sonirico / go-hyperliquid / 33382103020

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fix: don't silently use 0 when a wire price/size fails to parse (#172)

parseFloat returns 0.0 on any parse error. Two financial call sites relied
on it for values coming off the API:

- SlippagePrice (market order price): a malformed mid price became a market
  order priced at 0, with no error.
- MarketClose (position size): a malformed pos.Szi became size 0 (a no-op /
  wrong close).

Add parseFloatStrict (error-returning) and use it at both sites, which both
already return an error. parseFloat is unchanged for its display callers, so
this is non-breaking. Adds a unit test contrasting the two parsers.

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