fix: carry the owner's path into WebDAV events and expand tilde before touch

WebDAV emits the same GUI events the FS controllers do, and had the same
confusion: the payload was masked for the actor and addressed to the owner. A
recipient mounting a shared folder in Finder reproduced the disappearing-item
symptom exactly.

/touch prefixed `/` before expanding, so `~/AppData/<app>/f.txt` became a literal
`/~/...` that no longer looked like a tilde path — the shape puter.js sends for
every app-relative write answered 404.

src/backend/controllers/fs/LegacyFSController.ts

@@ -1050,11 +1050,12 @@ export class LegacyFSController extends PuterController {
                 legacyCode: 'bad_request',
             });
 
-        const targetPath = await expandClientPath(
+        const expanded = await expandClientPath(
             this.stores.fsEntry,
-            rawPath.startsWith('/') ? rawPath : `/${rawPath}`,
+            rawPath,
             actor.user?.username,
         );
+        const targetPath = expanded.startsWith('/') ? expanded : `/${expanded}`;
         const parentPath = pathPosix.dirname(targetPath);
         if (parentPath === '/') {
             throw new HttpError(400, 'Cannot touch in root', {

src/backend/controllers/fs/sharedFolderWrites.http.test.ts

@@ -138,6 +138,17 @@ describe('writes inside a folder shared with write', () => {
         expect(await ownerListing(s)).toContain('from-recipient.txt');
     }, 180_000);
 
+    it('touch still expands a tilde path', async () => {
+        const s = await shareAFolder();
+
+        const touched = await post('/touch', s.owner.token, {
+            path: '~/SharedDir/from-tilde.txt',
+        });
+
+        expect(touched.status).toBe(200);
+        expect(await ownerListing(s)).toContain('from-tilde.txt');
+    }, 180_000);
+
     // Addressed to the owner, so it carries the path the owner can resolve.
     it('publishes the owner’s real path on events about their entries', async () => {
         const s = await shareAFolder();

src/backend/controllers/webdav/WebDAVController.ts

@@ -1174,7 +1174,9 @@ export class WebDAVController extends PuterController {
         void Promise.resolve()
             .then(async () => {
                 const response = {
-                    ...(await toLegacyEntry(this.clients.event, entry)),
+                    ...(await toLegacyEntry(this.clients.event, entry, {
+                        forOwner: true,
+                    })),
                     ...extra,
                     from_new_service: true,
                 };