Add canonical class fix-all actions for files and workspaces

[TurtIeSocks]

Summary

Adds bulk-fix support for Tailwind canonical class suggestions in two places:

1. a standard LSP fix-all code action for the current file
2. a VS Code command to apply canonical class suggestions across the current workspace folder

What changed

File-level fix all

Before:

• users only saw one warning fix at a time, like Replace with 'print:flex'

After:

• users still get the single-instance quick fixes
• users also get a standard Tailwind fix-all code action for the current file:
  • Fix all Tailwind CSS canonical class suggestions

Workspace-level fix all

Before:

• there was no built-in way to apply canonical class suggestions across multiple files in the workspace

After:

• there is a new command:
  • Tailwind CSS: Fix Canonical Class Suggestions in Workspace
• it scans the current workspace folder and applies canonical class suggestions across all matching files
• it skips Git-ignored files

Implementation details

• added source.fixAll.tailwindcss support to the language server code actions
• kept the existing per-warning quick fixes intact
• advertised Tailwind fix-all support through server capabilities
• added a VS Code command that requests per-file Tailwind fix-all actions from the language server and merges them into one workspace edit
• filtered workspace scans to ignore Git-ignored files

Examples

Before:

<div class="[@media_print]:flex [color:red]/50 mt-[16px]"></div>

After:

<div class="print:flex text-[red]/50 mt-4"></div>

In a single file:

• the new fix-all action applies all canonical replacements in that document

Across a workspace:

• the new command applies the same kind of fixes across all non-gitignored files in the current workspace folder

Testing

• added language-server tests covering the new file-level fix-all action
• added capability coverage for advertised Tailwind fix-all support
• rebuilt @tailwindcss/language-service
• rebuilt @tailwindcss/language-server
• rebuilt vscode-tailwindcss

Notes

• the file-level behavior follows the review feedback on the earlier PR by using a standard LSP fix-all action instead of a custom command
• workspace-wide fixing is implemented as a separate VS Code command because LSP textDocument/codeAction is document-scoped

Supersedes #1508

[chatgpt-codex-connector]

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