1008: Global settings layering and placement adjustments upon shortcut link

[glstott]

This addresses GH issue #1008. Fixes Global Settings dialog stacking and placement when opened from local view settings shortcuts.

Summary of revisions:

• Adds a typed GlobalSettingsDialogRequest that can carry the active tab plus the source settings dialog rect.
• Updates Global Settings opening logic to keep legacy string requests working while raising Global Settings above source dialogs with a higher baseZIndex.
• Adds placement logic that tries right, left, below, then above the source dialog, clamps to viewport, and chooses the least-overlapping visible placement.
• Wires dialog-origin shortcuts in 2D Network, Bubble, Map, and Phylogenetic views to pass click context into the Global Settings opener.
• Adds a focused Cypress regression covering the 2D “Show Colors” flow, asserting both dialogs stay visible, Global Settings is topmost, has higher z-index, and does not overlap on a wide viewport.