feat: add completions for nushell and fig by clap

[jasonxue1]

No description provided.

[jasonxue1]

@akiomik
github actions works normally.

• https://github.com/jasonxue1/mado/actions/runs/17693652018
• https://github.com/jasonxue1/mado/actions/runs/17693652015

[codecov-commenter]

Codecov Report

❌ Patch coverage is 64.81481% with 19 lines in your changes missing coverage. Please review.
✅ Project coverage is 99.12%. Comparing base (df0264a) to head (883190b).

Files with missing lines	Patch %	Lines
src/main.rs	18.18%	18 Missing ⚠️
src/command.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #203      +/-   ##
==========================================
- Coverage   99.37%   99.12%   -0.25%     
==========================================
  Files          73       73              
  Lines        7166     7189      +23     
==========================================
+ Hits         7121     7126       +5     
- Misses         45       63      +18     

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[akiomik]

Good catch🥳 I'm sorry, but I'm busy with personal matters, so please give me some time for the review