feat(gastown): simplify town overview header cards

[IamCoder18]

Summary

Updated apps/web/src/app/(app)/gastown/TownListPageClient.tsx to clean up the top stat card row on the Gas Town overview. Removed the Mode, Core, and Promise cards, which provided misleading or non-actionable information. Kept only the Towns count, moved the New Town button to sit alongside it on the right, and improved the loading state for the count.

Closes #3678

Verification

• Visually verified /gastown in the dev build and confirmed the header reads correctly with the single Towns card and aligned CTA.

Visual Changes

Before

After

Reviewer Notes

No functional or backend changes. This is a UI-only cleanup. The removed cards had no connected state or behavior.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Executive Summary

UI-only cleanup removing three static/misleading stat cards (Mode, Core, Promise) from both personal and org gastown overview headers; no logic, security, or performance issues in the changed code.

Files Reviewed (2 files)

• apps/web/src/app/(app)/gastown/TownListPageClient.tsx
• apps/web/src/app/(app)/organizations/[id]/gastown/OrgTownListPageClient.tsx

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[eshurakov]

Mirrored into #3794 from a trusted repository branch so Vercel can build it. The replacement PR preserves the commit authorship from this PR head and points back here for original community attribution/review context.