CNN v2 web tool: Fix static features shader sampling and header offset

Root cause: HTML tool was producing incorrect output vs cnn_test due to:
1. Linear filtering: textureSampleLevel() with sampler blurred p0-p3 features
2. Header offset bug: Used 4 u32 instead of 5 u32 for version 2 binary format

Changes:
- Static shader: Replace textureSampleLevel (linear) with textureLoad (point)
- Bind group: Use 3 separate mip views instead of sampler
- Header offset: Account for version-specific header size (v1=4, v2=5 u32)
- Add version field to weights object for correct offset calculation
- Add savePNG button for convenience

Result: HTML output now matches cnn_test output exactly.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

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