Merge branch 'main' into SaaS

frontend/editor/src/core/utils/fsAccessCapability.ts

@@ -0,0 +1,31 @@
+/**
+ * Feature detection for the File System Access API.
+ *
+ * Browser support matrix (as of 2026):
+ *   Chrome/Edge: full support — showDirectoryPicker, createWritable, queryPermission
+ *   Firefox:     showDirectoryPicker + read-only iteration only; no createWritable, no queryPermission
+ *   Safari 15.2+: showDirectoryPicker + read only; no createWritable
+ */
+
+/** True when the browser can pick a directory and read files from it. */
+export const canReadLocalFolder: boolean =
+  typeof window !== "undefined" &&
+  typeof (window as any).showDirectoryPicker === "function";
+
+/** True when the browser supports writing files (createWritable). Requires Chrome/Edge. */
+export const canWriteLocalFolder: boolean =
+  canReadLocalFolder &&
+  typeof FileSystemFileHandle !== "undefined" &&
+  typeof (FileSystemFileHandle.prototype as any).createWritable === "function";
+
+/** True when the browser supports permission querying across sessions (queryPermission). */
+export const canPersistFsPermission: boolean =
+  canReadLocalFolder &&
+  typeof FileSystemHandle !== "undefined" &&
+  typeof (FileSystemHandle.prototype as any).queryPermission === "function";
+
+export const FS_READ_UNSUPPORTED_MSG =
+  "Your browser does not support the File System Access API. Use Chrome or Edge.";
+
+export const FS_WRITE_UNSUPPORTED_MSG =
+  "Your browser cannot write to local folders. Use Chrome or Edge for this feature.";