Add compression diff viewer to Vortex Web

[joseph-isaacs]

Summary

Add an interactive compression-output comparison to Vortex Web. The viewer compares whole-file, data, and metadata sizes, then semantically aligns layout and array-encoding trees so an inserted field does not make every following field appear changed.

The Explorer remains a static application. Hash routes provide shareable links for an individual HTTP(S) Vortex file or a baseline/candidate pair, and either comparison side can be opened in the normal explorer or replaced with another local file.

Array encoding trees are streamed from the decoded array into JSON one node at a time through the traversal introduced by #9612. The WASM bridge no longer constructs a recursive Rust JSON tree before serialization.

Stack

1. Add compression diff viewer with streaming array trees #9612 — streaming array-tree traversal shared by display backends.
2. This PR — Vortex Web JSON backend, compression diff viewer, and deep links.

Changes

• Add semantic layout and array-encoding tree diffing with changed, added, removed, and unchanged states.
• Add the comparison UI with byte deltas, schema/row-count warnings, changes-only filtering, and controls to view or replace either file.
• Add hash-based routes for Details, Swimlane, Compare, individual remote files, and remote comparison pairs.
• Load comparison files in separate Web Workers so tree expansion and previews target the selected file.
• Stream decoded array trees directly to JSON without a recursively allocated Rust intermediate tree.
• Carry each array child's name on the child node so traversal does not collect parallel child-name and child arrays.
• Add focused unit coverage for route/deep-link resolution, semantic tree matching, and one-pass JSON serialization.

Checks

• npm run wasm
• npm test
• npm run format:check
• npm run lint
• npm run typecheck
• cargo test -p vortex-web-wasm
• cargo check -p vortex-web-wasm --target wasm32-unknown-unknown
• cargo clippy -p vortex-utils -p vortex-array -p vortex-web-wasm --all-targets --all-features
• git diff --check

Workspace-wide Clippy was also attempted, but the unrelated vortex-nvcomp build script could not download NVIDIA nvCOMP.

[codspeed-hq]

Merging this PR will degrade performance by 7.63%

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

⚡ 1 improved benchmark
❌ 3 regressed benchmarks
✅ 2093 untouched benchmarks
⏩ 106 skipped benchmarks¹

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	WallTime	arrow_checked_add_u32_avx512[16384]	17.6 µs	21.2 µs	-17.06%
❌	WallTime	words_gather_scalar_avx2[65536]	8.2 µs	9.4 µs	-12.48%
❌	Simulation	cold_misaligned[(16, 64)]	347.3 µs	388.7 µs	-10.65%
⚡	WallTime	mul_u32_nonnull_avx512	6.3 µs	5.6 µs	+12.27%

Tip

Investigate this regression by commenting @codspeedbot fix this regression on this PR, or directly use the CodSpeed MCP with your agent.

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_{Comparing ji/compression-diff-viewer (f1e802d) with ji/streaming-array-tree (591d234)²}

Footnotes

1. 106 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

2. No successful run was found on ji/streaming-array-tree (f1e802d) during the generation of this report, so 2ee7b20 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩