Switch to FNV-1a hash for CSS identifiers

[jantimon]

This PR replaces our current CSS identifier hashing implementation with FNV-1a (Fowler-Noll-Vo), a fast and platform-independent hash function that is better suited for generating CSS identifiers.

Changes

• Replace custom hash implementation with FNV-1a algorithm
• Improve CSS identifier generation to ensure valid CSS class names
• Update tests with deterministic hash values
• Update snapshots to reflect new hash output format

Why FNV-1a?

The FNV-1a hash algorithm is an ideal choice for this use case because:

1. Deterministic Output: Guarantees consistent hashes across:

   • Different operating systems (Windows/Mac/Linux)
   • Different architectures (x86/ARM/WASM)
   • Different builds and process executions

2. Performance: FNV-1a is:

   • Simple and fast (uses basic bitwise operations)
   • Memory efficient (operates on bytes directly)
   • Well-suited for short strings like class names

3. Distribution: Provides excellent distribution characteristics for:

   • Short strings (like component names)
   • Similar strings (like nested selectors)
   • Small changes in input

CSS Identifier Format

The new hash format:

- y_17k2ec6  // old format
+ ymdkqtp     // new format

Changes to identifier generation:

• Always starts with a lowercase letter (CSS requirement)
• Uses 6 characters for consistent length
• Utilizes base62 encoding (a-z, A-Z, 0-9) for maximum readability
• Maintains uniqueness while being shorter

[codspeed-hq]

CodSpeed Performance Report

Merging #205 will not alter performance

_{Comparing hashing-switch-to-fnv1a_64 (f9d41fb) with main (da220f2)}

Summary

✅ 2 untouched benchmarks

[changeset-bot]

🦋 Changeset detected

Latest commit: f9d41fb

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
yak-swc	Minor
next-yak	Patch

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