feat(operate): a Raise head button beside HALT on the SPIM head

[pskeshu]

in spim head surface in operate panel, along with the HALT button, we also need a button to raise the spim head to 25000 - a reset button or something.

A Raise head button on the SPIM head gauge, beside HALT. It moves the F-drive to its own top limit — 25000 µm, the "Load Sample" height. No number comes from the request: the top is the device's (fdrive.limits), so nothing a client sends can pick a height.

• Device layer: POST /api/spim/fdrive/raise. The move runs off the loop with the state poller backed off, exactly as a nudge does, so HALT stays live for the whole traverse.
• Client: raise_fdrive(). Agent: POST /api/devices/spim/fdrive/raise (control role).
• Pane: the button says "Raising…" while it travels, a toast says where the head came to rest, the gauge refreshes, and the head is no longer counted as lowered for the interlock.

Ten tests in tests/test_spim_head_raise.py: the handler moves to the device's limit and reports from/to, backs the poller off and restores it, 503 without the axis, a refused move reported; the route asks the client; the button sits beside HALT and is wired in wire().

Not exercised on hardware — verify on the rig that the full traverse completes within the client's timeout (the F-drive's own move timeout is 120 s).

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