Fix: Next button now increments page by 1 instead of jumping to last page

[Yamuna-b]

This pull request fixes issue #157.

• The Next button now correctly increments the page number by 1 instead of jumping to the last page.
• The Previous button decrements the page number by 1.
• Both buttons are disabled at their respective boundaries.

Tested and confirmed working as expected.
Fixes #157

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[Tanvichovatiya]

Great work !