fix(exp): experience bar overflows

[olisikh]

Fixes bar overflows when sometimes it shows numbers > 9, both for master and normal experience progression.
This PR is manually tested by myself, works pretty well so far.

[gemini-code-assist]

Summary of Changes

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This pull request addresses issues where experience bar values could overflow or display incorrectly by implementing strict bounds checking and safe arithmetic operations. It introduces centralized logic for calculating experience boundaries and clamping values, ensuring that both normal and master experience progression remain within valid ranges during updates and rendering.

Highlights

• Experience Clamping: Implemented robust clamping logic for experience values to prevent overflows beyond the defined level boundaries.
• Saturating Arithmetic: Added helper functions for saturating arithmetic to safely handle experience calculations without risking integer overflows.
• UI Rendering Fixes: Updated the experience bar rendering logic to use the new clamping and segment building functions, ensuring accurate visual representation.

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[gemini-code-assist]

Code Review

This pull request refactors experience rendering and calculation logic to improve robustness and prevent overflows. It introduces a buildExpSegment helper in NewUIMainFrameWindow.cpp and several saturating arithmetic and bounding helpers in WSclient.cpp. Feedback suggests using std::numeric_limits for better C++ style and simplifying the saturating multiplication logic.