feat(library): wire save-mode into the five custom-client tool submitters (#577)

Closes #565. Wires the fileId/saveMode pair into the ocr, erase-object, remove-background, background-replace, and blur-background submitters so the library save-mode selector works for them; remove-background's two-phase effects route now auto-saves the final composite instead of the transparent intermediate.

packages/shared/src/library-save.ts

@@ -2,16 +2,17 @@ import { BASE_CONFIG, CONVERSION_PRESETS } from "./conversion-presets.js";
 
 /**
  * Tools where the library save-mode choice (#495) does not work end to end,
- * so the selector must stay hidden: either the tool's hand-written route
- * ignores the multipart fileId/saveMode pair, or its settings component
- * submits through its own XHR without sending them. For these tools a
- * library-sourced edit is never auto-saved (the pre-#495 status quo).
+ * so the selector must stay hidden: the tool's hand-written route ignores the
+ * multipart fileId/saveMode pair, so a library-sourced edit is never
+ * auto-saved (the pre-#495 status quo).
  *
  * When wiring one of these up (parse fileId/saveMode in the route like
  * tool-factory.ts, append them in the client like sign-pdf-settings.tsx),
  * remove it from this set so the selector appears. The integration suite
  * pins the other direction: every tool NOT listed here returns 400 for an
- * invalid saveMode.
+ * invalid saveMode. (#565 wired the five custom-client submitters that had a
+ * ready route but a submitter that dropped the pair: ocr, erase-object,
+ * remove-background, background-replace, blur-background.)
  */
 export const LIBRARY_SAVE_MODE_UNSUPPORTED_TOOLS: ReadonlySet<string> = new Set([
   // Custom routes without fileId/saveMode handling
@@ -43,12 +44,6 @@ export const LIBRARY_SAVE_MODE_UNSUPPORTED_TOOLS: ReadonlySet<string> = new Set(
   "strip-metadata",
   "vectorize",
   "watermark-image",
-  // Routes accept saveMode but the custom client submitters do not send it yet
-  "ocr",
-  "remove-background",
-  "erase-object",
-  "background-replace",
-  "blur-background",
   // Conversion presets served by the custom image-to-pdf / pdf-to-image /
   // svg-to-raster routes (the registry group rides the factory and works)
   ...CONVERSION_PRESETS.filter((p) => BASE_CONFIG[p.base]?.group !== "registry").map((p) => p.id),