fix: Weird Parser Error

[notJoon]

Description

This PR was originally supposed to be a Matcher feature implementation, but became a Another Parser Fix PR.

Fixes

• Text scanning logic improvement Simplified the approach of checking text segments with character-by-character FSM transitions. Now it immediately closes and returns the text token when encountering boundary characters. This prevents issues of generating empty tokens or "no text found at position X" errors.
• State transition table correction Modified transitions from text states (TX, WS) so that characters like :, [, ] transition to "metavariable/block start" states instead of error (ER) states. This enables proper text segment termination and continued metavariable parsing in expressions like "hello :[var]".