Fix level emission, negative number handling, and member validation issues

[Copilot]

• Fix addLevel.js to pass user.level to notifyLevelUp instead of input level
• Remove redundant number coercion in setLevel.js
• Handle negative numbers in shortener.js to prevent NaN
• Fix indentation in levelUpNotifier.js (spaces to tabs)
• Add member existence check in rank.js before using member properties
• Revert connect.js to only notify when user explicitly sets notify: true

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[codacy-production]

Codacy's Analysis Summary

5 new issues (≤ 0 medium issue)
1 new security issue (≤ 0 issue)
0 complexity
2 duplications

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[Abadima]

@copilot I want connect.js to NOT notify unless user says true, please undo that specific change.

[Copilot]

@copilot I want connect.js to NOT notify unless user says true, please undo that specific change.

Reverted in commit c6d1dc7. The connect.js now only logs when notify: true is explicitly set, while keeping the options = {} default instead of options = [].