feat(files): New → Clone repository clones into the open folder

The File Explorer's New menu (and its right-click menu) gains Clone
repository: it clones a URL into the folder it has open — of the user's own
home or of a workspace's own folder — through POST /api/lanes/clone with
that folder as `parent`, so the URL allowlist, the own-folder check and the
folder account's own git identity all apply, and opens a workspace on the
clone. ECREDENTIALS asks for a login, ESSHAUTH points to Settings → Git.
GET /api/homes now gives `me` its absolute `dir`. Keys typed in the dialog
never reach the explorer's shortcuts (Backspace / Delete).

client/src/components/lanes/FileExplorer.tsx

@@ -91,6 +91,7 @@ import { confirmDialog } from "../../lib/confirm";
 import { formatBytes } from "../../lib/format";
 import { copyText } from "../../lib/clipboard";
 import { ContextMenu, MenuItem, MenuSeparator, useContextMenu } from "../ContextMenu";
+import { CloneHereDialog } from "./CloneHereDialog";
 
 /** One upload batch at most (the server caps one file the same). */
 export const FX_BATCH_MAX_BYTES = 500 * 1024 * 1024;
@@ -268,6 +269,7 @@ export function FileBrowser({
   const [busy, setBusy] = useState(false);
   const [renaming, setRenaming] = useState<{ path: string; value: string } | null>(null);
   const [creating, setCreating] = useState<{ kind: "dir" | "file"; value: string } | null>(null);
+  const [cloning, setCloning] = useState(false);
   const [ask, setAsk] = useState<Ask | null>(null);
   const [askAll, setAskAll] = useState(false);
   const [progress, setProgress] = useState<{
@@ -314,6 +316,18 @@ export function FileBrowser({
   }, []);
   // Another user's home (an admin's view) is read-only.
   const ro = isHomePlace(target) && !!homes.find((h) => h.id === target.home)?.readOnly;
+  // Clone into the open folder: the absolute path of a workspace's own folder
+  // or of the user's own home (never a session worktree, an extra folder or
+  // another user's home); the server checks the folder again.
+  const cloneRoot = isHomePlace(target)
+    ? target.home === "me"
+      ? (homes.find((h) => h.id === "me")?.dir ?? null)
+      : null
+    : typeof target === "number"
+      ? (lanes.find((l) => l.id === target)?.cwd ?? null)
+      : null;
+  const cloneParent =
+    cloneRoot && view === "files" ? (path ? `${cloneRoot.replace(/\/+$/, "")}/${path}` : cloneRoot) : null;
 
   /** Go to `p` in workspace `tgt`, remembering where we were for Back. */
   const go = (p: string, tgt: FsPlace = target) => {
@@ -633,7 +647,7 @@ export function FileBrowser({
     writePref(VIEW_KEY, l);
   };
   const onKey = (e: ReactKeyboardEvent) => {
-    if (renaming || creating || ask) return;
+    if (renaming || creating || ask || cloning) return;
     const mod = e.ctrlKey || e.metaKey;
     const k = e.key.toLowerCase();
     // Another user's home is read-only: no key that writes.
@@ -784,6 +798,19 @@ export function FileBrowser({
       onClick={() => setMenu(null)}
       data-testid="file-explorer"
     >
+      {cloneParent && (
+        <CloneHereDialog
+          open={cloning}
+          parent={cloneParent}
+          onClose={() => setCloning(false)}
+          onCloned={(lane, at) => {
+            setCloning(false);
+            toast.success(t("fx.cloned", { path: at, workspace: lane.title || lane.cwd }));
+            setLanes((ls) => (ls.some((l) => l.id === lane.id) ? ls : [...ls, lane]));
+            changed();
+          }}
+        />
+      )}
       {/* ── Places ── */}
       <aside className="hidden w-52 shrink-0 flex-col border-r border-border bg-surface-0 sm:flex">
         <nav className="min-h-0 flex-1 overflow-y-auto px-2 pb-2" aria-label={t("fx.places")}>
@@ -1018,6 +1045,17 @@ export function FileBrowser({
                     >
                       {t("fx.newFile")}
                     </DropItem>
+                    {cloneParent && (
+                      <DropItem
+                        icon={<FolderGit2 className="h-4 w-4" />}
+                        onClick={() => {
+                          setMenu(null);
+                          setCloning(true);
+                        }}
+                      >
+                        {t("fx.cloneRepo")}
+                      </DropItem>
+                    )}
                   </DropButton>
                   <DropButton
                     label={t("fx.upload")}
@@ -1449,6 +1487,9 @@ export function FileBrowser({
                     {t("fx.newFolder")}
                   </MenuItem>
                   <MenuItem onSelect={close(() => startCreate("file"))}>{t("fx.newFile")}</MenuItem>
+                  {cloneParent && (
+                    <MenuItem onSelect={close(() => setCloning(true))}>{t("fx.cloneRepo")}</MenuItem>
+                  )}
                   <MenuSeparator />
                   <MenuItem onSelect={close(() => fileInput.current?.click())}>
                     {t("fx.uploadFiles")}