fix(app): show reasoning by default

[benjaminshafii]

Summary

• Turn model reasoning visibility on by default for new/local preferences.
• Render reasoning as normal prose instead of monospace text and strip leading Thinking/Reasoning labels.
• Add focused coverage for the default visibility and rendered reasoning presentation.

Evidence

Screenshots

No screenshot committed. Browser-plugin UI verification was not completed after the local opencode-browser install path invoked the wrong extension installer; verification used focused render coverage plus Daytona build checks instead.

Build verification

• Local: bun test apps/app/tests/reasoning-display.test.ts passed.
• Local: pnpm --filter @openwork/app typecheck passed.
• Local: pnpm --filter @openwork/app build passed.
• Daytona sandbox openwork-eval-reasoning-20260515-161659: bun test apps/app/tests/reasoning-display.test.ts && pnpm --filter @openwork/app typecheck && pnpm --filter @openwork/app build passed.

API verification

No API changes.

UI verification

• Focused SSR render test confirms reasoning is visible by default, does not include a leading Thinking: label, and does not use font-mono.
• Console errors: not checked in a live browser session.
• Failed network requests: not checked in a live browser session.

Test instructions

1. pnpm install
2. bun test apps/app/tests/reasoning-display.test.ts
3. pnpm --filter @openwork/app typecheck
4. pnpm --filter @openwork/app build
5. Open Settings -> Preferences and verify "Show model reasoning" defaults to on for fresh preferences.
6. Open a session with model reasoning and verify reasoning appears as prose without a leading "Thinking" heading.

[benjaminshafii]

Verification

Completed checks:

• Local bun test apps/app/tests/reasoning-display.test.ts passed.
• Local pnpm --filter @openwork/app typecheck passed.
• Local pnpm --filter @openwork/app build passed.
• Daytona sandbox openwork-eval-reasoning-20260515-161659 ran bun test apps/app/tests/reasoning-display.test.ts && pnpm --filter @openwork/app typecheck && pnpm --filter @openwork/app build; all passed.

Live browser-plugin UI verification was not completed because the local _repos/opencode-browser install path invoked its own extension installer, which was not the requested OpenWork UI test path.

[vercel]

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