Fix SQL parsing and HTML review findings

[PaulStSmith]

Summary

• Ignore SQL Server double-at system variables during DBAccess parameter parsing
• Add regression coverage for ROWCOUNT-style system variables beside regular bind parameters
• Address Copilot findings in the legacy HTML asset scope already present on this branch

Verification

• node --check on updated HTML JavaScript files
• Focused DBAccess parameter parser tests passed for net48 and net9.0

[Copilot]

Pull request overview

Updates DBAccess SQL parameter parsing to avoid treating SQL Server @@... system variables as bind parameters, and adds a new set of static HTML/CSS/JavaScript UI framework assets with documentation.

Changes:

• Refines DBAccess parameter parsing regexes to exclude SQL Server @@ system variables (e.g., @@ROWCOUNT) while still capturing normal @Param binds.
• Adds a regression unit test covering @@ROWCOUNT mixed with regular bind parameters.
• Introduces a repo-level HTML/ UI framework (CSS + JS components) and accompanying migration/docs updates.

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 15 comments.

Show a summary per file

File	Description
Toolkit.Modern/Data/Database/DBAccess.Parameters.cs	Regex refactor to avoid parsing @@... system variables as bind parameters.
Toolkit.Modern.Tests/Unit/Data/Database/DBAccessParameterParsingSimpleTests.cs	Adds regression coverage ensuring @@ROWCOUNT doesn’t produce @ROWCOUNT.
MIGRATION-legacy-toolkit.md	Documents new repo-level HTML/ asset folder and doc location.
HTML/README.md	Adds UI framework overview and usage notes.
HTML/JavaScript/README.md	Documents the browser-side helper scripts and integration guidance.
HTML/JavaScript/ByteForge-utilities.js	Adds general client-side utilities (validation, clipboard, security hardening).
HTML/JavaScript/ByteForge-tri-state-toggle.js	Adds a tri-state toggle UI component.
HTML/JavaScript/ByteForge-multi-selector.js	Adds a two-list selector helper component.
HTML/JavaScript/ByteForge-modal.js	Adds a modal/notification system component.
HTML/JavaScript/ByteForge-calendar.js	Adds a custom date picker widget component.
HTML/JavaScript/ByteForge-bulk-processor.js	Adds a preview-then-apply bulk workflow controller.
HTML/CSS/ByteForge-ui.css	Adds styling for the new UI framework components (modal, calendar, toggles, etc.).
Docs/HTML.md	Adds a documentation copy for the UI framework.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.