feat(UniverSheet): add LoadingText parameter

[ArgoZhang]

Link issues

fixes #7496

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

Enhancements:

• Clean up the UniverSheets sample CSS by correcting the .bb-sheet-demo selector formatting.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Minor cleanup in the UniverSheets sample styles: normalize the CSS file header so the .bb-sheet-demo class selector is defined without a leading BOM character; no functional changes are visible in the provided diff.

File-Level Changes

Change	Details	Files
Normalize UniverSheets demo CSS so the root class selector is a plain .bb-sheet-demo without an invisible BOM character.	Remove the UTF-8 BOM/invisible character before the .bb-sheet-demo selector in the UniverSheets sample CSS file header to ensure clean class naming and avoid potential tooling issues	src/BootstrapBlazor.Server/Components/Samples/UniverSheets.razor.css

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#7496	Add a LoadingText parameter to the UniverSheet component (including any necessary wiring in code and/or markup so it can be used).	❌	The diff only shows a minor change to the UniverSheets.razor.css file (removal of a BOM) and an unchanged .csproj entry. There are no code, markup, or parameter additions related to a LoadingText parameter.
#7496	Update any relevant sample/demo or documentation to demonstrate or describe the new LoadingText parameter for UniverSheet.	❌	The PR does not modify any sample component markup, demo files, or documentation content; only a CSS file was touched, with no functional or documentation changes.

Possibly linked issues

• feat(UniverSheet): add LoadingText parameter #7496: The PR implements the UniverSheet LoadingText parameter as requested in the issue, resolving the feature request.

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[sourcery-ai]

Hey - I've left some high level feedback:

• The PR title and description suggest adding a LoadingText parameter, but the only change here is a minor CSS tweak; please either update the PR metadata or include the intended functional changes so the diff aligns with the description.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The PR title and description suggest adding a LoadingText parameter, but the only change here is a minor CSS tweak; please either update the PR metadata or include the intended functional changes so the diff aligns with the description.

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[Copilot]

Pull request overview

This PR updates the BootstrapBlazor.UniverSheet package to version 10.0.7, which includes the new LoadingText parameter feature mentioned in issue #7496. The changes also include a minor formatting fix to remove a BOM character from a CSS file.

Changes:

• Updated BootstrapBlazor.UniverSheet package reference from version 10.0.6 to 10.0.7
• Removed BOM (Byte Order Mark) character from UniverSheets.razor.css

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/BootstrapBlazor.Server/BootstrapBlazor.Server.csproj	Updated BootstrapBlazor.UniverSheet package version to 10.0.7 to include the new LoadingText parameter
src/BootstrapBlazor.Server/Components/Samples/UniverSheets.razor.css	Removed BOM character from the beginning of the CSS file

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