Parametrise Integration Tests

[Waguramu]

TODOs:

• Make sure the tests run faster / do not idle requesting the tiles.
• Combine snapshot tests together where possible.
• Enable the second view to initialise with the first view's parameters when opened.

[github-actions]

Vitest coverage

• Lines: 56.7% (4041/7126)
• Statements: 56.7% (4041/7126)
• Functions: 44.8% (270/603)
• Branches: 71.5% (699/977)

Artifact: https://github.com/ndsev/erdblick/actions/runs/21030416467

[Waguramu]

• Use dark mode
• Use more area/full page for snapshots for visual appeal.
• Make sure to eliminate the issues with locating editor dialogue due to attach to body property.
• Use maps panel + map + docked inspections for the main snapshot.
• Possibly highlight selected locators.
• Introduce a snapshot for the basic layout without the map panel.
• Try to reproduce Source Data snapshots.
• Add projection change, style change (and perspective change) to the multi-view snapshot.
• Add two separate snapshots for style controls and style editor.