STARBackend 96-Head Granular Control Update

[BioCam]

• after initialisation 96-head dispensing drive is 215.92
• after tip pickup -> ALWAYS: 218.19
• after drop tip -> ALWAYS MOVES 215.9 UP !
• empty=True does move the 96-head piston all the way to vol=0 !
• IF slow 96-head dispensing drive flow_rate (~10 uL/sec) is chosen, vol=-25 can be reached

[Copilot]

Pull request overview

This PR adds granular control commands for the STAR backend's 96-head dispensing drive and squeezer driver, enabling more precise control over the hardware's movement and positioning.

Changes:

• Added initialization command for 96-head dispensing drive and squeezer driver with configurable speed, acceleration, and current limits
• Introduced volume-based positioning method for the 96-head dispensing drive
• Defined dispensing drive volume limits as class constants

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