Fix vscode lsp bugs

[jessfraz]

• the adding of ${} at the end is now done on the code mirror side, we have playwright test autocomplete works so this is fine
• added a test for untitled file thing and allowed it from the vscode plugin side

closes #6260 #6259

[qa-wolf]

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[vercel]

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Name	Status	Preview	Updated (UTC)
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[codecov]

Codecov Report

Attention: Patch coverage is 98.83041% with 2 lines in your changes missing coverage. Please review.

Project coverage is 84.93%. Comparing base (3584484) to head (bb15580).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
rust/kcl-lib/src/docs/kcl_doc.rs	33.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6271      +/-   ##
==========================================
+ Coverage   84.89%   84.93%   +0.04%     
==========================================
  Files         109      109              
  Lines       44964    45104     +140     
==========================================
+ Hits        38171    38311     +140     
  Misses       6793     6793              

Flag	Coverage Δ
rust	84.93% <98.83%> (+0.04%)	⬆️

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[codspeed-hq]

CodSpeed Walltime Performance Report

Merging #6271 will degrade performances by 13.94%

_{Comparing fix-vscode-lsp (bb15580) with main (df6f571)}

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

Summary

⚡ 4 improvements
❌ 4 regressions
✅ 84 untouched benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
❌	execute_80-20-rail	3.4 s	4 s	-13.94%
⚡	execute_car-wheel-assembly	20.4 s	18.5 s	+10.7%
⚡	parse_color-cube	2.8 ms	2.4 ms	+14.82%
❌	execute_french-press	4.2 s	4.6 s	-10.26%
❌	execute_gridfinity-baseplate	2.4 s	2.8 s	-11.56%
❌	execute_kitt	4.6 s	5.1 s	-10.38%
⚡	parse_router-template-cross-bar	6.3 ms	5.2 ms	+20.85%
⚡	parse_router-template-slate	4.2 ms	3.5 ms	+19.83%

[jtran]

Awesome!