#848 [DOC-47] Add error handling patterns and best practices FIXED

[solidsole]

• Linked Issue: DOC-43 / [DOC-43] Add mapping table of contract errors to user-facing messages #761
• Title: Conventional Commits (docs: ...)
• What Changed: 3 missing codes added + wrong interaction table corrected + consolidated ERROR_HANDLING.md created + try-catch improved
• Validation: Issue referenced checked; contract/build marked N/A (source untouched); frontend/build marked N/A (catalog-only edit); screenshots/preview N/A
• Additional Notes: Drift-guard pass noted, code-50 multi-condition design trade-off explained, follow-up instructions included

CLOSE #848

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[solidsole]

@anumukul PLEASE REVIEW