Enhance git metadata handling and improve change detection logic

- Introduced a new function `getGitMetadata` in `ApiContext` to fetch current git metadata, including new file IDs.
- Updated the `PatchTree.build` function to handle new file IDs, allowing for better differentiation between tracked and untracked files during patch processing.
- Modified the `git_changed_files` function to return both tracked and untracked files, improving accuracy in change detection.
- Enhanced the `App` component to debounce git metadata refreshes, ensuring the UI reflects the latest changes without unnecessary calls.

These changes aim to improve the integration with git and enhance the accuracy of change detection in the application.

plugin/src/PatchTree.lua

@@ -250,7 +250,7 @@ local PatchTree = {}
 
 -- Builds a new tree from a patch and instanceMap
 -- uses changeListHeaders in node.changeList
--- gitMetadata is optional: { changedIds: {string}, scriptCommittedHashes: {[string]: {string}} }
+-- gitMetadata is optional: { changedIds: {string}, scriptCommittedHashes: {[string]: {string}}, newFileIds: {string}? }
 function PatchTree.build(patch, instanceMap, changeListHeaders, gitMetadata)
 	Timer.start("PatchTree.build")
 	local clock = os.clock()
@@ -267,6 +267,14 @@ function PatchTree.build(patch, instanceMap, changeListHeaders, gitMetadata)
 		end
 	end
 
+	local newFileIdSet = nil
+	if gitMetadata and gitMetadata.newFileIds then
+		newFileIdSet = {}
+		for _, id in gitMetadata.newFileIds do
+			newFileIdSet[id] = true
+		end
+	end
+
 	Timer.start("patch.updated")
 	for _, change in patch.updated do
 		clock = yieldIfNeeded(clock)
@@ -518,8 +526,14 @@ function PatchTree.build(patch, instanceMap, changeListHeaders, gitMetadata)
 			table.insert(changeList, 1, changeListHeaders)
 		end
 
-		-- Add this node to tree
-		-- Default to nil (unselected) - user must explicitly choose Push/Pull/Skip
+		-- Truly new files (untracked in git) default to "push" (Atlas).
+		-- Tracked files appearing as additions are ambiguous (Studio may have
+		-- deleted them), so they remain nil for user review.
+		local defaultSelection = nil
+		if newFileIdSet and newFileIdSet[id] then
+			defaultSelection = "push"
+		end
+
 		tree:addNode(change.Parent, {
 			id = change.Id,
 			patchType = "Add",
@@ -528,7 +542,7 @@ function PatchTree.build(patch, instanceMap, changeListHeaders, gitMetadata)
 			changeInfo = changeInfo,
 			changeList = changeList,
 			instance = instanceMap.fromIds[id],
-			defaultSelection = nil,
+			defaultSelection = defaultSelection,
 		})
 	end
 	Timer.stop()