fix: set mobile viewport initial scale

[saurabhhhcodes]

Summary

• update the exported Next.js viewport config to use initialScale: 1
• preserve the existing responsive viewport settings

Fixes #184

Root Cause

app/layout.tsx set initialScale: 0, which is outside the valid viewport initial-scale range and can cause incorrect mobile scaling.

Validation

• npm run lint passes with existing warnings only
• npm run build passes
• git diff --check passes

Impact

Mobile browsers now receive a valid 1:1 initial viewport scale.

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