Add number of split integration time steps to summary

[efaulhaber]

Before

#timesteps:    150 │ Δt: 5.5812e-03 │ sim. time: 6.1501e-01 (61.501%)  │ run time: 3.0417e+00 s
#timesteps:    200 │ Δt: 5.9424e-03 │ sim. time: 8.5756e-01 (85.756%)  │ run time: 3.1432e+00 s
────────────────────────────────────────────────────────────────────────────────────────────────────
Trixi simulation finished.  Final time: 1.0  Time steps: 231 (accepted), 231 (total)
────────────────────────────────────────────────────────────────────────────────────────────────────

──────────────────────────────────────────────────────────────────────────────────────────
           TrixiParticles.jl                     Time                    Allocations      
                                        ───────────────────────   ────────────────────────
           Tot / % measured:                 3.31s /  51.4%            736MiB /  59.9%    

With split integration:

────────────────────────────────────────────────────────────────────────────────────────────────────
Trixi simulation finished.  Final time: 0.01  Time steps: 60 (accepted), 60 (total)
────────────────────────────────────────────────────────────────────────────────────────────────────

Now

────────────────────────────────────────────────────────────────────────────────────────────────────
Trixi simulation finished.
  Final time:                            1.0
  Time steps:                            231 (accepted)        231 (total)
────────────────────────────────────────────────────────────────────────────────────────────────────

With split integration:

────────────────────────────────────────────────────────────────────────────────────────────────────
Trixi simulation finished.
  Final time:                           0.01
  Time steps:                             60 (accepted)         60 (total)
  Split integration time steps:         1960 (accepted)       1960 (total)
────────────────────────────────────────────────────────────────────────────────────────────────────

[Copilot]

Pull request overview

The PR improves the simulation finish summary printed by InfoCallback, switching to a vertically aligned multi-line format and adding a new line that reports accepted/total time steps from the inner split-integration integrator when present.

Changes:

• Reformat the "simulation finished" summary using @printf with column alignment.
• Add a new "Split integration time steps:" line when integrator.p.split_integration_data is not nothing.
• Extend the info callback tests to cover both the standard and split-integration cases.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/callbacks/info.jl	Rewrites print_summary with @printf formatting and conditionally prints split-integration step counts.
test/callbacks/info.jl	Updates the existing finished-summary test for the new format and adds a new testset for the split-integration case.

---

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[codecov]

Codecov Report

❌ Patch coverage is 75.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.87%. Comparing base (5d46487) to head (d988b53).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
test/callbacks/info.jl	33.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1194      +/-   ##
==========================================
- Coverage   89.88%   89.87%   -0.02%     
==========================================
  Files         133      133              
  Lines       10452    10459       +7     
==========================================
+ Hits         9395     9400       +5     
- Misses       1057     1059       +2     

Flag	Coverage Δ
total	89.87% <75.00%> (-0.02%)	⬇️
unit	70.49% <75.00%> (+<0.01%)	⬆️

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