Remove stale onboarding code after flow simplification

[Copilot]

The onboarding was recently simplified from a multi-step interactive flow to a command palette guide overlay. This left ~81 files of unused code (steps, layouts, sandboxes, tutorials).

Changes

Removed (79 files, 12K LOC)

• steps/ directory - welcome screens, sign-in flow, task/event sandboxes, reminder setup, outro screens
• Component layer - Onboarding.tsx container, OnboardingStep, footers, forms, overlays, layouts, styled-components
• Hook layer - useOnboardingShortcuts, useOnboardingOverlay, useStoredTasks, useAuthPrompt
• Types - onboarding-notice.types.ts and barrel files

Modified

• useGoogleAuth.ts - removed unused OnboardingStepProps parameter

Retained (15 files)

• OnboardingGuide component and supporting UI components
• Step detection, state management, and progress tracking hooks
• Storage utilities and step configuration constants

Example

Before (unused):

export function useGoogleAuth(props?: OnboardingStepProps) {
  // ...
  props?.onNext?.(); // Called old multi-step flow
}

After:

export function useGoogleAuth() {
  // Simplified - no step props needed for guide overlay
}

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Remove stale onboarding code</issue_title>
<issue_description>We recently simplified onboarding, meaning there are now a lot of unused component code in src/views/Onboarding and elsewhere. Remove all the dead code related to onboarding</issue_description>

<agent_instructions>Be liberal in removing code if it doesn't have a use</agent_instructions>

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

• Fixes Remove stale onboarding code #1414

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[Copilot]

Pull request overview

This PR removes approximately 81 files (~12K LOC) of unused onboarding code following the simplification of the onboarding flow from an interactive multi-step process to a command palette guide overlay.

Changes:

• Removes 79 unused files including steps, layouts, sandboxes, tutorials, hooks, types, and tests
• Modifies useGoogleAuth.ts to remove the unused OnboardingStepProps parameter
• Retains 15 files that support the new guide overlay system

Reviewed changes

Copilot reviewed 80 out of 80 changed files in this pull request and generated no comments.

File	Description
useGoogleAuth.ts	Removes unused OnboardingStepProps parameter and onNext callback, simplifying the function signature
All other files	Deletion of unused onboarding components, hooks, types, tests, and utilities from the old multi-step flow