[RED] Capture failing validation checks for desktop UX/UI acceptance

[ksamaschke]

Phase

RED

## Deliverable
Create failing validation checks and acceptance tests for screenshot-level and interaction-level desktop UX/UI outcomes.

## Dependencies
- Parent work item: #220.

• Blocked by Work Item: Replace dashboard landing with desktop shell frame #211.

• Blocked by Work Item: Align native menu and shortcuts with desktop routes and settings #212.

• Blocked by Work Item: Move app preferences and theme controls into dedicated Settings window #213.

• Blocked by Work Item: Remove main-window appearance popover and route theme changes through Settings #214.

• Blocked by Work Item: Replace tab navigation with persistent sidebar routes #215.

• Blocked by Work Item: Move repository and source management into route-based content #216.

• Blocked by Work Item: Redesign Workspace, Sources, Hooks, and Reports as desktop list/detail flows #217.

• Blocked by Work Item: Migrate plugin contributions from tabs to route and slot APIs #218.

• Blocked by Work Item: Preserve theme mode, accent, and background customization within the desktop shell #219.

  Completion evidence

  • Failing validation checks or tests naming the required visible desktop outcomes.

• Coverage references for screenshots, interaction checks, and themed variants.

  Acceptance criteria

  • Validation fails until the visible desktop UX/UI outcomes exist.

• The acceptance matrix is specific enough to prevent infrastructure from being mistaken for completion.

  Parent: Work Item: Add screenshot-level validation and desktop acceptance checks #220