fix: Type generateDisputeHtml params and remove any on line items #560

[nijuse]

Closes #560

What changed

• Removed any: Introduced and applied the BillAuditResult type to dispute handlers and helper functions.
• Early validation: Parse audit results once when building auditCalls via BillAuditResultSchema.parse(), instead of at PDF download time.
• Cleaner rendering: Use auditResult instead of t.result and remove unnecessary null checks.

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