Support whitespace in component and slot tags

[ganyicz]

The scenario

Laravel's ComponentTagCompiler allows whitespace between < and >:

< x-button >
</ x-button >
< x-slot:header >
</ x-slot >

The problem

The tokenizer matched tags using exact string comparison (<x-, </x-), so any whitespace caused the tag to be missed entirely.

For closing tags, whitespace after the tag was also broken — if the tokenizer didn't find > immediately after tag name, it would consume the whitespace, the >, any text after it, and everything up until the next tag:

<x-button></x-button > some text <x-input />
          |______________________|
                  closing tag

The solution

Changed matchesAt from exact string comparison to regex matching, so the tag matchers can use <\s* and <\/\s* — matching Laravel's ComponentTagCompiler:

// Laravel's ComponentTagCompiler
'<\s*x[-\:]'      // opening tags
'<\/\s*x[-\:]'    // closing tags
'<\s*x[\-\:]slot' // slots

// Ours
$this->match('<\s*' . $prefix)
$this->match('<\/\s*' . $prefix)

Moved the > check outside the name-matching block so whitespace after the tag name is skipped.

Added dedicated TokenizerTest covering tags, slots, whitespace handling, and attributes with angled brackets.