fix(svelte-query): suppress false positive unused import warnings

[DACONLEEHANGYU]

Fixes #9740

Added rollup onwarn handler to suppress UNUSED_EXTERNAL_IMPORT warnings for @tanstack/query-core imports. These warnings are false positives as the imports (notifyManager, replaceEqualDeep) are actually used in the compiled code but Rollup's tree-shaking analysis fails to detect this in Svelte 5's runes context ($effect, $state, $derived).

The warning appeared during SvelteKit project builds mentioning:

• notifyManager (used in createMutation.svelte.ts)
• replaceEqualDeep (used in useMutationState.svelte.ts)

🎯 Changes

✅ Checklist

• I have followed the steps in the Contributing guide.
• I have tested this code locally with pnpm run test:pr.

🚀 Release Impact

• This change affects published code, and I have generated a changeset.
• This change is docs/CI/dev-only (no release).

Summary by CodeRabbit

• Chores
  • Updated build configuration to suppress false-positive warnings during the build process, resulting in cleaner build output.

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[changeset-bot]

⚠️ No Changeset found

Latest commit: ebb6ecf

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[coderabbitai]

📝 Walkthrough

Walkthrough

A build.rollupOptions.onwarn handler was added to the Vite configuration for svelte-query. The handler filters out false-positive warnings from Rollup when external imports from @tanstack/query-core are flagged as unused, while preserving all other warnings in the build process.

Changes

Cohort / File(s)	Summary
Build configuration warning suppression packages/svelte-query/vite.config.ts	Added build.rollupOptions.onwarn handler to suppress UNUSED_EXTERNAL_IMPORT warnings from @tanstack/query-core during Rollup bundling; all other warnings pass through unchanged

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Suggested reviewers

• TkDodo

Poem

🐰 A bundle of joy, no warnings in sight,
Query imports now flow without fright,
Rollup's false alarms we gently suppress,
Svelte builds clean—pure success! ✨

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The PR description is incomplete: the 'Changes' section header is present but empty with only a placeholder comment, and neither checklist item nor release impact option is checked.	Fill in the Changes section with details about the vite.config.ts modifications and check relevant checklist/release impact items to indicate completion status.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately and concisely describes the main change: suppressing false positive unused import warnings in svelte-query.
Linked Issues check	✅ Passed	The PR directly addresses issue #9740 by implementing the rollup onwarn handler to suppress UNUSED_EXTERNAL_IMPORT warnings for @tanstack/query-core, meeting the stated requirement.
Out of Scope Changes check	✅ Passed	All changes are scoped to the stated objective: only vite.config.ts was modified to add the warning suppression handler targeting @tanstack/query-core imports.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

• 📝 Generate docstrings

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