fix: SvelteKit helper restprops

[ainsleyclark]

Updated Grid components (Row, Column, Container) to use $props() rest destructuring instead of legacy $$restProps for Svelte 5 compatibility.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.80%. Comparing base (7f6b060) to head (91cdc7c).
⚠️ Report is 452 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #370      +/-   ##
==========================================
+ Coverage   64.59%   69.80%   +5.21%     
==========================================
  Files         154      185      +31     
  Lines        6064     7359    +1295     
==========================================
+ Hits         3917     5137    +1220     
+ Misses       2064     2025      -39     
- Partials       83      197     +114     

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