Feature: Deep work mode with distraction blocking

[gloomcheng]

Problem

As a developer who struggles with focus, I know my most productive hours but still get distracted by Slack, email, etc.

Current State

Toki's `insights` command shows peak hours and context switch patterns, but it's passive observation only.

Proposed Solution

1. Deep work scheduler - Set protected time blocks based on peak hours analysis
2. Distraction detection - Track when focus apps (IDE) switch to distraction apps (Slack, Twitter)
3. Gentle notifications - "You've been on Slack for 15 mins during your deep work block"
4. Focus score - Daily/weekly metric for uninterrupted work time

Example

```bash
toki focus start --duration 2h

Tracks focus, notifies if context switch detected

toki focus report

Shows focus time vs interruptions

```

Related Pain Points

• Workflow disruption from time tracking
• Context switching kills productivity
• Need actionable insights, not just observation