docs: add JSDoc documentation to utility functions across common utils

[Dark-Brain07]

What type of PR is this? (check all applicable)

• Refactor
• Feature
• Bug Fix
• Optimization
• Documentation Update

Description

Added comprehensive JSDoc documentation with @param, @returns, and @example tags to several undocumented utility functions in the src/common/utils/ directory. These functions are used throughout the explorer codebase but were missing inline documentation, making it harder for new contributors to understand their purpose and usage.

Files changed:

• number-utils.ts — Added JSDoc to isUint128, isStringNumber, and bigintPow with examples and context about their use in the Stacks ecosystem (e.g., uint128 for token amounts).

• string-utils.ts — Added JSDoc to splitStxAddressIntoParts which was the only undocumented function in the file. Documented its grouping behavior and edge case handling for trailing characters.

• validateUrl.ts — Added JSDoc to validateUrl explaining that it uses the URL constructor for validation, with usage examples.

• date-utils.ts — Added JSDoc to formatDateShort documenting the en-GB locale format and expected output like "14 Feb".

Issue ticket number and link

N/A — proactive documentation improvement.

Checklist:

• I have performed a self-review of my code.
• I have tested the change on desktop and mobile.
• I have added thorough tests where applicable.
• I've added analytics and error logging where applicable.

Screenshots (if appropriate):

N/A — documentation-only changes, no visual impact.

[vercel]

@Dark-Brain07 is attempting to deploy a commit to the Stacks Labs Team on Vercel.

A member of the Team first needs to authorize it.