fix(devtools): avoid direct import.meta access in rspack

[Nsttt]

Summary

Closes #348

• switch import.meta?.env usages in devtools runtime code to property access (import.meta.env?.*)
• keep behavior unchanged while avoiding rspack's direct import.meta parser warning path
• add a regression test that scans packages/devtools/src and fails on direct import.meta forms (import.meta?., typeof import.meta, = import.meta)

Why

Rspack warns on direct import.meta access:

Critical dependency: Accessing import.meta directly is unsupported (only property access or destructuring is supported)

This change hardens devtools source against those patterns.

Validation

• pnpm --filter @tanstack/devtools test:eslint
• pnpm --filter @tanstack/devtools test:lib
• pnpm nx run @tanstack/devtools:build
• pnpm --filter @tanstack/devtools test:types
• pnpm --filter @tanstack/devtools test:build

[changeset-bot]

🦋 Changeset detected

Latest commit: 796db7c

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 5 packages

Name	Type
@tanstack/devtools	Patch
@tanstack/preact-devtools	Patch
@tanstack/react-devtools	Patch
@tanstack/solid-devtools	Patch
@tanstack/vue-devtools	Patch

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[Copilot]

Pull request overview

This PR fixes Rspack compatibility issues by avoiding direct import.meta access patterns that trigger Rspack parser warnings. The changes move optional chaining from import.meta itself to its properties (e.g., import.meta?.env → import.meta.env?.), maintaining the same runtime behavior while satisfying Rspack's requirement for property-only access.

Changes:

• Replaced import.meta?.env with import.meta.env?. in two locations to avoid direct import.meta access
• Added a regression test that scans source files and fails on forbidden patterns: import.meta?., typeof import.meta, and = import.meta

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
packages/devtools/tests/import-meta-compat.test.ts	New test file that recursively scans src/ for forbidden import.meta patterns to prevent regressions
packages/devtools/src/core.tsx	Changed import.meta?.env?.SSR to import.meta.env?.SSR for Rspack compatibility
packages/devtools/src/components/source-inspector.tsx	Changed import.meta?.env?.BASE_URL to import.meta.env?.BASE_URL for Rspack compatibility

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