Stir crumbs, sugar, and salt with melted butter until evenly moistened.
Press mixture firmly into a 9-inch springform pan. Chill while you make the filling.
Whip cold heavy cream to medium peaks; set aside.
Beat cream cheese, powdered sugar, vanilla, lemon zest, and lemon juice until smooth and fluffy.
Fold whipped cream into the cream cheese mixture until no streaks remain.
Spread filling over the chilled crust. Smooth the top and refrigerate.
Cook blueberries, sugar, lemon juice, water, and salt over medium heat until juices release, about 4 minutes.
Stir in cornstarch slurry; simmer until glossy and thickened, 2–3 minutes. Off heat, add vanilla. Cool completely.
Spoon cooled blueberry topping over cheesecake. Chill at least 3 hours. Garnish and slice to serve.