fix(preset): keep lazy handlers code-split in dev

[jibin7jose]

Description

This PR fixes an issue where an import-time error in a single lazy route handler takes down the entire dev server and breaks unrelated routes with a misleading Cannot access '<x>' before initialization error.

Cause:
The nitro-dev preset was setting inlineDynamicImports: true. This caused Rollup to inline all lazy handler bodies into the single index.mjs startup bundle. An error evaluating one route would abort the execution of the bundle, leaving subsequent routes permanently in the Temporal Dead Zone (TDZ).

Fix:
We've set inlineDynamicImports: false in the nitro-dev preset. This ensures lazy handlers remain code-split during local development, so an import-time failure in one module will not disrupt the evaluation of the rest of the server or other routes. When a broken route is accessed, the dev server will now accurately report the original initialization error.

Fixes #4435

[vercel]

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[coderabbitai]

📝 Walkthrough

Walkthrough

The Nitro dev preset changes inlineDynamicImports from true to false; all other preset wiring and outputs remain unchanged.

Changes

Nitro dev preset

Layer / File(s)	Summary
Dynamic import configuration src/presets/_nitro/nitro-dev.ts	Sets inlineDynamicImports to false in the dev preset.

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
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.
Title check	✅ Passed	The title follows conventional commit format and clearly describes the dev code-splitting fix.
Description check	✅ Passed	The description matches the changeset and explains the nitro-dev inlineDynamicImports change.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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