Remove guided onboarding flow

[Copilot]

First-time visitors were presented with a guided onboarding overlay with step-by-step instructions. This flow has been removed to simplify the initial user experience.

Changes

UI Layer

• Removed OnboardingGuide component from AuthenticatedLayout
• Removed "Re-do onboarding" action from all command palettes (Day, Now, Week)

State Management

• Deleted /packages/web/src/views/Onboarding/ (components, hooks, constants, types, utils)
• Deleted /packages/web/src/auth/hooks/onboarding/ (useSkipOnboarding, useIsSignupComplete)
• Removed ONBOARDING_PROGRESS from storage constants

Backend Integration

• Removed fetchOnboardingStatus() from Google auth flow
• Removed loadOnboardingStatus() router loader
• Removed onboarding status tracking in useGoogleAuth

Tests

• Removed onboarding-related test cases and mocks from command palette tests
• Removed fetchOnboardingStatus test suite

Impact

~2,500 lines removed across 32 files. No user-facing functionality is lost—the onboarding flow was optional and could be skipped.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Remove guided intro component and flow</issue_title>
<issue_description>### Priority

None

Feature Description

Currently when a user visits compass for the first time, they see a guided onboarding flow on the home page, which uses an overlay component at the bottom of the page.
We should remove that component in order to make the app more simple for visitors.

Remove this component and all of the onboarding logic and state that is involved in maintaining it.

This inclues:

• ONBOARDING_STEPS
• ONBOARDING_STEP_CONFIGS
• ONBOARDING_GUIDE_VIEWS
• ONBOARDING_RESTART_EVENT
• The command palette action to restart onboarding

Use Case

This'll simplify onboarding for new users and make the codebase easier to maintain

Additional Context

No response</issue_description>

<agent_instructions>Remove all related code that is unused or unnecessary or outdated or dead</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Remove guided intro component and flow #1454

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closes #1308

[tyler-dane]

closing in favor of #1455