Update dependencies and adopt TypeScript 7

[KayleeWilliams]

Bump typescript to 7.0.2, @types/node to 26.2.0, oxfmt to 0.63.0,
oxlint to 1.78.0, ultracite to 7.10.2 and @changesets/cli to 2.31.1.

TypeScript 7 is the released native compiler port and no longer exports
the compiler JS API from the package root, which breaks the
rollup-plugin-dts that tsup uses for declaration generation. Declarations
are now emitted by tsc via tsconfig.build.json after tsup bundles the
JavaScript. The exported type surface is unchanged.

Since TypeScript 7 is the release of the port that @typescript/native-preview
previewed, drop that package and typecheck with tsc so the same compiler
is used for building and checking.

The newer oxlint and oxfmt add rules that required source changes:
named capture groups in the perf report parser, a direct re-export in the
oxfmt config, and markdown reflowing. unicorn/prefer-number-coercion is
disabled because Math.trunc(Number(x)) does not match the Number.parseInt
semantics the CLI argument parsing relies on.

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