Fix nested extension navigation

[pablopunk]

Summary

• preserve parent views when pushed child views open, including AI chats
• add explicit root navigation/action API for intentional stack resets
• add navigation reducer tests and a root-navigation fixture

Verification

• mise exec -- pnpm typecheck
• mise exec -- pnpm -C backend exec node --import tsx --test ../src/extension-view.test.tsx
• mise exec -- pnpm exec node scripts/check-clone-safe-actions.cjs
• mise exec -- pnpm exec node scripts/check-internal-extensions.cjs

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Project	Deployment	Actions	Updated (UTC)
nvm	Building	Preview, Comment	Jun 6, 2026 12:33am

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 8e63a756-6747-4aac-a2dd-c79b1503c7ec

📥 Commits

Reviewing files that changed from the base of the PR and between d465c05 and b71e365.

📒 Files selected for processing (8)

• src/App.tsx
• src/electron/main.ts
• src/extension-view.test.tsx
• src/fixtures/ui-fixtures.ts
• src/model.ts
• src/preload-api.ts
• src/resources/nevermind-extension-api.d.ts
• src/use-extension-navigation.ts

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