fix: allow decimal weights; keep 0.x; trim integer leading zeros

[lmezasemet]

📝 Description

The weight input now accepts decimals and stores them internally as deci-units (×10) in valuesInt.
On blur, the value is normalized with normalizeDecimal(..., { maxDecimals: 1 }), which preserves 0.x, trims redundant zeros, and limits to one decimal place.
For reps and time, normalizeInteger is applied on blur to keep only digits, remove leading zeros, and drop any fraction.

📋 Checklist

• My code follows the project conventions
• This PR includes breaking changes
• I have updated documentation if necessary

🗃️ Prisma Migrations (if applicable)

• I have created a migration
• I have tested the migration locally

📸 Screenshots (if applicable)

🔗 Related Issues

Fixes: #97 , #99

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