feat(units)!: improve unit system and quantity additions

[tmlmt]

Description

Improved unit conversion and quantity display with a new "best unit" algorithm that intelligently selects the most appropriate unit for displaying quantities. This enhancement makes recipes more readable by using natural units and fractions where appropriate.

Resolves: #52

Type of change

• New feature (non-breaking change which adds functionality)
• Enhancement (refactoring, style or performance improvement)
• Documentation change (improvement to the Vitepress documentation or playground)

Breaking Changes

None. The changes maintain backward compatibility while improving the display of quantities.

How Has This Been Tested?

• Added comprehensive unit tests for the new best unit algorithm
• Added tests for fraction approximation and display
• Verified existing recipe parsing tests pass with the new unit selection logic
• Tested recipe scaling with various unit combinations

Checklist:

• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have run pnpm lint and my changes generate no new warnings
• New and existing unit tests pass locally with my changes

[tmlmt]

• feat: full-recipe unit conversion #97
• chore(playground): remove passing of invalid prop in IngredientItem #96
• feat(units)!: improve unit system and quantity additions #95 👈 (View in Graphite)
• v3

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[tmlmt]

Merge activity

• Jan 30, 11:52 AM UTC: A user started a stack merge that includes this pull request via Graphite.
• Jan 30, 11:52 AM UTC: @tmlmt merged this pull request with Graphite.