feat: add page navigator to bottom of the page

[aryansondharva]

Summary

This PR addresses issue #2162 by adding the page navigator at the bottom of the relevant page.

Changes

• Reused the existing page navigation / pagination component
• Added the navigator at the bottom of the page
• Kept the existing navigation logic unchanged
• Improved usability by allowing users to move between pages without scrolling back to the top

Related Issue

Closes#2162

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[Copilot]

Pull request overview

Note

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Adds Prev/Next page navigation controls to multiple PDF-related pages to improve document paging UX.

Changes:

• Import the shared PrevNext component into several pages.
• Render PrevNext under the PDF viewer area with consistent centering/padding.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
apps/OpenSign/src/pages/TemplatePlaceholder.jsx	Adds PrevNext import and renders pager under the PDF area.
apps/OpenSign/src/pages/SignyourselfPdf.jsx	Adds PrevNext import and renders pager under the PDF area.
apps/OpenSign/src/pages/PlaceHolderSign.jsx	Adds PrevNext import and renders pager under the PDF area.
apps/OpenSign/src/pages/PdfRequestFiles.jsx	Adds PrevNext import and renders pager under the PDF area.

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[aryansondharva]

Hi maintainers, this PR is ready for review. It adds the existing page navigator to the bottom of the PDF pages as requested in issue #2162. I'd appreciate a review when you have time. Thank you!