[number field] Ensure `onValueChange` is called with already-formatted parsed value

[atomiks]

Fixes #1817

• Uses maximumFractionDigits: 20 when checking to ensure full precision
• Values coming externally have their precision respected as priority until changed via the event handlers, at which point the formatting is respected

Preview: https://codesandbox.io/p/sandbox/base-ui-number-input-blurring-2-forked-crsnw2?file=%2Fsrc%2FApp.tsx

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commit: e65cbdd

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Bundle size report

Total Size Change:^{${\tiny{\color{red}▲}}$}+829B^(+0.06%) - Total Gzip Change:^{${\tiny{\color{red}▲}}$}+255B^(+0.05%) Files: 41 total (0 added, 0 removed, 2 changed)

@base-ui-components/react parsed:^{${\tiny{\color{red}▲}}$}+418B^(+0.14%) gzip:^{${\tiny{\color{red}▲}}$}+120B^(+0.13%) @base-ui-components/react/number-field parsed:^{${\tiny{\color{red}▲}}$}+411B^(+1.45%) gzip:^{${\tiny{\color{red}▲}}$}+135B^(+1.32%)

Details of bundle changes

Generated by :no_entry_sign: dangerJS against e65cbddac06f7844dbf1d44cbb35ffa29ec00d5d