Change document titles to sentence case

Why

Document titles currently use inconsistent capitalisation. Sentence case improves readability and provides a consistent, professional appearance across the platform.

What

Update all document titles throughout the system to use sentence case formatting (first letter capitalised, rest lowercase except for proper nouns).

How

• Review all document title displays in the UI
• Update title formatting to sentence case
• Ensure proper nouns and acronyms remain capitalised
• Apply consistently across all document types (POs, invoices, delivery notes, etc.)

Dependencies

None

Acceptance Criteria

• All document titles display in sentence case
• Proper nouns and acronyms retain correct capitalisation
• Formatting is consistent across all document types
• No regression in existing title functionality