fix(db) loadSubset when orderby has multiple columns

[samwillis]

stacked on #958

Enhanced multi-column orderBy support with lazy loading and composite cursor optimization.

Changes:

• Create index on first orderBy column even for multi-column orderBy queries, enabling lazy loading with first-column ordering
• Pass multi-column orderBy to loadSubset with precise composite cursors (e.g., or(gt(col1, v1), and(eq(col1, v1), gt(col2, v2)))) for backend optimization
• Use wide bounds (first column only) for local index operations to ensure no rows are missed
• Use precise composite cursor for sync layer loadSubset to minimize data transfer

Benefits:

• Multi-column orderBy queries with limit now support lazy loading (previously disabled)
• Sync implementations (like Electric) can optimize queries using composite indexes on the backend
• Local collection uses first-column index efficiently while backend gets precise cursor

Prior to this change composite order by was broken as shown in the first commit CI run: https://github.com/TanStack/db/actions/runs/19741724803/job/56567001027

[changeset-bot]

🦋 Changeset detected

Latest commit: 9ecdc59

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

This PR includes changesets to release 13 packages

Name	Type
@tanstack/db	Patch
@tanstack/angular-db	Patch
@tanstack/db-collection-e2e	Patch
@tanstack/electric-db-collection	Patch
@tanstack/offline-transactions	Patch
@tanstack/powersync-db-collection	Patch
@tanstack/query-db-collection	Patch
@tanstack/react-db	Patch
@tanstack/rxdb-db-collection	Patch
@tanstack/solid-db	Patch
@tanstack/svelte-db	Patch
@tanstack/trailbase-db-collection	Patch
@tanstack/vue-db	Patch

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commit: 9ecdc59

[github-actions]

Size Change: +829 B (+0.95%)

Total Size: 88.2 kB

Filename	Size	Change
./packages/db/dist/esm/collection/subscription.js	2.71 kB	+166 B (+6.52%)	🔍
./packages/db/dist/esm/query/compiler/order-by.js	1.46 kB	+206 B (+16.48%)	⚠️
./packages/db/dist/esm/utils/cursor.js	457 B	+457 B (new file)	🆕

ℹ️ View Unchanged

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./packages/db/dist/esm/transactions.js	2.9 kB
./packages/db/dist/esm/utils.js	881 B
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./packages/db/dist/esm/utils/comparison.js	852 B
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./packages/db/dist/esm/utils/type-guards.js	157 B

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[github-actions]

Size Change: 0 B

Total Size: 3.35 kB

ℹ️ View Unchanged

Filename	Size
./packages/react-db/dist/esm/index.js	225 B
./packages/react-db/dist/esm/useLiveInfiniteQuery.js	1.17 kB
./packages/react-db/dist/esm/useLiveQuery.js	1.12 kB
./packages/react-db/dist/esm/useLiveSuspenseQuery.js	431 B
./packages/react-db/dist/esm/usePacedMutations.js	401 B

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[kevin-dp]

Great PR again! Addressing the problems in a concise and understandable way.