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WASM Binary Optimization and Code Unification#15

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cdvelop wants to merge 2 commits intomainfrom
optimize-wasm-unify-code-18442472867639477928
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WASM Binary Optimization and Code Unification#15
cdvelop wants to merge 2 commits intomainfrom
optimize-wasm-unify-code-18442472867639477928

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@cdvelop cdvelop commented Apr 3, 2026

This PR implements the optimization and unification plan described in docs/PLAN.md to reduce WASM binary size and simplify the codebase. Key changes include the removal of heavy standard library dependencies (crypto/md5, crypto/sha1, time, os) from the WASM build, unification of previously platform-split files, and a fix for JSON decoding of character width slices. All tests pass and the WASM build is verified.


PR created automatically by Jules for task 18442472867639477928 started by @cdvelop

- Eliminated `crypto/md5` from WASM build (Attachments).
- Unified Font and Image ID generation logic, removing `crypto/sha1`.
- Unified Font JSON unmarshaling using `tinywasm/json`.
- Unified time handling to use `int64` (Unix nanoseconds) across all platforms.
- Isolated backend-only dependencies (`os`) using build tags and `_back.go` files.
- Updated `tinywasm/json` to v0.4.1 and `tinywasm/fmt` to v0.22.2 to fix `[]int` decoding.
- Updated tests to match the new unified API.
- Fixed `fontDefType` schema to support `[]int` decoding with `fmt.FieldIntSlice`.

Co-authored-by: cdvelop <44058491+cdvelop@users.noreply.github.com>
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