Add theme tokens for the unreduced motion durations (#13557)

[msynk]

closes #13557

Summary by CodeRabbit

• New Features
  • Theme motion settings now preserve their source values while supporting reduced-motion preferences across standard and motion-overlay themes.
  • Added CSS variables for full motion durations and spinner settings.
• Bug Fixes
  • Accordion and modal animations now use theme-defined duration values consistently.
• Documentation
  • Clarified how motion themes, overlays, reduced motion, and forced animation interact.

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Walkthrough

Theme motion values now map to unreduced CSS tokens. Fluent styles apply effective motion aliases to motion overlays and apply reduced-motion values to those overlays. Accordion and modal styles use the full-duration Sass token.

Changes

Motion Theme Token and Reduced-Motion Flow

Layer / File(s)	Summary
Full-token theme mapping src/BlazorUI/Bit.BlazorUI/Styles/theme-variables.scss, src/BlazorUI/Bit.BlazorUI/Utils/BitCss.var.cs, src/BlazorUI/Bit.BlazorUI/Utils/Theme/BitTheme*.cs, src/BlazorUI/Bit.BlazorUI/Utils/Theme/BitTheme.ts, src/BlazorUI/Tests/Bit.BlazorUI.Tests/Utils/Theme/*, src/BlazorUI/CLAUDE.md	Theme motion values map to full CSS tokens. The motion alias group and tests cover the token mapping and overlay group detection.
CSS aliases and reduced-motion overlays src/BlazorUI/Bit.BlazorUI/Styles/Fluent/motion.fluent.scss, src/BlazorUI/Bit.BlazorUI/Styles/general.scss, src/BlazorUI/Bit.BlazorUI/Styles/theme-overlay.scss, src/BlazorUI/Bit.BlazorUI/Components/Surfaces/{Accordion/BitAccordion.scss,Modal/BitModal.scss}, src/BlazorUI/Demo/Client/Bit.BlazorUI.Demo.Client.Core/Pages/Theming/ThemingPage.razor, src/BlazorUI/Tests/Bit.BlazorUI.Tests/{Components/Surfaces/Modal/BitModalStylesheetTests.cs,Utils/Theme/BitMotionTokenTests.cs}	Fluent styles apply normal and reduced-motion aliases to motion overlays. Accordion and modal styles use the full-duration Sass token. Tests check the token aliases, overlay selectors, and modal duration expectation. The theming documentation describes the motion alias group and full-token values.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~25 minutes

Change: Feature

Merge Risk: 🔵 Low · up to 1db73

A themed component inside a ForceAnimation subtree can still use reduced motion durations. This is a narrow case, but it should be fixed before merge if that nesting is supported.

Pre-merge checks | 4 | 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 14 functions across 8 files. (8 skipped: 8…	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly identifies the primary change: adding theme tokens for unreduced motion durations. It is concise and directly related to the pull request objectives.
Linked Issues check		Issue #13557 has coding requirements. The PR adds the three $mot-duration-*-full theme aliases, maps BitTheme.Motion values to emitted -full CSS variables, and updates the motion alias rules. Bi…
Out of Scope Changes check		The changes stay within issue #13557. The motion overlay aliases, reduced-motion selector update, mapper changes, documentation, and tests support themeable unreduced motion values and their reduced-m…

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Full details: Docstring Coverage

Explanation

Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 14 functions across 8 files. (8 skipped: 8 unsupported.)

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• Resolve merge conflict in branch msynk/13557-blazorui-missing-motion-duration-theme-tokens

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_{I’m a rabbit, hopping past the tokens in the night
Full-duration leaves now keep their names in sight
Motion overlays wear aliases, neatly in a row
Reduced-motion winds can calm the styles below
I nibble Sass and bound away—one gentle, tested flow!}

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Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

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Inline comments:
Review comments at @src/BlazorUI/Bit.BlazorUI/Styles/general.scss:
- Line 48: Add a descendant-overlay selector alongside the existing `:root
.bit-fam[bit-theme-overlay~="motion"]` rule so motion-themed overlays anywhere
inside a `.bit-fam` subtree receive the full themed duration, including overlays
that do not themselves have `.bit-fam`.

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ℹ️ Review info

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• Configuration used: Repository UI
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• Run ID: 6ee99175-58bc-4ed9-a90f-ad6899e39856

📥 Commits

Reviewing files that changed from the base of the PR and between d64997c and 1db73eb.

📒 Files selected for processing (16)

• src/BlazorUI/Bit.BlazorUI/Components/Surfaces/Accordion/BitAccordion.scss
• src/BlazorUI/Bit.BlazorUI/Components/Surfaces/Modal/BitModal.scss
• src/BlazorUI/Bit.BlazorUI/Styles/Fluent/motion.fluent.scss
• src/BlazorUI/Bit.BlazorUI/Styles/general.scss
• src/BlazorUI/Bit.BlazorUI/Styles/theme-overlay.scss
• src/BlazorUI/Bit.BlazorUI/Styles/theme-variables.scss
• src/BlazorUI/Bit.BlazorUI/Utils/BitCss.var.cs
• src/BlazorUI/Bit.BlazorUI/Utils/Theme/BitTheme.ts
• src/BlazorUI/Bit.BlazorUI/Utils/Theme/BitTheme/BitThemeMotion.cs
• src/BlazorUI/Bit.BlazorUI/Utils/Theme/BitThemeMapper.cs
• src/BlazorUI/CLAUDE.md
• src/BlazorUI/Demo/Client/Bit.BlazorUI.Demo.Client.Core/Pages/Theming/ThemingPage.razor
• src/BlazorUI/Tests/Bit.BlazorUI.Tests/Components/Surfaces/Modal/BitModalStylesheetTests.cs
• src/BlazorUI/Tests/Bit.BlazorUI.Tests/Utils/Theme/BitMotionTokenTests.cs
• src/BlazorUI/Tests/Bit.BlazorUI.Tests/Utils/Theme/BitThemeFamilyAliasReSubstitutionTests.cs
• src/BlazorUI/Tests/Bit.BlazorUI.Tests/Utils/Theme/BitThemeMapperContractTests.cs

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