Changelog for Story Modeller 26.17.0

Changes

• Add an incident to a story without prefilling transitions and steps (PR, #8056)
• Redesign scenario overview page (PR, #7994)
• Add about modal window to root layout (PR, #8054)
• Flush scenario writes to disk before the rename, so that not even a power loss can leave a zero-filled file behind (PR, #8067)
• Unify incident, event and transition template selects into one searchable select with two-line options (PR, #8040)
• Copy incident color from template instead of inheriting it (PR, #8057)