Fix locale-sensitive decimal parsing in compiled bash/powershell scripts

[StacheSebastian]

Summary

Both compiler backends parse numeric fields from the statusline JSON (cost,
percentages, timestamps) using APIs that are sensitive to the host's locale.
On any system where , rather than . is the decimal separator (the
majority of non-English locales — German, French, Spanish, Polish, Russian,
Dutch, Nordic languages, Portuguese, Turkish, etc.), this silently corrupts
the rendered statusline instead of erroring:

• Cost — "total_cost_usd": 6.125108349213767 renders as
  $6125108000000000,00 on PowerShell, or fails with printf: invalid number and truncates to $6,00 on bash.
• Rate-limit bars — a used percentage of 2.34 renders as a fully
  filled progress bar (parsed as 234, then clamped to 100).

Root cause

• PowerShell (__costFmt / __bar / __relTime): [double]::TryParse($v, [ref]$n)
  — the 2-arg overload — defaults to NumberStyles.Float | NumberStyles.AllowThousands
  with CultureInfo.CurrentCulture. Under a comma-decimal culture, . is
  the culture's group separator, so AllowThousands silently strips every
  . instead of treating it as a decimal point, concatenating the digits
  into a huge integer.
  (The [double](...) cast used for the gt/lt conditional emitters is
  not affected by this — verified separately — so that code path is
  untouched.)
• Bash (__cost_fmt, and the gt/lt awk conditionals): printf '$%.*f' and awk's string-to-number coercion can honor LC_NUMERIC/
  LC_ALL, so a .-decimal JSON value fails to parse correctly under a
  comma-decimal locale.

Repro

$n = 0.0
[double]::TryParse("6.125108349213767", [ref]$n)  # under a de-DE culture
# $n → 6125108349213770 instead of 6.125108349213767

LC_ALL=de_DE.UTF-8 bash -c 'printf "\$%.2f\n" "6.125108349213767"'
# bash: printf: 6.125108349213767: invalid number
# $6,00   (cents silently dropped)

Fix

Force invariant/C numeric parsing at every point a JSON-sourced decimal
string is converted to a number, regardless of the host's locale:

• PowerShell: added a __toDouble helper using
  [double]::TryParse($v, [NumberStyles]::Float, [CultureInfo]::InvariantCulture, [ref]$n),
  and routed __costFmt, __bar, and __relTime through it.
• Bash: prefixed the __cost_fmt printf call and the gt/lt awk
  conditional checks with LC_ALL=C.

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