feat: install the latest mobilewright and write files only after install

[gmegidish]

Summary

Follows create-playwright for two onboarding issues.

No more pinned mobilewright version. Instead of writing 0.0.58 into package.json, the scaffolder runs npm install --save-dev mobilewright@latest @mobilewright/test@latest. A new mobilewright release reaches new users without a create-mobilewright release, including users stuck on an older scaffolder in the npx cache.

• @latest is explicit: with a bare name npm keeps an existing range, so ^0.0.45 was never upgraded (verified).
• A package already under dependencies is upgraded there (--save-prod), not duplicated into devDependencies.
• workspace:, file:, link: and git/url specs are never replaced.
• TypeScript projects get @types/node@^<published major for the running node> and typescript only when missing.

Install before writing files. Same order as create-playwright: create package.json if needed → install → write mobilewright.config.*, example test, tsconfig, .gitignore, test script. A failed install exits with "No test files were created; fix the error above and run npm init mobilewright@latest again." A blank package.json is replaced so npm doesn't fail with EJSONPARSE.

Test plan

• npm test (53 tests): install plan for new TS/JS projects, upgrades, dependencies vs devDependencies, workspace/file specs, existing @types/node/typescript, quoted install commands, no input mutation
• npm run lint, npm run build
• End-to-end with built dist:
  • empty TS project → mobilewright ^0.0.59, typescript ^7.0.2, test --list and tsc --noEmit pass
  • existing ^0.0.45 in dependencies + devDependencies → both upgraded to ^0.0.59 in place, --list passes
  • unreachable registry → exit 1, only package.json created
  • NODE_ENV=production → dev dependencies installed, --list passes

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Walkthrough

The change replaces package metadata mutation with planInstall and installCommands. Registry-backed Mobilewright packages use @latest, while non-registry specifications remain unchanged. TypeScript projects receive missing TypeScript packages. Dependency installation now occurs after test-directory validation and before project files are written. Failed installation stops scaffolding. Tests cover planning, command generation, immutability, and installation ordering.

Priority: ⬇️ Low

Merge Risk: ⚪ Minimal · up to 2ebc8

Dependency installation is planned before scaffolding, and failed installs stop generation cleanly. No concrete merge-blocking risk was found.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 13.33% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 15 functions across 3 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main changes: installing the latest Mobilewright version and delaying file creation until installation succeeds.
Description check	✅ Passed	The description directly explains the dependency installation changes, install-before-write behavior, failure handling, and test coverage.
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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Actionable comments posted: 1

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Inline comments:
In `@src/project.ts`:
- Line 44: The NON_REGISTRY_SPEC classification used by planInstall must
recognize all supported npm Git specifications, including SSH scp syntax,
gitlab:, bitbucket:, gist:, and owner/repo shorthand, so custom builds are never
replaced with registry versions. Prefer the existing npm package-spec parser if
available; otherwise extend NON_REGISTRY_SPEC, and add regression coverage for
each listed form while preserving current registry-spec handling.

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