feat: add tui-qrcode crate

[joshka]

This is published to crates.io, but not yet merged due to the Ratatui 0.30 stuff in the main branch.

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (2)

tui-qrcode/README.md:45

• The method call should be 'style(style)' instead of 'style()'.

let widget = QrCodeWidget::new(qr_code).style();

tui-qrcode/examples/qrcode.rs:23

• The error message in the expect method is too generic. Consider providing a more descriptive error message.

let qr_code = QrCode::new("https://ratatui.rs").expect("failed to create QR code");

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 57 lines in your changes missing coverage. Please review.

Project coverage is 71.51%. Comparing base (f272002) to head (aedbd16).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
tui-qrcode/src/lib.rs	0.00%	57 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #56      +/-   ##
==========================================
- Coverage   73.18%   71.51%   -1.67%     
==========================================
  Files          14       15       +1     
  Lines        2446     2503      +57     
==========================================
  Hits         1790     1790              
- Misses        656      713      +57     

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