[US-017] Store profile page for buyers

[leimo2011]

User Story

As a buyer,
I want to view a store's full profile,
So that I can learn about the store, see their products, and decide if I want to follow them.

Acceptance Criteria

• Store page shows: banner, logo, name, bio, category, region, follower count, rating
• Active live links displayed prominently
• Product catalog browsable
• Past live history (last 10)
• Social media links clickable
• Follow / Share buttons

Estimate: 5 SP | Milestone: M2

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Epic: [EPIC-07] Mobile App - Buyer Experience