MichelsenTPFlash (Stage 2): apply bound clipping to ny and snap β…

[abcdvvvv]

… to phase boundaries using a small threshold.

FlashResult: update show to print per-phase moles as n (instead of β) to avoid confusion.

Performance enhancement: @view(x[in_equilibria]) may create a non-contiguous (scattered) view, which degrades performance, so we precompute an index vector equilibria_idx for in_equilibria and switch to an explicit element-wise loop to maximize performance

[abcdvvvv]

#465

[codecov]

Codecov Report

❌ Patch coverage is 87.09677% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.04%. Comparing base (7e77779) to head (a7c69a7).

Files with missing lines	Patch %	Lines
...c/methods/property_solvers/multicomponent/flash.jl	0.00%	2 Missing ⚠️
...lvers/multicomponent/tp_flash/Michelsentp_flash.jl	93.10%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #470      +/-   ##
==========================================
- Coverage   76.08%   76.04%   -0.04%     
==========================================
  Files         364      362       -2     
  Lines       31179    31095      -84     
==========================================
- Hits        23723    23647      -76     
+ Misses       7456     7448       -8     

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