Add live syncback functionality and optimize service encoding

- Introduced a new endpoint `/api/syncback` for one-click full sync from Roblox Studio to the filesystem, eliminating the need for an active WebSocket connection.
- Implemented `SyncbackRequest` and `ServiceChunk` structures to handle service-level properties and child instances during syncback.
- Enhanced `encodeService` to include ObjectValue carriers for accurate reference handling and prevent data loss.
- Updated the syncback process to utilize Luau-style relative paths for reference attributes, improving path management and consistency.
- Integrated session caching in the matching algorithm to optimize performance during syncback operations.

These changes significantly improve the live syncback experience, ensuring reliable data synchronization and enhanced performance during development.

.cursor/rules/roblox/en-us/studio/ui-overview.md

@@ -83,10 +83,6 @@ You can customize the appearance of the toolbar by right-clicking in an empty ar
 
 Beyond the default tool tabs, you can add **custom tabs** for your specific needs, either through Studio's interface or by editing local `.json` files.
 
-<Alert severity="info">
-The tab configuration system is intended for customizing the Studio toolbar using existing controls/widgets and plugins. It's not meant to replace Studio [plugins](./plugins.md) or interactive [widgets](./build-studio-widgets.md).
-</Alert>
-
 <Tabs>
 <TabItem label="Studio">
 The easiest way to create custom tabs is through Studio's workflow.
@@ -116,12 +112,14 @@ The easiest way to create custom tabs is through Studio's workflow.
 
 Custom tab configurations are saved **locally** on each machine in `.json` format, allowing you to build customized tabs and share them with your team or the community.
 
-1. Open the custom tabs folder which is stored in a location unaffected by Studio updates.
+1. <Chip label="OPTIONAL" size="small" variant="outlined" /> To modify `.json` from a default tab toolset, begin by right‑clicking an existing tab and selecting **Duplicate&nbsp;tab**.
+
+2. Open the custom tabs folder which is stored in a location unaffected by Studio updates.
 
    - **Windows** — `%LOCALAPPDATA%\Roblox\<userID>\CustomRibbonTabs`
    - **Mac** — `~/Documents/Roblox/<userID>/CustomRibbonTabs`
 
-2. In the `CustomRibbonTabs` directory are `.json` files which define the toolbar's structure:
+3. In the `CustomRibbonTabs` directory are `.json` files which define the toolbar's structure:
 
    - The `RibbonLayout.json` file controls the overall ordering and visibility of tabs.
 
@@ -149,7 +147,7 @@ Custom tab configurations are saved **locally** on each machine in `.json` forma
 		}
 		```
 
-3. In the `Controls` array for a tab file, insert various buttons, submenus, and more. Each control's `Id` value must be **unique** within the file.
+4. In the `Controls` array for a tab file, insert various buttons, submenus, and more. Each control's `Id` value must be **unique** within the file.
 
    The following examples illustrate common elements in a custom tab:
 
@@ -297,7 +295,7 @@ Custom tab configurations are saved **locally** on each machine in `.json` forma
 	Beyond the above examples, you can right-click any default tab and select **Duplicate&nbsp;tab**. This will create a new custom tab and corresponding `.json` file in your local `CustomRibbonTabs` directory which you can inspect to explore how various default tools and menus are constructed.
 	</Alert>
 
-4. Save the `.json` file and then reload Studio's plugins:
+5. Save the `.json` file and then reload Studio's plugins:
 
    1. Right-click anywhere in the toolbar or mezzanine and select **Manage&nbsp;tabs**.
    2. Access the options menu from the popup's upper‑right corner and select **Reload&nbsp;custom&nbsp;tabs**.