UI Cleanup and Dark Mode Fixes

[matKlju]

AS A Service-Module admin
I WANT UI inconsistencies, dark mode issues, and minor UX problems to be fixed
SO THAT the system is visually consistent, readable, and easier to use without unnecessary friction

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Description

This task consolidates multiple small UI bugs and inconsistencies into a single cleanup effort.

Focus areas:

• Dark mode rendering fixes
• Visibility and usability improvements
• Naming and label standardization
• Removal of unnecessary UI elements

No new functionality is introduced.

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Acceptance Criteria

Dark Mode Fixes

• Dark mode does not bleed from canvas view to overview page
  • Dark mode should be contained on canvas view

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• Test widget response should clearly visible in dark mode

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• Remove invisible overlay/bar covering test widget response area
  • Response area displays full area.

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• Remove residual toast element visible in bottom-right corner in dark mode

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Element / Config Cleanup

• Remove all "Test / Testimine" tabs from:
  • Assign
  • MTC (Message to client)
  • Condition
  • MCQ
  • Dynamic choice

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Label & Naming Standardization

• Rename:
  • "Assign Elements / Määra Elemendid" → "Assigned Variables / Määratud Väärtused"

• Rename:
  • "Service Configuration / Teenuse seaded" → "Settings / Seaded"

• Rename:
  • "Import many / Impordi mitu" → "Import / Impordi"
  • "Export many / Ekspordi mitu" → "Export / Ekspordi"

• Rename:
  • "+ Element" → "+ New variable / + Uus väärtus"

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Settings Modal Improvements

• Fix positioning of ":" in "Examples / Näidisküsimused"

• Update tooltip for "Sample questions / Näidisküsimused":
  • Add:
    • "It is recommended to include at least 5 examples."
    • "Soovituslik on lisada vähemalt 5 näidet"

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Canvas Visibility & UX

• Increase node visibility on selection
• Increase edge visibility on selection
• Fix "Date & time / Separator dropdown" going out of bounds