8. Remove the Four Corner Orbs From the 9-Orb Core Grid

The top-left, top-right, bottom-left, and bottom-right orbs in the 9-orb core grid should be removed. The remaining orbs should stay.

Visual target:

• Keep the middle-left, center, middle-right, top-center, and bottom-center positions.
• Remove only the four corner positions.

Current implementation mapping to inspect:

• The present code represents the grid through positioned .orbNode classes, not through a literal grid data structure.
• The likely corner candidates are the family orbs that render at left/top, right/top, left/bottom, and right/bottom. In current class terms, inspect .blueSubTop, .orangeSubTop, .blueSubBottom, and .orangeSubBottom first.
• Do not remove .party, .relik, .culture, .subTop, or .subBottom unless the user explicitly changes the visual target.

Acceptance criteria:

• The Garden visually resolves to five core positions, not nine.
• Remaining orbs preserve the existing smooth entry/surfacing behavior.
• Click targets and surface routing still work after removal.
• Mobile layout remains coherent.