[US-037] Mobile store owner dashboard with key metrics

[leimo2011]

User Story

As a store owner on mobile,
I want a quick snapshot of my store performance on the mobile app home screen,
So that I can monitor my business without opening a laptop.

Acceptance Criteria

• Dashboard widget shows: today's views, active live links count, follower count, recent notifications
• Quick action buttons: Add Live Link, View Products, View Analytics
• Refresh on pull-to-refresh
• Greeting message with store name
• Upgrade CTA if on Free plan

Estimate: 3 SP | Milestone: M2

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Epic: [EPIC-15] Mobile App - Store Owner Experience