[tailwindcss-vite] Add Register dependency messages logline

[timneutkens]

The PostCSS implementation has a debug logline for registering dependencies but this is missing for @tailwindcss/vite.

Summary

Adds the "Register dependency messages" instrumentation span to the Vite plugin's dependency registration code, matching the existing implementation in @tailwindcss/postcss.

This ensures consistent debug instrumentation across both bundler integrations when DEBUG is enabled.

Test plan

[coderabbitai]

Walkthrough

The change adds debug instrumentation to the Tailwind CSS Vite plugin. When the Utilities feature is enabled, the code now wraps the dependency-watching process with labeled logging. A start log is emitted before scanning files and a corresponding end log is emitted after processing both files and glob patterns. This instrumentation does not alter the functional behavior of dependency watching; it only adds observability around the dependency registration sequence.

🚥 Pre-merge checks | ✅ 2

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely summarizes the main change: adding a Register dependency messages logline to the tailwindcss-vite plugin.
Description check	✅ Passed	The description is directly related to the changeset, explaining the motivation and goal of adding instrumentation to match the PostCSS implementation.

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