docs(preact): add missing polling guide

[poetryofcode]

Summary

The Preact framework was missing a polling guide that all other frameworks (React, Vue, Solid) already have.

• Added docs/framework/preact/guides/polling.md using the ref: pattern to reuse the React polling guide with the package name substituted
• Added the polling entry to docs/config.json in the Preact guides section (between window-focus-refetching and disabling-queries)

Changes

• docs/framework/preact/guides/polling.md: New file referencing React polling docs
• docs/config.json: Added polling nav entry for Preact

Test plan

• Verify the polling guide renders correctly for Preact
• Check that the @tanstack/preact-query package reference is correct

Summary by CodeRabbit

• Documentation
  • Added a new Polling guide to the Preact guides navigation.
  • Updated the Preact polling guide metadata to point to the Preact-specific query package.
  • Refined a Svelte overview example to use the latest loading-state check.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 71e6b089-8939-44d1-aa1f-befffb352bc1

📥 Commits

Reviewing files that changed from the base of the PR and between d6798b5 and c205330.

📒 Files selected for processing (3)

• docs/config.json
• docs/framework/preact/guides/polling.md
• docs/framework/svelte/overview.md

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📝 Walkthrough

Walkthrough

Adds a "Polling" entry to the Preact guides navigation in docs/config.json and creates the corresponding polling.md frontmatter referencing @tanstack/preact-query. Also fixes the Svelte overview example to use query.isPending instead of query.isLoading.

Changes

Docs: Preact Polling Guide and Svelte Overview Fix

Layer / File(s)	Summary
Preact polling guide nav and frontmatter docs/config.json, docs/framework/preact/guides/polling.md	Adds a "Polling" navigation entry under Preact guides and sets the frontmatter replace alias to @tanstack/preact-query.
Svelte overview loading state fix docs/framework/svelte/overview.md	Changes {#if query.isLoading} to {#if query.isPending} in the Svelte code example.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• TanStack/query#10990: Applies the same query.isLoading → query.isPending fix to docs/framework/svelte/overview.md.
• TanStack/query#10991: Contains overlapping changes to the Preact polling guide and the Svelte overview isPending fix.

Poem

🐇 Hop hop, the polling guide is here,
Preact queries now crystal clear!
Svelte's isPending takes the stage,
Replacing isLoading on the page.
A tiny fix, a nav entry bright—
The docs bunny makes everything right! ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title is concise and accurately reflects the main change: adding the missing Preact polling guide.
Description check	✅ Passed	It summarizes the added Preact polling guide and nav entry, but omits the template's checklist and release-impact sections.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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