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Implement a stateful class that tracks the current page and total pages.
Dynamically calculate a centered window of visible page numbers based on size constraints.
Render a formatted UI string with arrows and markers after each navigation action.
What This Tests
State management and pointer tracking
Fixed-size window calculation over a bounded range
Edge case handling for boundary clamping and even-length offsets
String construction and formatting logic
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Sliding Window
Simulation
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