fix(router-generator): keep dotted pathless layout filenames as one segment

[thribhuvan003]

virtual layout() with a dotted filename like pathless.layout.tsx was turning the layout id into /_pathless/layout, so kids got mounted under a real /layout URL segment instead of staying at /subpath. dots in layout ids are part of the filename, not path separators - escape them before determineInitialRoutePath so the id stays one pathless segment. generator fixture covers it (fullPaths stays / and /subpath).

Fixes #7761.

Summary by CodeRabbit

• Bug Fixes

  • Fixed route generation for virtual pathless layouts with dotted filenames.
  • Dots in layout filenames are now preserved as part of the layout name instead of creating unintended URL path segments.
  • Child routes now retain their intended paths when nested under these layouts.

• Tests

  • Added coverage for dotted virtual pathless layout filenames and nested child routes.

[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: 91795793-468b-4341-ab2c-51a2625c0ebc

📥 Commits

Reviewing files that changed from the base of the PR and between a3e24c3 and 2c215e1.

📒 Files selected for processing (8)

• .changeset/virtual-pathless-layout-dotted-filename.md
• packages/router-generator/src/filesystem/virtual/getRouteNodes.ts
• packages/router-generator/tests/generator.test.ts
• packages/router-generator/tests/generator/virtual-pathless-layout-dotted-filename/routeTree.snapshot.ts
• packages/router-generator/tests/generator/virtual-pathless-layout-dotted-filename/routes/index.route.tsx
• packages/router-generator/tests/generator/virtual-pathless-layout-dotted-filename/routes/pathless.layout.tsx
• packages/router-generator/tests/generator/virtual-pathless-layout-dotted-filename/routes/root.route.tsx
• packages/router-generator/tests/generator/virtual-pathless-layout-dotted-filename/routes/subpath.route.tsx

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📝 Walkthrough

Walkthrough

Updates virtual route generation so dotted pathless layout IDs remain single segments, and adds a regression fixture with generated route-tree coverage plus a patch changeset.

Changes

Virtual pathless layout path handling

Layer / File(s)	Summary
Escape dotted layout IDs packages/router-generator/src/filesystem/virtual/getRouteNodes.ts	Layout IDs now escape unbracketed dots before initial route path determination.
Validate generated dotted layout routes packages/router-generator/tests/generator.test.ts, packages/router-generator/tests/generator/virtual-pathless-layout-dotted-filename/*, .changeset/virtual-pathless-layout-dotted-filename.md	Adds a virtual route configuration, root/layout/index/subpath fixtures, generated route-tree wiring and types, and a patch changeset for dotted pathless layouts.

Estimated code review effort: 2 (Simple) | ~10 minutes

Suggested labels: package: router-generator

Suggested reviewers: schiller-manuel, nlynzaad

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the dotted pathless layout filename fix in router-generator.
Linked Issues check	✅ Passed	The fix escapes dotted layout IDs and the new fixture verifies children stay reachable at /subpath, matching #7761.
Out of Scope Changes check	✅ Passed	The changes stay focused on the router-generator bug fix, related test coverage, and release note entry.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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