feat(desktop): open attachments in active project (#31192)

packages/app/src/context/platform.tsx

@@ -8,7 +8,13 @@ import type { UpdaterPlatform } from "../updater"
 
 type PickerPaths = string | string[] | null
 type OpenDirectoryPickerOptions = { title?: string; multiple?: boolean }
-type OpenFilePickerOptions = { title?: string; multiple?: boolean; accept?: string[]; extensions?: string[] }
+type OpenAttachmentPickerOptions = {
+  title?: string
+  multiple?: boolean
+  accept?: string[]
+  extensions?: string[]
+  defaultPath?: string
+}
 type SaveFilePickerOptions = { title?: string; defaultPath?: string }
 type PlatformName = "web" | "desktop"
 type DesktopOS = "macos" | "windows" | "linux"
@@ -21,13 +27,7 @@ export type FatalRendererErrorLog = {
   os?: DesktopOS
 }
 
-export type Platform = {
-  /** Platform discriminator */
-  platform: PlatformName
-
-  /** Desktop OS (Tauri only) */
-  os?: DesktopOS
-
+type PlatformBase = {
   /** App version */
   version?: string
 
@@ -49,13 +49,10 @@ export type Platform = {
   /** Send a system notification (optional deep link) */
   notify(title: string, description?: string, href?: string): Promise<void>
 
-  /** Open directory picker dialog (native on Tauri, server-backed on web) */
-  openDirectoryPickerDialog?(opts?: OpenDirectoryPickerOptions): Promise<PickerPaths>
+  /** Open a native attachment picker and read selected files sequentially (desktop only) */
+  openAttachmentPickerDialog?(opts: OpenAttachmentPickerOptions, onFile: (file: File) => Promise<unknown>): Promise<void>
 
-  /** Open native file picker dialog (Tauri only) */
-  openFilePickerDialog?(opts?: OpenFilePickerOptions): Promise<PickerPaths>
-
-  /** Save file picker dialog (Tauri only) */
+  /** Open a native save file picker dialog (desktop only) */
   saveFilePickerDialog?(opts?: SaveFilePickerOptions): Promise<string | null>
 
   /** Storage mechanism, defaults to localStorage */
@@ -110,6 +107,16 @@ export type Platform = {
   recordFatalRendererError?(error: FatalRendererErrorLog): Promise<void>
 }
 
+export type Platform = PlatformBase &
+  (
+    | { platform: "web"; os?: never }
+    | {
+        platform: "desktop"
+        os?: DesktopOS
+        openDirectoryPickerDialog(opts?: OpenDirectoryPickerOptions): Promise<PickerPaths>
+      }
+  )
+
 export type DisplayBackend = "auto" | "wayland"
 
 export const { use: usePlatform, provider: PlatformProvider } = createSimpleContext({