feat(examples): add wa-sqlite OPFS persistence demo

[kevin-dp]

Summary

• Adds a new /wa-sqlite route to the offline-transactions example app demonstrating collection-level persistence using @tanstack/db-browser-wa-sqlite-persisted-collection
• Unlike the existing IndexedDB/localStorage pages (which use offline executor mutation queuing), this uses persistedCollectionOptions for local-first data storage in a real SQLite database in the browser via OPFS
• Includes Vite config for WASM serving middleware (TanStack Start's catch-all intercepts .wasm requests), source aliasing for ?worker imports, and a fix for the missing getRouter export

Test plan

• Run pnpm dev in examples/react/offline-transactions
• Visit http://localhost:3000/wa-sqlite
• Add todos, toggle completion, delete — verify all operations work
• Refresh the page — verify todos persist across reloads
• Verify existing IndexedDB and localStorage pages still work
• Replace the workspace dependencies by actual versioned deps for @tanstack/db and @tanstack/db-browser-wa-sqlite-persisted-collection

Note: the IndexedDB and localStorage examples in this demo are actually broken (were already broken before this PR). The API routes at /api/todos won't work in SPA mode because there's no server to handle them. The fetchWithRetry keeps retrying with exponential backoff, causing an infinite "Loading todos..." state.

🤖 Generated with Claude Code

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[pkg-pr-new]

More templates

• todos
• tanstack-start-example-basic
• @tanstack/db-example-paced-mutations-demo
• tanstack-start-db-projects-example
• @tanstack/db-example-react-todo
• offline-transactions-react-native
• @tanstack/db-example-solid-todo

@tanstack/angular-db

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@tanstack/db

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@tanstack/db-browser-wa-sqlite-persisted-collection

npm i https://pkg.pr.new/TanStack/db/@tanstack/db-browser-wa-sqlite-persisted-collection@1329

@tanstack/db-cloudflare-do-sqlite-persisted-collection

npm i https://pkg.pr.new/TanStack/db/@tanstack/db-cloudflare-do-sqlite-persisted-collection@1329

@tanstack/db-electron-sqlite-persisted-collection

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@tanstack/db-ivm

npm i https://pkg.pr.new/TanStack/db/@tanstack/db-ivm@1329

@tanstack/db-node-sqlite-persisted-collection

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@tanstack/db-react-native-sqlite-persisted-collection

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@tanstack/db-sqlite-persisted-collection-core

npm i https://pkg.pr.new/TanStack/db/@tanstack/db-sqlite-persisted-collection-core@1329

@tanstack/electric-db-collection

npm i https://pkg.pr.new/TanStack/db/@tanstack/electric-db-collection@1329

@tanstack/offline-transactions

npm i https://pkg.pr.new/TanStack/db/@tanstack/offline-transactions@1329

@tanstack/powersync-db-collection

npm i https://pkg.pr.new/TanStack/db/@tanstack/powersync-db-collection@1329

@tanstack/query-db-collection

npm i https://pkg.pr.new/TanStack/db/@tanstack/query-db-collection@1329

@tanstack/react-db

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@tanstack/rxdb-db-collection

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@tanstack/solid-db

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@tanstack/svelte-db

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@tanstack/trailbase-db-collection

npm i https://pkg.pr.new/TanStack/db/@tanstack/trailbase-db-collection@1329

@tanstack/vue-db

npm i https://pkg.pr.new/TanStack/db/@tanstack/vue-db@1329

commit: f815a2f

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Total Size: 94.6 kB

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Size Change: 0 B

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[tobacode]

The fetchWithRetry keeps retrying with exponential backoff, causing an infinite "Loading todos"

The infinite retry loop here might be related to #1065