fix: v2.5.3 — Windows workspace folders, picker on top, no console flashes

A workspace could not be created on Windows: "cwd must be an absolute path"
for D:\…, because createLane/canonicalCwd tested for a leading "/".

- lanes.js: path.isAbsolute/path.resolve; canonicalCwd stops at any root (a
  missing drive looped forever); resolveLaneByCwd and /ensure accept "\" too
- native-dialog.js: the Windows picker gets an invisible TopMost owner form,
  shown first — an ownerless dialog from the background server opened behind
  the browser, or hidden
- windows-hide.js: every child process on Windows starts with windowsHide,
  required first by the server and the detached scripts (a console window
  flashed per git/npm call)
- Confirm/update/clear-data modals and the quota panel scroll instead of
  overflowing a short window

client/src/pages/Settings.tsx

@@ -1229,7 +1229,7 @@ function ClearDataDialog({
         aria-modal="true"
         aria-labelledby="clear-data-title"
         aria-describedby="clear-data-body"
-        className="card w-full max-w-md space-y-4 border-status-danger/40 p-5"
+        className="card max-h-full w-full max-w-md space-y-4 overflow-y-auto border-status-danger/40 p-5"
         onClick={(e) => e.stopPropagation()}
       >
         <h2

client/src/pages/__tests__/__snapshots__/screens.snapshot.test.tsx.snap

@@ -7233,7 +7233,7 @@ exports[`screen snapshots > Settings — about 1`] = `
             <p
               class="text-[10px] text-status-warning/90 mt-1"
             >
-              UI build v2.5.2 (rebuild client to match)
+              UI build v2.5.3 (rebuild client to match)
             </p>
           </div>
           <div