fix(svelte-store): preserve selector object identity

[IdrisCelik]

🎯 Changes

Updated the Svelte adapter's useSelector to initialize selected state with $state.raw(...) instead of $state(...).

This preserves raw object identity for the default strict equality comparator, preventing state_proxy_equality_mismatch warnings and unnecessary invalidations when object-valued selections have not changed.

Added regression coverage for unchanged object selections and added a patch Changeset.

Fixes #363

✅ Checklist

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

• Bug Fixes

  • Fixed object selections in useSelector so unchanged selected values preserve their identity.
  • Updates to unrelated store state no longer trigger unnecessary re-renders for object selections.

• Tests

  • Added coverage verifying selector isolation and stable render behavior.

• Chores

  • Documented the patch release for the Svelte store package.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Advanced

Run ID: ed1e0b16-dfa3-432a-8e30-930699f991d6

📥 Commits

Reviewing files that changed from the base of the PR and between 3b060e3 and b1e9b77.

📒 Files selected for processing (4)

• .changeset/svelte-selector-identity.md
• packages/svelte-store/src/useSelector.svelte.ts
• packages/svelte-store/tests/ObjectSelector.test.svelte
• packages/svelte-store/tests/index.test.ts

Included review availability: Your plan provides up to 4 included reviews per hour; 3 remain after this review.

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📝 Walkthrough

Walkthrough

useSelector now stores its initial selected value as raw state. New Svelte tests verify that updates outside the selected object do not trigger an additional render. A patch changeset records the fix.

Changes

Svelte selector identity

Layer / File(s)	Summary
Raw selector state packages/svelte-store/src/useSelector.svelte.ts	The initial selector result uses $state.raw(...) instead of $state(...).
Regression test and release metadata packages/svelte-store/tests/ObjectSelector.test.svelte, packages/svelte-store/tests/index.test.ts, .changeset/svelte-selector-identity.md	The tests verify that updating the ignored state does not increase the render count. The changeset declares a patch release for @tanstack/svelte-store.

Priority: ⬇️ Low

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

Change: Bug fix · Severity of issue fixed: Low

Merge Risk: ⚪ Minimal · up to b1e9b

The selector now preserves object identity for unchanged selections, and the added regression test covers ignored state updates. The change is ready to merge.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 2 files. (2 skipped: 2 …
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 clearly and concisely describes the main change: preserving object identity for Svelte store selectors.
Description check	✅ Passed	The description covers the change, motivation, regression tests, changeset, issue reference, checklist, and release impact. All required template sections are present and complete.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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