fix(Select): search icon not vertical center when use BI icon theme

[ArgoZhang]

Link issues

fixes #6171

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

Fix search icon vertical alignment issues in the Select component under the BI icon theme and update the PdfViewers sample default to disable Google Docs

Bug Fixes:

• Center the search icon in the Select component when using the BI icon theme by adding flex-based centering and adjusting its vertical offset
• Adjust the global SCSS theme variable for the select search icon top offset

Chores:

• Change default Google Docs usage to false in PdfViewers sample

[sourcery-ai]

Reviewer's Guide

This PR adjusts the Select component’s search icon styling to center the BI icon, tweaks the SCSS variable for vertical alignment in the theme, and changes the default PdfViewer sample to disable Google Docs rendering.

File-Level Changes

Change	Details	Files
Centered the search icon in the Select component by enforcing a flex layout	Added fixed width and height to the icon Applied display: flex with align-items and justify-content centered	src/BootstrapBlazor/Components/Select/Select.razor.scss
Adjusted the top offset for the search icon placeholder in the theme variables	Reduced $bb-select-search-icon-top from 19px to 18px	src/BootstrapBlazor/wwwroot/scss/theme/bootstrapblazor.scss
Changed the PdfViewer sample default to not use Google Docs	Set _useGoogleDocs default value to false	src/BootstrapBlazor.Server/Components/Samples/PdfViewers.razor.cs

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#6171	The search icon in the Select component should be vertically centered when using the BI icon theme.	✅

Possibly linked issues

• bug(Select): search icon not vertical center when use BI icon theme #6171: The PR fixes the search icon vertical centering issue by adjusting CSS positioning and adding centering properties.

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[sourcery-ai]

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

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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