Shower Waterproofing

Question 1: I did a dry pack mortar bed over my concrete floor and used a layer of thinset (MAPEI Keraflex Plus) over the top to fix some slope imperfections. While the slope is now as good as I'll ever get, I have noticed some hairline cracks in the cured thinset (I doubt I could even fit a piece of paper into them). Will this be a problem, or can I go ahead and continue with the liquid Hydro Ban?

Question 2: I sloped the cement board on my window sill using thinset, but I need to know the best way to waterproof the transition to the window frame (it will see plenty of water). The end state is a long composite sill tile on top. Is it okay to use Laticrete Hydro Ban Adhesive & Sealant where the cement board meets the window? I plan to apply it like a caulk bead to seal the gap, let it cure, and then apply the liquid Hydro Ban on top.

Question 3: In the "Dry Pack Shower Pan for Beginners" video series, I noticed there wasn't fabric/mesh tape installed along the seam where the dry pack floor meets the vertical cement board walls. I have already installed alkaline-resistant mesh tape on my vertical seams and curb, but would it be ok to add a bead of that same Hydro Ban Adhesive & Sealant along the floor-to-wall seam for extra security, or is that completely unnecessary?

Thanks for the help!