feat(PdfViewer): add PageIndex parameter

[ArgoZhang]

Link issues

fixes #6514

Summary By Copilot

Regression?

• Yes
• No

Risk

• High
• Medium
• Low

Verification

• Manual (required)
• Automated

Packaging changes reviewed?

• Yes
• No
• N/A

☑️ Self Check before Merge

⚠️ Please check all items below before review. ⚠️

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• Merge the latest code from the main branch

Summary by Sourcery

Introduce a PageIndex parameter to the PdfViewer component and update its sample to allow selecting the initial page.

New Features:

• Add a PageIndex parameter to the PdfViewer component sample.
• Include a dropdown control in the sample to bind and change the starting page of the PDF.
• Initialize and bind a private _pageIndex field so the viewer starts on the selected page.

[sourcery-ai]

Reviewer's Guide

This PR adds a PageIndex parameter to the PdfViewer sample by introducing a select input for page selection, binding it to a new backing field, and passing it to the PdfViewer component, with corresponding project file updates.

Class diagram for updated PdfViewers sample component

classDiagram
    class PdfViewers {
        - bool _useGoogleDocs
        - int _pageIndex
        + Task OnLoaded()
        + Task NotSupportCallback()
    }

Loading

File-Level Changes

Change	Details	Files
Introduce PageIndex support in PdfViewer sample	Add a Select input for PageIndex with predefined options Bind the Select’s value to a new _pageIndex field Pass PageIndex="@_pageIndex" to the PdfViewer component	src/BootstrapBlazor.Server/Components/Samples/PdfViewers.razor src/BootstrapBlazor.Server/Components/Samples/PdfViewers.razor.cs
Update project configuration	Apply project file modifications to incorporate new sample changes	src/BootstrapBlazor.Server/BootstrapBlazor.Server.csproj src/BootstrapBlazor/BootstrapBlazor.csproj

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#6514	Add a PageIndex parameter to the PdfViewer component.	✅

Possibly linked issues

• feat(PdfViewer): add PageIndex parameter #6514: The PR adds the PageIndex parameter to PdfViewer as requested by the issue.

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[sourcery-ai]

Hey @ArgoZhang - I've reviewed your changes and they look great!

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (ccfb30f) to head (c4937bc).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #6515   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          714       714           
  Lines        31387     31387           
  Branches      4430      4430           
=========================================
  Hits         31387     31387           

Flag	Coverage Δ
BB	100.00% <ø> (?)

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