Fix: Correct fastest minifier label from ESBuild to OXC

[Copilot]

The minification benchmarks page displayed conflicting information about the fastest minifier—the top stats card showed "ESBuild" while the bottom section correctly showed "OXC".

Analysis

Benchmark data across 12 libraries shows OXC is fastest among popular minifiers:

Minifier	Avg Time
oxc-minify	116.47ms
esbuild	122.12ms
@swc/core	304.46ms
terser	2628.89ms
uglify-js	2941.26ms

Changes

• Updated MinificationBenchmarksPage.tsx line 41 to display "OXC" instead of "ESBuild"

Screenshots

Before:

After:

Original prompt

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This section details on the original issue you should resolve

<issue_title>ESBuild is (currently) faster than OXC</issue_title>
<issue_description>https://voidzero-dev.github.io/vibe-dashboard/#/minification

The stats and the "Fastest minifier" at the beginning of the page say ESBuild is faster than OXC, while the end of the page says OXC is a faster minifier.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes ESBuild is (currently) faster than OXC #97

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