Visualizer3D: clip planes from the camera's distance, not fixed at 20 m

[BioCam]

Both cameras are made with fixed clip planes - the perspective one draws to 20 m, the orthographic one 20 m either side - and only frameBox refits them, for the perspective camera alone. A facility framed whole stands further off than that: a 14 x 22 m lab opens with the camera 29.3 m above it, so the opening plan view, the home button and the PSP / ORT toggle all draw nothing until something closer is focused.

• fitClipping(distance) sizes both cameras' planes from the camera's distance to its target: the perspective camera as frameBox already did (near distance / 1000, far distance * 50), the orthographic one distance * 50 either side
• frameBox calls it for either projection, which covers the opening view, home and focusing a resource
• setProjection calls it, so the toggle keeps drawing what was on screen
• a perspective framing is sized as before; the demo facilities, framed from a few metres, look the same

Tests: browser_tests - a 14 x 22 m facility with four benches draws in its opening plan view, after the projection toggle and after home. It fails without the fix (0.3 % of the viewport drawn).

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