style: apply ffmt v0.4.0 formatting

[sbryngelson]

Summary

• Pins ffmt==0.4.0 in toolchain/pyproject.toml
• Applies formatting from the newly released ffmt v0.4.0 to 15 Fortran source files
• ffmt was unpinned, so CI would start failing on these files once v0.4.0 is picked up automatically
• Changes are purely cosmetic: continuation line break-point improvements in m_cbc.fpp, m_hypoelastic.fpp, and others

Test plan

• ./mfc.sh precheck passes (all 6 checks)
• CI green

[qodo-code-review]

ⓘ You've reached your Qodo monthly free-tier limit. Reviews pause until next month — upgrade your plan to continue now, or link your paid account if you already have one.

[codecov]

Codecov Report

❌ Patch coverage is 51.85185% with 26 lines in your changes missing coverage. Please review.
✅ Project coverage is 64.95%. Comparing base (f1fd862) to head (8e4c7ea).

Files with missing lines	Patch %	Lines
src/pre_process/m_check_ib_patches.fpp	0.00%	7 Missing ⚠️
src/pre_process/m_icpp_patches.fpp	33.33%	6 Missing ⚠️
src/simulation/m_riemann_solvers.fpp	33.33%	4 Missing ⚠️
src/simulation/m_ibm.fpp	75.00%	3 Missing ⚠️
src/simulation/m_compute_levelset.fpp	0.00%	2 Missing ⚠️
src/simulation/m_ib_patches.fpp	0.00%	2 Missing ⚠️
src/pre_process/m_assign_variables.fpp	0.00%	1 Missing ⚠️
src/pre_process/m_check_patches.fpp	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1431   +/-   ##
=======================================
  Coverage   64.95%   64.95%           
=======================================
  Files          72       72           
  Lines       18880    18879    -1     
  Branches     1573     1571    -2     
=======================================
  Hits        12263    12263           
+ Misses       5641     5640    -1     
  Partials      976      976           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.