Update plugin references from Rojo to Atlas

- Changed all instances of "Rojo" to "Atlas" in error messages, UI titles, and connection actions for consistent branding.
- Updated the sound player widget and patch history recording to reflect the new name.
- Enhanced logging in the hydration process to provide better diagnostics for missing virtual instances.

plugin/src/Reconciler/hydrate.lua

@@ -3,6 +3,9 @@
 	concrete instances and assigning them IDs.
 ]]
 
+local Packages = script.Parent.Parent.Parent.Packages
+local Log = require(Packages.Log)
+
 local invariant = require(script.Parent.Parent.invariant)
 
 local function hydrate(instanceMap, virtualInstances, rootId, rootInstance)
@@ -26,6 +29,17 @@ local function hydrate(instanceMap, virtualInstances, rootId, rootInstance)
 	for _, childId in ipairs(virtualInstance.Children) do
 		local virtualChild = virtualInstances[childId]
 
+		if virtualChild == nil then
+			Log.warn(
+				"Hydration: virtualInstances missing child ID {} (parent: {} '{}')",
+				childId,
+				rootId,
+				virtualInstance.Name
+			)
+			continue
+		end
+
+		local matched = false
 		for childIndex, childInstance in existingChildren do
 			if not isExistingChildVisited[childIndex] then
 				-- We guard accessing Name and ClassName in order to avoid
@@ -40,10 +54,33 @@ local function hydrate(instanceMap, virtualInstances, rootId, rootInstance)
 				if accessSuccess and name == virtualChild.Name and className == virtualChild.ClassName then
 					isExistingChildVisited[childIndex] = true
 					hydrate(instanceMap, virtualInstances, childId, childInstance)
+					matched = true
 					break
 				end
 			end
 		end
+
+		if not matched then
+			-- Log why the match failed to help diagnose hydration issues
+			Log.debug(
+				"Hydration: No match for virtual child '{}' ({}) under '{}' ({})",
+				virtualChild.Name,
+				virtualChild.ClassName,
+				virtualInstance.Name,
+				rootInstance:GetFullName()
+			)
+			-- List real children for comparison
+			local realChildNames = {}
+			for _, child in existingChildren do
+				local success, childName, childClass = pcall(function()
+					return child.Name, child.ClassName
+				end)
+				if success then
+					table.insert(realChildNames, string.format("%s (%s)", childName, childClass))
+				end
+			end
+			Log.trace("  Real children: {}", table.concat(realChildNames, ", "))
+		end
 	end
 end
 

plugin/src/Reconciler/reify.lua

@@ -2,6 +2,7 @@
 	"Reifies" a virtual DOM, constructing a real DOM with the same shape.
 ]]
 
+local invariant = require(script.Parent.Parent.invariant)
 local PatchSet = require(script.Parent.Parent.PatchSet)
 local setProperty = require(script.Parent.setProperty)
 local decodeValue = require(script.Parent.decodeValue)
@@ -31,6 +32,12 @@ function reifyInstance(deferredRefs, instanceMap, virtualInstances, rootId, pare
 	-- properties that could not be assigned.
 	local unappliedPatch = PatchSet.newEmpty()
 
+	-- The root ID must exist - if not, it's a programming error
+	local rootInstance = virtualInstances[rootId]
+	if rootInstance == nil then
+		invariant("Cannot reify an instance not present in virtualInstances\nID: {}", rootId)
+	end
+
 	reifyInstanceInner(unappliedPatch, deferredRefs, instanceMap, virtualInstances, rootId, parentInstance)
 
 	return unappliedPatch
@@ -43,10 +50,10 @@ function reifyInstanceInner(unappliedPatch, deferredRefs, instanceMap, virtualIn
 	local virtualInstance = virtualInstances[id]
 
 	if virtualInstance == nil then
-		-- This instance was intentionally excluded from the patch (e.g., due to
-		-- ambiguous paths with duplicate-named siblings). Skip it gracefully
-		-- rather than throwing an error. The parent's Children array may still
-		-- reference this ID even though it wasn't included in the additions.
+		-- This child was intentionally excluded from the patch (e.g., due to
+		-- ambiguous paths with duplicate-named siblings). Skip it gracefully.
+		-- The parent's Children array may still reference this ID even though
+		-- it wasn't included in the additions.
 		return
 	end