More graceful end to the game

The game will not end until no more action happens on the screen.

src/Level.lua

@@ -170,7 +170,7 @@ function Level:updateLogic(dt)
 
 
 	-- Clear board once target time reached
-	if not self.finish and self:areAllObjectivesReached() then
+	if not self.finish and self:areAllObjectivesReached() and not self:hasShotSpheres() and not self:areMatchesPredicted() then
 		self.shooter:empty()
 		_Game.session:destroyAllSpheres(true)
 		self.finish = true
@@ -716,6 +716,21 @@ end
 
 
 
+---Returns `true` if there are any matches predicted (spheres that magnetize to each other), `false` otherwise.
+---@return boolean
+function Level:areMatchesPredicted()
+	for i, path in ipairs(self.map.paths) do
+		for j, chain in ipairs(path.sphereChains) do
+			if chain:isMatchPredicted() then
+				return true
+			end
+		end
+	end
+	return false
+end
+
+
+
 ---Returns `true` if the level has been finished, i.e. there are no more spheres and no more collectibles.
 ---@return boolean
 function Level:getFinish()

src/Shooter.lua

@@ -259,6 +259,10 @@ function Shooter:isActive()
     if self.shotCooldown then
         return false
     end
+    -- FORK-RELATED CHANGE: If the time's up, don't allow to shoot more spheres.
+    if level:areAllObjectivesReached() then
+        return false
+    end
     -- Otherwise, allow.
     return true
 end