feat(app): default updateAutoDownload to true for new and unconfigured users

[yashranaway]

Refs #1095

Summary

• Flip the React Settings auto-download default from false to true so a fresh install opts in to downloading updates as soon as auto-check finds them.
• Use the same flip to migrate existing users who never opened the Updates toggle: readStoredBoolean(KEY, true) returns true only when no value has ever been written, so anyone who explicitly toggled the switch off keeps their stored "0" and stays opted out.
• Auto-check (already true by default) and the manual check / install flows remain unchanged.

Verification

• pnpm --filter @openwork/app typecheck currently fails on pre-existing origin/dev errors in settings-route.tsx lines 1324-1557 (automations and messaging tabs in flight) and messaging-view-state.ts; this branch only touches line 367.
• git diff --check clean.

Notes

• Out of scope: the pill-like updates presentation, the visible upgrade banner, and the backend-gated required-update path described on the issue. They depend on design and backend coordination and are better landed separately.
• Existing users who installed the app, never visited Settings > Updates, and stayed on default false will move to true on first run after this lands; this matches the issue's "existing users where safe" wording since auto-check was already on for them and only the download step changes.

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Project	Deployment	Actions	Updated (UTC)
openwork-landing	Ready	Preview, Comment, Open in v0	May 5, 2026 7:31pm

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