feat(property-detail): improve empty state for property detail

[lovesmilesmall-hue]

Summary

Improves the empty state for the PropertyDetail view. When a listing has no description, the "About this Property" card now renders a proper empty state with a title, explanatory copy and icon instead of a blank paragraph that looked like broken markup.

Problem

PropertyDetailServer always rendered {property.description} inside a plain paragraph. Listings whose description was missing, empty or whitespace-only produced an empty paragraph with reserved spacing, which read as a rendering bug rather than an intentional absence of content, and gave the user no indication of where to look for information.

Changes Made

• Imported EmptyState from src/components/ui/EmptyState.tsx.
• Guarded the description paragraph in the "About this Property" card of src/components/PropertyDetailServer.tsx so it only renders when property.description contains non-whitespace content.
• Rendered an EmptyState with the data variant, a "No description available" title and guidance pointing the user to the investment details and calculator sections otherwise.

Implementation Details

The check uses property.description?.trim() so values that are undefined,
ull, an empty string or only whitespace all fall through to the empty state, while genuine descriptions render unchanged. The EmptyState component is a client component receiving only string props, so the parent remains a server component and the markup stays statically renderable.

Closes #1198

Closes #1197

Closes #1196

Closes #1195

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[nanaf6203-bit]

LGTM