Rename to miniSCP; migrate legacy data dirs on boot

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/bun/transfers/engine.ts

@@ -1,11 +1,14 @@
 import { pipeline } from "node:stream/promises";
 import type { Readable } from "node:stream";
+import { BRANDING } from "../../shared/branding";
 import type { EntryType, TransferSnapshot, TransferState } from "../../shared/types";
 import type { FileSystemProvider } from "../fs/provider";
 import type { SessionRegistry } from "../fs/registry";
 import { walkTree } from "./walk";
 
 const PROGRESS_INTERVAL_MS = 100;
+// same-fs probe temp files stay attributable to the app that wrote them
+const PROBE_PREFIX = `.${BRANDING.appName.toLowerCase()}-probe-`;
 // workers per job; the shared slot budget is the real limit
 const MAX_WORKERS_PER_JOB = 8;
 
@@ -359,7 +362,8 @@ export class TransferEngine {
 		dir: string,
 	): Promise<boolean> {
 		const token = crypto.randomUUID();
-		const probePath = dst.join(dir, `.bunscp-probe-${token.slice(0, 8)}`);
+		const probeName = `${PROBE_PREFIX}${token.slice(0, 8)}`;
+		const probePath = dst.join(dir, probeName);
 		try {
 			await new Promise<void>((resolve, reject) => {
 				const stream = dst.createWriteStream(probePath);
@@ -368,7 +372,7 @@ export class TransferEngine {
 			});
 			try {
 				const chunks: Buffer[] = [];
-				for await (const chunk of src.createReadStream(src.join(dir, `.bunscp-probe-${token.slice(0, 8)}`))) {
+				for await (const chunk of src.createReadStream(src.join(dir, probeName))) {
 					chunks.push(typeof chunk === "string" ? Buffer.from(chunk) : chunk);
 				}
 				const seen = Buffer.concat(chunks).toString("utf8") === token;