Problem 2: Layer-to-Canvas Ambiguity

[MausRundung]

#171

Problem 2: Layer-to-Canvas Ambiguity

When a workspace has multiple items spread across many layers, it is hard to tell at a glance which item on the canvas belongs to which layer in the sidebar. This leads to "guessing" and clicking through layers to find the right one.

Visual Mapping (Sidebar):

Canvas Selection & Grab Gizmo:

Proposed Solution:
Implement Distinct Layer Coloring and a Selection Gizmo:

• Color Mapping: Assign a unique color to each layer that is reflected in the selection highlight on the canvas. This provides an instant visual link between the "Recipe" (sidebar) and the "Design" (canvas).
• Selection Gizmo: I’ve added a dedicated grab-handle (gizmo) below selected objects. This ensures that even thin vector outlines can be grabbed and moved easily without requiring pixel-perfect clicking.

[knipknap]

This one looks straight forward. Once #176 is done I think this one here looks like a good follow-up.

[knipknap]

The following is now in main:

• Layers can have colors assigned.
• Add a user setting to allow user to choose what the ops colors represent: Layer color or laser color.
• Corner handles show layer color. This only works if all selected workpieces are on the same layer.
• Layer column icon uses layer color as background

[MausRundung]

@knipknap we should reopen this one for the "Grab Gizmo"