So, yes, you could contribute prior to April 15th the difference between your calculated HSA contribution limit and the $1,800. The $100 in the FSA does not apply.
Yes, the healthcare FSA would conflict with your HDHP coverage, because the FSA and the HSA could both pay for the same things.
You are correct that you are not eligible to contribute to your HSA while the FSA is still active in the grace period. This means that you will have to remember to make the HSA contribution between April 1st and April 15th (i.e., after the grace period has expired). But if you are sure you will do this, you can enter the contribution on your 2024 return.
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