feat(Fluent): add Fluent UI theme

[ArgoZhang]

Link issues

fixes #1103

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

Add a Fluent UI theme package that brings Fluent design tokens and component styling to BootstrapBlazor in both light and dark modes.

New Features:

• Add a Fluent UI theme package with light and dark theme support for BootstrapBlazor.

Bug Fixes:

• Align component states, validation feedback, disabled controls, and dark-mode surfaces with Fluent UI color and contrast guidance.

Enhancements:

• Apply Fluent UI design tokens across Bootstrap and BootstrapBlazor components, including typography, spacing, borders, shadows, controls, navigation, overlays, tables, forms, and feedback elements.

Build:

• Add the new BootstrapBlazor.Theme.Fluent project to the solution and package its themed stylesheets.

[sourcery-ai]

Reviewer's Guide

Adds a new BootstrapBlazor Fluent UI theme package and CSS bundle that maps Fluent 2 design tokens into Bootstrap/BootstrapBlazor variables, providing consistent light/dark theming and component-specific overrides without changing existing component markup.

File-Level Changes

Change	Details	Files
Introduce a new Fluent UI theme component package and wire it into the solution.	Create BootstrapBlazor.Theme.Fluent.csproj under src/components to host the Fluent theme assets. Register the new project in BootstrapBlazor.Extensions.slnx so it builds with the extensions solution.	BootstrapBlazor.Extensions.slnx src/components/BootstrapBlazor.Theme.Fluent/BootstrapBlazor.Theme.Fluent.csproj
Add a Fluent 2-based CSS theme that redefines Bootstrap and BootstrapBlazor variables for light/dark modes and aligns component styling with Fluent UI design tokens.	Define root light and dark theme color, typography, spacing, border radius, and shadow tokens based on Fluent webLightTheme/webDarkTheme, mapped into --bs-* and --bb-* variables. Override BootstrapBlazor component-scoped variables (layout, menu, tabs, calendar, picker, table, upload, tree, etc.) to replace hard-coded legacy blues/greys with Fluent brand and neutral palettes, including separate dark-mode adjustments. Customize Bootstrap core components (buttons, forms, inputs, dropdowns, tooltips, alerts, modals, toasts, progress, list groups, pagination, nav pills, etc.) to follow Fluent interaction states (hover/pressed, focus ring, disabled behavior) and sizing (control heights, font sizes). Adjust specialized widgets (switch, slider, rate, timeline, avatar, card, skeleton, mask, light indicators, SweetAlert, DateTimePicker/Range, transfer, segmented, dial-button, etc.) to use Fluent status, overlay, and motion tokens while keeping existing structure and utilities. Provide a minified version fluent.min.css that matches the unminified fluent.css for production use.	src/components/BootstrapBlazor.Theme.Fluent/wwwroot/fluent.css src/components/BootstrapBlazor.Theme.Fluent/wwwroot/fluent.min.css

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#1103	Add a Fluent UI theme to BootstrapBlazor.	✅
#1103	Provide Fluent-themed styling for both light and dark color modes, including Bootstrap and BootstrapBlazor component variables and visual states.	✅
#1103	Package the Fluent theme as a consumable BootstrapBlazor theme component with stylesheet assets included in the solution.	✅

Possibly linked issues

• feat(Fluent): add Fluent UI theme #1103: The PR directly implements the issue by adding Fluent theme project, CSS variables, and comprehensive component styling.

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[bb-auto]

Auto approved by bb-auto

[sourcery-ai]

Hey - I've found 1 issue

Prompt for AI Agents

Please address the comments from this code review:

## Individual Comments

### Comment 1
<location path="src/components/BootstrapBlazor.Theme.Fluent/wwwroot/fluent.css" line_range="1924" />
<code_context>
+}
+
+/* ===== Alert / Message — Fluent InfoBar: no visible border ===== */
+.alert {
+    --bs-alert-border: 0; /* InfoBar: border replaced by status background tint */
+    --bs-alert-padding-x: 12px; /* MessageBar paddingLeft (spacingHorizontalM) */
+    --bs-alert-padding-y: 8px; /* 8px + 20px line + 8px = 36px (MessageBar minHeight) */
+}
</code_context>
<issue_to_address>
**issue (bug_risk):** `.alert` continues rendering its default border because Bootstrap consumes `--bs-alert-border-width`, not `--bs-alert-border`; setting the unused variable does not implement the documented borderless Fluent InfoBar styling.

**Triggers:** When an alert is rendered with the default Bootstrap alert border.

**Suggested fix:** Set `--bs-alert-border-width: 0` (and retain the border color override if needed).

```suggestion
    --bs-alert-border-width: 0; /* InfoBar: border replaced by status background tint */
```
</issue_to_address>

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[bb-auto]

Auto approved by bb-auto

[bb-auto]

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