fix(toml): handle Infinity/NaN and Date inside inline arrays

[LeSingh1]

Partial fix for #7162.

#arrayDeclaration rendered primitive arrays by calling JSON.stringify(value), which silently turned Infinity / -Infinity / NaN into the literal null and wrapped Date values in extra quotes. Both forms broke round-trip through parse():

toml.stringify({ x: [Infinity, -Infinity, NaN] });
// x = [null,null,null]   (was supposed to be x = [inf,-inf,nan])

toml.stringify({ x: [new Date(0)] });
// x = ["1970-01-01T00:00:00.000"]   (reparsed as a string, not a Date)

The same flaw affected #printAsInlineValue, which is the path for mixed-type arrays — Date values were quoted there too, and non-finite numbers fell through as String(Infinity) / String(NaN) (not valid TOML).

The fix is two small edits:

1. #arrayDeclaration no longer calls JSON.stringify. It maps the array through #printAsInlineValue so primitive arrays use the same TOML literal forms as mixed-type arrays.
2. #printAsInlineValue emits inf / -inf / nan for non-finite numbers and leaves Date values unquoted, matching TOML's datetime literal syntax.

After:

x = [inf,-inf,nan]
x = [1970-01-01T00:00:00.000]
x = [inf,-inf,nan,{}]
x = [1970-01-01T00:00:00.000,{}]

The existing handles mixed array test pinned the buggy date = \"2022-05-13T00:00:00.000\" form inside a nested inline map. Updated to the correct unquoted form (and round-trip verified — parse(stringify(...)) returns a Date instance again instead of a string).

Four new tests cover the issue's specific repros.

Not included in this PR:

• {x: [null]} / {x: [1, null]} — TOML disallows null, and the right behavior (skip vs. throw with a clearer message vs. coerce) is a design call worth its own discussion. Leaving for a follow-up.
• Datetime offset (the trailing Z) — #printDate drops the offset suffix in all TOML output, not just arrays. Restoring it is a broader change touching every Date round-trip and would balloon this PR. Happy to file separately.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.57%. Comparing base (cdf74a8) to head (3de36e2).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7171   +/-   ##
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  Coverage   94.57%   94.57%           
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  Files         636      636           
  Lines       52142    52146    +4     
  Branches     9401     9408    +7     
=======================================
+ Hits        49315    49319    +4     
  Misses       2249     2249           
  Partials      578      578           

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