docs: use the dynamic README header endpoint

[AlemTuzlak]

Adopts the dynamic README header endpoint added in TanStack/tanstack.com#1076,
which is merged and live.

Every README banner in this repo now points a <picture> at
https://tanstack.com/api/readme/ instead of a committed PNG. The endpoint
renders 1800x450 in light and dark, so a branding change lands in every README
at once and dark-mode readers get a dark banner.

What changed

• 1 README(s) updated.

• Light and dark served through <picture>, per GitHub's guidance. The trailing <img> stays the light variant, as the fallback for renderers that ignore <picture> (npm, most editors).

• Deletes the now-unused media/header_db.png.

Verification

Every generated URL in this diff was requested against the live endpoint and
returned 200 image/png at 1800x450. git grep confirms no README still
references the old media/header_*.png path.

Heads up: deleting the committed PNG means npm pages for already-published
versions that embed the raw.githubusercontent.com/.../main/media/header_*.png
link will show a broken image, since that link is branch-pinned. New releases
pick up the endpoint URL.

Summary by CodeRabbit

• Documentation
  • Updated project and package README banners with responsive, theme-aware images for dark and light modes.
  • Added accessible fallback images to improve compatibility across viewing environments.
  • Improved banner presentation with centered layouts for package documentation.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: d0755f45-a72c-4fbe-b396-66d80a1679db

📥 Commits

Reviewing files that changed from the base of the PR and between be8f6c6 and 752a946.

📒 Files selected for processing (5)

• packages/angular-db/README.md
• packages/react-db/README.md
• packages/solid-db/README.md
• packages/svelte-db/README.md
• packages/vue-db/README.md

---

📝 Walkthrough

Walkthrough

README files now use responsive <picture> elements with dark- and light-theme remote images, centered banners, accessible fallback text, and responsive image metadata.

Changes

README headers

Layer / File(s)	Summary
Responsive header images README.md, packages/*/README.md	The repository and package READMEs use theme-specific banner sources and accessible fallback images. The banners include responsive layout metadata.

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

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main documentation change to use the dynamic README header endpoint.
Description check	✅ Passed	The description explains the changes, verification, and release impact, although it does not use the template's checklist headings.
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
• Commit unit tests in branch readme-header-endpoint

---

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commit: 752a946

[github-actions]

Size Change: 0 B

Total Size: 125 kB

ℹ️ View Unchanged

Filename	Size
packages/db/dist/esm/collection/change-events.js	1.43 kB
packages/db/dist/esm/collection/changes.js	1.38 kB
packages/db/dist/esm/collection/cleanup-queue.js	810 B
packages/db/dist/esm/collection/events.js	434 B
packages/db/dist/esm/collection/index.js	3.62 kB
packages/db/dist/esm/collection/indexes.js	1.99 kB
packages/db/dist/esm/collection/lifecycle.js	1.69 kB
packages/db/dist/esm/collection/mutations.js	2.47 kB
packages/db/dist/esm/collection/state.js	5.48 kB
packages/db/dist/esm/collection/subscription.js	3.74 kB
packages/db/dist/esm/collection/sync.js	2.88 kB
packages/db/dist/esm/collection/transaction-metadata.js	144 B
packages/db/dist/esm/deferred.js	207 B
packages/db/dist/esm/errors.js	5.1 kB
packages/db/dist/esm/event-emitter.js	748 B
packages/db/dist/esm/index.js	3.16 kB
packages/db/dist/esm/indexes/auto-index.js	829 B
packages/db/dist/esm/indexes/base-index.js	784 B
packages/db/dist/esm/indexes/basic-index.js	2.17 kB
packages/db/dist/esm/indexes/btree-index.js	2.29 kB
packages/db/dist/esm/indexes/index-registry.js	820 B
packages/db/dist/esm/indexes/reverse-index.js	557 B
packages/db/dist/esm/live-query-adapter.js	318 B
packages/db/dist/esm/local-only.js	916 B
packages/db/dist/esm/local-storage.js	2.12 kB
packages/db/dist/esm/optimistic-action.js	359 B
packages/db/dist/esm/paced-mutations.js	496 B
packages/db/dist/esm/proxy.js	3.75 kB
packages/db/dist/esm/query/builder/functions.js	1.47 kB
packages/db/dist/esm/query/builder/index.js	5.84 kB
packages/db/dist/esm/query/builder/ref-proxy.js	1.24 kB
packages/db/dist/esm/query/compiler/evaluators.js	1.89 kB
packages/db/dist/esm/query/compiler/expressions.js	430 B
packages/db/dist/esm/query/compiler/group-by.js	3.56 kB
packages/db/dist/esm/query/compiler/index.js	6.67 kB
packages/db/dist/esm/query/compiler/joins.js	2.5 kB
packages/db/dist/esm/query/compiler/lazy-targets.js	923 B
packages/db/dist/esm/query/compiler/order-by.js	1.74 kB
packages/db/dist/esm/query/compiler/select.js	1.53 kB
packages/db/dist/esm/query/effect.js	4.77 kB
packages/db/dist/esm/query/expression-helpers.js	1.43 kB
packages/db/dist/esm/query/ir.js	1.25 kB
packages/db/dist/esm/query/live-query-collection.js	360 B
packages/db/dist/esm/query/live/collection-config-builder.js	9.1 kB
packages/db/dist/esm/query/live/collection-registry.js	264 B
packages/db/dist/esm/query/live/collection-subscriber.js	1.93 kB
packages/db/dist/esm/query/live/internal.js	145 B
packages/db/dist/esm/query/live/utils.js	1.81 kB
packages/db/dist/esm/query/optimizer.js	2.92 kB
packages/db/dist/esm/query/predicate-utils.js	2.97 kB
packages/db/dist/esm/query/query-once.js	359 B
packages/db/dist/esm/query/subset-dedupe.js	960 B
packages/db/dist/esm/scheduler.js	1.3 kB
packages/db/dist/esm/SortedMap.js	1.3 kB
packages/db/dist/esm/strategies/debounceStrategy.js	247 B
packages/db/dist/esm/strategies/queueStrategy.js	428 B
packages/db/dist/esm/strategies/throttleStrategy.js	246 B
packages/db/dist/esm/transactions.js	3.04 kB
packages/db/dist/esm/utils.js	927 B
packages/db/dist/esm/utils/array-utils.js	273 B
packages/db/dist/esm/utils/browser-polyfills.js	304 B
packages/db/dist/esm/utils/btree.js	5.61 kB
packages/db/dist/esm/utils/comparison.js	1.15 kB
packages/db/dist/esm/utils/cursor.js	457 B
packages/db/dist/esm/utils/index-optimization.js	2.39 kB
packages/db/dist/esm/utils/type-guards.js	157 B
packages/db/dist/esm/utils/uuid.js	449 B
packages/db/dist/esm/virtual-props.js	360 B

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[github-actions]

Size Change: 0 B

Total Size: 4.22 kB

ℹ️ View Unchanged

Filename	Size
packages/react-db/dist/esm/index.js	249 B
packages/react-db/dist/esm/useLiveInfiniteQuery.js	1.32 kB
packages/react-db/dist/esm/useLiveQuery.js	1.33 kB
packages/react-db/dist/esm/useLiveQueryEffect.js	355 B
packages/react-db/dist/esm/useLiveSuspenseQuery.js	567 B
packages/react-db/dist/esm/usePacedMutations.js	401 B

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