[Application] Fix scenario panel scroll behavior

[95x8x9]

Summary

• Keep the scenario overview and changes cards visually stable by preserving fixed outer card frames while scrolling only the card contents.
• Let the overview and changes sections shrink first and only enable internal vertical scrolling after their minimum heights are reached.
• Prevent the Run section from expanding to consume leftover panel height so the right panel follows the original layout more closely.

Related Issue

• None (application-only PR)

Area

• Engine
• Domain
• Application
• Docs
• Build
• Analysis
• Chore

Architecture Check

• I kept the dependency direction application -> domain -> engine.
• I did not add Qt UI code to src/domain.
• I did not add domain or application dependencies to src/engine.
• I used src/ as the include root.

Verification

• cmake --preset windows-debug
• cmake --build --preset build-debug
• ctest --preset test-debug
• Not run (reason below)
• Verified with cmake --build --preset build-debug --target safecrowd_app

Risks / Follow-up

• Right panel sizing and scroll behavior should still be checked once in the app with narrow vertical space to confirm the cards begin scrolling only after the minimum heights are reached.
• This PR intentionally excludes unrelated local changes in src/application/ProjectPersistence.cpp.