feat(dashboard): add suspense boundaries for dashboard sections

[SnehaSnigdhaSahoo]

Description

Fixes #71
Improved the dashboard loading experience by adding Suspense boundaries for heavier sections so the main layout can render immediately while data-heavy components load separately.

Changes made

• Added Suspense boundaries for:
  ActivityLandscape
  AIInsights
• Created async wrapper components for streamed components.
• Added lightweight skeleton fallbacks matching the existing dashboard UI.
• Preserved existing dashboard functionality and layout structure.
• Added Suspense fallbacks to avoid blocking the dashboard shell render.

Screenshot

Pillar

• 🎨 Pillar 1 — New Theme Design
• 📐 Pillar 2 — Geometric SVG Improvement
• 🕐 Pillar 3 — Timezone Logic Optimization
• 🛠️ Other (Bug fix, refactoring, docs)

Visual Preview

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