Refresh Remix alpha 6 agent docs

[kentcdodds]

Summary

• Upgraded the app to remix@3.0.0-beta.0 and migrated code off deprecated/removed APIs.
• Updated the client UI runtime from remix/component and legacy host css/on props to remix/ui and css()/on() mixins.
• Migrated fetch-router route objects from action to handler, data-table definitions to table()/column, and the D1 adapter to the current adapter contract.
• Fixed chat thread delete confirmation under the new UI event/style model.
• Deleted docs/agents/remix and replaced it with the Remix CLI packaged skill under .agents/skills/remix.

Testing

• bun run build
• bun run typecheck
• bun run lint
• bun run test:unit
• PLAYWRIGHT_PORT=8787 bun run test:e2e
• bun run test:mcp
• Targeted Prettier checks for touched source/docs files
• Remix skill replacement check: old docs removed, 12 packaged skill docs installed, no stale docs/agents/remix references
• Manual UI smoke test: home counter, signup/login, chat send, and delete confirmation

Notes

• bunx remix skills install is not available in remix@3.0.0-beta.0 (RMX_UNKNOWN_COMMAND); the beta CLI package contains the scaffolded Remix skill at @remix-run/cli/bootstrap/.agents/skills/remix, which is what this PR installs.
• The default Playwright port 8788 can collide with the local Resend mock worker when another dev server is already running; the passing full E2E run used PLAYWRIGHT_PORT=8787 to target the app worker.
• A broad bun run format:check still reports unrelated pre-existing formatting issues outside this migration; touched source/docs files were checked with targeted Prettier commands.

  

[github-actions]

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Mocks:

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[cursor]

Cursor Bugbot has reviewed your changes and found 2 potential issues.

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^{Reviewed by Cursor Bugbot for commit af4a435. Configure here.}

[cursor]

Missing pointerEvents:'none' on invisible delete button

Medium Severity

The delete button's CSS has opacity: 0 but is missing pointerEvents: 'none', which was present in the old code. The parent container's hover rule sets pointerEvents: 'auto' (line 1049) to re-enable clicks on hover — but without the base pointerEvents: 'none' on the button itself, the invisible button is always clickable. Users can accidentally trigger the delete confirmation (or deletion) by clicking the area where the hidden button sits.

Additional Locations (1)

• client/routes/chat.tsx#L1042-L1052

 

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[cursor]

Unused exported createDoubleCheck function after refactor

Low Severity

createDoubleCheck is exported from double-check.ts but has zero consumers in the codebase. Its only caller in chat.tsx was removed in this PR, replaced by the inline confirmingDeleteThreadIds Set. The entire file (including its imports of on, ElementProps, Handle, MixinDescriptor, and the helper functions callAll and normalizeMix) is now dead code.

 

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