Rework speed certificates: per-group speed tracking, per-stage single…

[mashu]

…-session copy runs with progress, full-alphabet trophies

[codecov]

Codecov Report

❌ Patch coverage is 69.18239% with 49 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.33%. Comparing base (1541ccd) to head (b246dc1).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
src/components/ui/training/NextGoalCard.tsx	17.94%	24 Missing and 8 partials ⚠️
...components/features/training/TeachingPlanPanel.tsx	52.17%	10 Missing and 1 partial ⚠️
src/lib/curriculum/index.ts	66.66%	2 Missing ⚠️
src/lib/curriculum/speedCertificates.ts	96.96%	2 Missing ⚠️
src/hooks/useTrainingSession.ts	90.00%	1 Missing ⚠️
src/lib/achievements/evaluateAchievements.ts	88.88%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #7      +/-   ##
==========================================
- Coverage   72.41%   72.33%   -0.08%     
==========================================
  Files         147      148       +1     
  Lines       10454    10580     +126     
  Branches     3529     3588      +59     
==========================================
+ Hits         7570     7653      +83     
+ Misses       2798     2645     -153     
- Partials       86      282     +196     

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