feat(web): mobile dashboard UX polish (#28127)

* feat(web): mobile dashboard UX polish

Bottom sheets for sidebar theme/language pickers on narrow viewports with
enter/exit animation and drag-to-close; inline header badges beside titles;
bottom padding on the route outlet for scroll clearance; profiles loading uses a
unicode braille spinner; align profile/cron card actions to the top; viewport-fit
cover and supporting layout tweaks across dashboard pages.

Co-authored-by: Cursor <cursoragent@cursor.com>

* Fix Nix web npm hash and mobile sheet accessibility.

Align fetchNpmDeps in nix/web.nix with web/package-lock.json for CI. Improve BottomPickSheet backdrop labeling, avoid aria-hidden on the dialog during exit animation, and wire theme/language sheets with listbox semantics and localized dismiss labels.

Co-authored-by: Cursor <cursoragent@cursor.com>

---------

Co-authored-by: Cursor <cursoragent@cursor.com>

web/src/pages/EnvPage.tsx

@@ -537,13 +537,16 @@ export default function EnvPage() {
       document.getElementById(id)?.scrollIntoView({ behavior: "smooth", block: "start" });
     };
     setAfterTitle(
-      <nav className="flex items-center gap-1" aria-label="Jump to section">
+      <nav
+        className="flex shrink-0 flex-nowrap items-center gap-1"
+        aria-label="Jump to section"
+      >
         {sections.map((s) => (
           <button
             key={s.id}
             type="button"
             onClick={() => scrollTo(s.id)}
-            className="cursor-pointer px-2 py-0.5 text-[10px] uppercase tracking-wider text-muted-foreground hover:text-foreground border border-border/50 hover:border-foreground/30 transition-colors"
+            className="shrink-0 cursor-pointer px-2 py-0.5 text-[10px] uppercase tracking-wider text-muted-foreground hover:text-foreground border border-border/50 hover:border-foreground/30 transition-colors"
           >
             {s.label}
           </button>