chore(CssBundler): add css-bundler tools

[ArgoZhang]

Link issues

fixes #6840

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

Configure CSS bundler tooling and remove legacy CSS bundles, and refine sample components with explicit markup and localized display texts

New Features:

• Introduce CSS bundling support via new dotnet-tools.json and bundler.json configuration

Enhancements:

• Update ColorPicker samples to use explicit opening and closing tags
• Localize Switch DisplayText in sample components

Build:

• Add CSS bundler tooling configuration to the repository

Chores:

• Remove pre-generated CSS bundle files from wwwroot
• Update .gitignore to account for CSS bundler outputs

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR integrates a CSS bundler into the build pipeline and updates the component sample markup and localization resources.

Class diagram for updated ColorPickers sample markup

classDiagram
    class ColorPicker {
        +Value
        +IsDisabled
        +IsSupportOpacity
    }
    class DemoBlock {
        +Title
        +Introduction
        +Name
    }
    class Switch {
        +Value
        +DisplayText
        +ShowLabel
    }
    class ValidateForm {
        +Model
    }
    DemoBlock "1" *-- "1" ColorPicker : contains
    DemoBlock "1" *-- "1" Switch : contains
    ValidateForm "1" *-- "1" ColorPicker : contains

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File-Level Changes

Change	Details	Files
Integrate CSS bundler tooling into the project	Added dotnet-tools.json to pin the css-bundler CLI Introduced bundler.json configuration for bundle inputs and outputs Updated csproj and Directory.Build.targets to invoke css-bundler during build Removed pre-generated bundle CSS files from wwwroot	dotnet-tools.json src/BootstrapBlazor/bundler.json src/BootstrapBlazor/BootstrapBlazor.csproj src/BootstrapBlazor/Directory.Build.targets src/BootstrapBlazor/wwwroot/css/bootstrap.blazor.bundle.min.css src/BootstrapBlazor/wwwroot/css/bootstrap.blazor.bundle.rtl.min.css
Refactor sample component markup in ColorPickers.razor	Converted self-closing ColorPicker tags to explicit opening/closing form Ensured @bind-Value usages are closed consistently Updated markup indentation for readability	src/BootstrapBlazor.Server/Components/Samples/ColorPickers.razor
Enhance localization for Switch control labels	Replaced hardcoded DisplayText on Switch with Localizer references Added SupportOpacity and Disabled keys to locale JSONs	src/BootstrapBlazor.Server/Locales/en-US.json src/BootstrapBlazor.Server/Locales/zh-CN.json

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#6840	Add css-bundler tools to the repository (including configuration and/or tool files).	✅
#6840	Remove previously bundled CSS files that are now handled by the css-bundler tools.	✅

Possibly linked issues

• chore(CssBundler): add css-bundler tools #6840: The PR adds new bundler configuration files and removes old CSS bundles, aligning with adding css-bundler tools.
• chore(CssBundler): add css-bundler tools #6840: The PR updates the CSS bundler by adding css-bundler tools as requested in the issue.
• chore(CssBundler): add css-bundler tools #6840: The PR adds CSS bundler tools and modifies CSS bundling, which directly addresses the issue's request for version/cache-busting support for component-specific assets.

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[Copilot]

Pull Request Overview

This PR introduces CSS bundling functionality by replacing CSS @import statements with a build-time bundling tool. The changes implement a css-bundler tool to concatenate CSS files during the build process instead of relying on browser @import directives.

• Adds css-bundler tooling configuration and build targets to automatically bundle CSS files
• Updates localization files with new strings for ColorPicker component
• Makes minor code style improvements to ColorPicker component markup

Reviewed Changes

Copilot reviewed 9 out of 10 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
dotnet-tools.json	Adds bootstrapblazor.cssbundler tool configuration
src/BootstrapBlazor/bundler.json	Configures CSS bundling inputs and outputs
src/BootstrapBlazor/Directory.Build.targets	Adds CssBundler MSBuild target to execute bundling
src/BootstrapBlazor/BootstrapBlazor.csproj	Updates version and refines content inclusion patterns
src/BootstrapBlazor/wwwroot/css/bootstrap.blazor.bundle*.css	Removes @import statements to be replaced by bundled content
src/BootstrapBlazor.Server/Locales/*.json	Adds localization for ColorPicker component
src/BootstrapBlazor.Server/Components/Samples/ColorPickers.razor	Updates component markup and localization usage

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[sourcery-ai]

Hey there - 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 (04bec17) to head (43cb668).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #6841   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          739       739           
  Lines        31755     31755           
  Branches      4466      4466           
=========================================
  Hits         31755     31755           

Flag	Coverage Δ
BB	100.00% <ø> (?)

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