Improve theme infra of BitFileInput (#13322)

[msynk]

closes #13322

Summary by CodeRabbit

• New Features

  • Added folder selection and drag-and-drop path support, including folder-aware duplicate detection and file path display.
  • Added on-demand streaming access for file contents.
  • Added customizable file icons, image preview controls, titles, and shared parameter configuration.
  • Improved file names, extensions, invalid-file states, and folder indicators.

• Accessibility & Usability

  • Improved keyboard navigation, focus restoration, labels, disabled states, and screen-reader descriptions.
  • Added enhanced styling customization through CSS variables.

• Documentation

  • Expanded demos and guidance for streaming, previews, icons, folder selection, accessibility, and customization.

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Walkthrough

Changes

BitFileInput behavior

Layer / File(s)	Summary
File metadata and streaming src/BlazorUI/Bit.BlazorUI/Components/Inputs/FileInput/BitFileInputInfo.cs, src/BlazorUI/Bit.BlazorUI/Components/Inputs/FileInput/BitFileInput.ts, src/BlazorUI/Bit.BlazorUI/Components/Inputs/FileInput/BitFileInput.razor.cs, src/BlazorUI/Bit.BlazorUI/Components/Inputs/FileInput/BitFileInputJsRuntimeExtensions.cs	File items preserve folder-relative paths. Duplicate identity includes RelativePath. OpenReadStreamAsync opens browser-backed streams through JavaScript interop.
File list rendering and focus handling src/BlazorUI/Bit.BlazorUI/Components/Inputs/FileInput/BitFileInput.razor, src/BlazorUI/Bit.BlazorUI/Components/Inputs/FileInput/BitFileInput.razor.cs, src/BlazorUI/Bit.BlazorUI/Components/Inputs/FileInput/BitFileInputClassStyles.cs	The component renders browse and remove-button attributes, folder paths, file icons, split names, and full-path labels. Removal and reset operations clear references and restore focus.
Theme and accessibility styling src/BlazorUI/Bit.BlazorUI/Components/Inputs/FileInput/BitFileInput.scss	Public CSS variables control component colors, sizes, spacing, previews, icons, drop indicators, invalid states, and remove buttons. Focus-visible and forced-colors styles are added.
Cascading configuration src/BlazorUI/Bit.BlazorUI/Components/Inputs/FileInput/BitFileInputParams.cs, src/BlazorUI/Bit.BlazorUI/Components/Inputs/FileInput/BitFileInput.razor.cs	BitFileInputParams supplies unset component parameters through BitParams. Direct component parameters remain authoritative.
Demo and documentation updates src/BlazorUI/Demo/Client/Bit.BlazorUI.Demo.Client.Core/Pages/Components/Inputs/FileInput/*	The demo consolidates examples and documents folder paths, file icons, streaming, cascading parameters, accessibility behavior, and CSS variables.
Component validation src/BlazorUI/Tests/Bit.BlazorUI.Tests/Components/Inputs/FileInput/BitFileInputTests.cs	Tests cover rendering attributes, validation, folder paths, icons, focus restoration, streaming argument validation, and cascading parameters.

Priority: ➖ Normal

Estimated code review effort: 4 (Complex) | ~60 minutes

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant User
  participant BitFileInput
  participant Browser
  participant .NET
  User->>BitFileInput: Select or drop files
  BitFileInput->>Browser: Preserve relative paths
  Browser-->>BitFileInput: File metadata and identifiers
  .NET->>BitFileInput: OpenReadStreamAsync(fileInfo)
  BitFileInput->>Browser: Request browser-backed stream
  Browser-->>.NET: Return chunked stream

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Merge Risk: 🔵 Low · up to 23f09

Changing cascaded HideLabel values can render the drop indicator incorrectly. The localized cache reset should be applied before merging.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 24.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 50 functions across 9 files. (3 skipped: …	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies BitFileInput theme infrastructure as the primary change. It is concise and related to the pull request objectives, including theme tokens and public CSS variables.
Linked Issues check	✅ Passed	The pull request addresses the coding objectives in issue #13322. BitFileInput.scss defines documented public --bit-FileInput-* variables with theme-token fallbacks and adds focus, disabled, inval…
Out of Scope Changes check	✅ Passed	The changed files are limited to BitFileInput implementation, styling, JavaScript interop, public supporting models, the BitFileInput demo and documentation data, and component tests. Streaming, fol…

Full details: Docstring Coverage

Explanation

Docstring coverage is 24.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 50 functions across 9 files. (3 skipped: 3 unsupported.)

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_{A rabbit taps the browse control bright
Folder paths hop into view just right
Icons bloom where previews hide
Streams flow in a gentle tide
Focus returns after files depart
CSS colors warm the component’s heart}

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Actionable comments posted: 1

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Inline comments:
In `@src/BlazorUI/Bit.BlazorUI/Components/Inputs/FileInput/BitFileInputParams.cs`:
- Around line 334-337: Reset the cached class builder after applying a cascaded
HideLabel value in UpdateParameters. Update the HideLabel handling for
bitFileInput so ClassBuilder.Reset() runs when the field is assigned, preserving
correct browse-button styling after HideLabel changes.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Advanced

Run ID: 6e0f9dfb-3873-4948-b637-b36d5e851f46

📥 Commits

Reviewing files that changed from the base of the PR and between d1fce57 and 23f09b7.

📒 Files selected for processing (12)

• src/BlazorUI/Bit.BlazorUI/Components/Inputs/FileInput/BitFileInput.razor
• src/BlazorUI/Bit.BlazorUI/Components/Inputs/FileInput/BitFileInput.razor.cs
• src/BlazorUI/Bit.BlazorUI/Components/Inputs/FileInput/BitFileInput.scss
• src/BlazorUI/Bit.BlazorUI/Components/Inputs/FileInput/BitFileInput.ts
• src/BlazorUI/Bit.BlazorUI/Components/Inputs/FileInput/BitFileInputClassStyles.cs
• src/BlazorUI/Bit.BlazorUI/Components/Inputs/FileInput/BitFileInputInfo.cs
• src/BlazorUI/Bit.BlazorUI/Components/Inputs/FileInput/BitFileInputJsRuntimeExtensions.cs
• src/BlazorUI/Bit.BlazorUI/Components/Inputs/FileInput/BitFileInputParams.cs
• src/BlazorUI/Demo/Client/Bit.BlazorUI.Demo.Client.Core/Pages/Components/Inputs/FileInput/BitFileInputDemo.razor
• src/BlazorUI/Demo/Client/Bit.BlazorUI.Demo.Client.Core/Pages/Components/Inputs/FileInput/BitFileInputDemo.razor.cs
• src/BlazorUI/Demo/Client/Bit.BlazorUI.Demo.Client.Core/Pages/Components/Inputs/FileInput/BitFileInputDemo.razor.samples.cs
• src/BlazorUI/Tests/Bit.BlazorUI.Tests/Components/Inputs/FileInput/BitFileInputTests.cs

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