fix: allow assignments before tag variables are initialized

[LuLaValva]

Description

Make this work:

button onClick() { x++ } -- ${x}
let/x=0

Checklist:

• I have read the CONTRIBUTING document and have signed (or will sign) the CLA.
• I have updated/added documentation affected by my changes.
• I have added tests to cover my changes.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 2c44ac5

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[codecov]

Codecov Report

Attention: Patch coverage is 99.55752% with 1 line in your changes missing coverage. Please review.

Project coverage is 87.54%. Comparing base (40d4067) to head (10ed125).
Report is 4 commits behind head on main.

Files	Patch %	Lines
packages/translator-tags/src/util/signals.ts	99.29%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2266      +/-   ##
==========================================
+ Coverage   87.51%   87.54%   +0.03%     
==========================================
  Files         333      333              
  Lines       34061    34163     +102     
  Branches     1894     1915      +21     
==========================================
+ Hits        29808    29909     +101     
- Misses       4240     4241       +1     
  Partials       13       13              

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