fix(pinia-orm): apply casts before field type validation on save

[CodeDredd]

Bug

When saving, casts for the set operation were applied after $fillField(). The attribute type check therefore validated the raw input and logged spurious warnings like

[Pinia ORM] Field notes:organization_id - 10191 is not a number

even though the cast (e.g. NumberCast) converts the value immediately afterwards and the store ends up with the correct value (#2003).

Fix

Apply the cast before the field is filled, so type validation sees the casted value. Values that fall back to the attribute default (input undefined) still pass through the cast after filling — unchanged behavior. Side effect worth noting: when a field has both a set-mutator and a cast, the mutator now receives the casted value (cast → mutate instead of mutate-after-cast) — this mirrors the get path (mutate → cast) symmetrically.

Tests

New regression test: @Cast(() => NumberCast) @Num(null) field saved with a string value must not warn and must store the number. Fails before, passes after. Full suite green (402 tests).

fixes #2003

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.40%. Comparing base (7a32aec) to head (f05e932).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2029      +/-   ##
==========================================
- Coverage   99.43%   99.40%   -0.04%     
==========================================
  Files          82       82              
  Lines        3022     3025       +3     
  Branches      530      533       +3     
==========================================
+ Hits         3005     3007       +2     
- Misses         14       15       +1     
  Partials        3        3              

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