technical details, and only misses the template's exact section headings/checkboxes.
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.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/bump-3.18.0

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud