Stabilize console workspace layout, theming, and console sizing

[Copilot]

The modular console workspace regressed: cards showed double surfaces, the console body didn’t fill its card, layouts could balloon vertically, and default graph height was too small.

• Layout & defaults

  • Keep the 12-col preset with console left and graphs right; raise graph h to 8 (frontend/backend defaults).

• Grid behavior

  • Re-enable compact-to-top normalization on drag/resize with vertical compaction to prevent runaway grid height.

• Styling

  • Make grid items transparent and use a single module content wrapper; editable state uses a dashed border (no nested surfaces).

• Console fill

  • Module content wrapper is flex/min-h-0 so the console fills its card.

Example layout entries:

{ "id":"console","x":0,"y":3,"w":9,"h":18,"minW":6,"minH":6 }
{ "id":"cpuGraph","x":9,"y":3,"w":3,"h":8,"minW":3,"minH":2 }
{ "id":"memoryGraph","x":9,"y":11,"w":3,"h":8,"minW":3,"minH":2 }
{ "id":"networkGraph","x":9,"y":19,"w":3,"h":8,"minW":3,"minH":2 }

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