Adds a dark expanding sphere around the repair model when the player
enters the immersive repair phases (fragmented / scanning / repairing /
reassembling). The bubble grows from 0 to 10m using GSAP expo.out over
2.5s and reverses on focus end, visually isolating the player from the
surrounding map.
- New useRepairFocusStore tracks active state + world center.
- New RepairFocusBubble renders a BackSide sphere shell + a soft cocoon
decor pass (grid floor + directional light + ambient) inside.
- RepairGame drives setFocus from its lifecycle effect.
- Mounted in both GameStageContent and TestMap so behaviour matches in
the production scene and the physics test scene.
Also drops the now-unused EBIKE_CONFIG_KEY constant in
GameStageContent.tsx (leftover from a previous remount-key strategy).
Tom Boullay