updates

docs/FRONTEND.md

@@ -39,7 +39,8 @@ read-only `SharePage` (no auth), everything else renders the authenticated app.
   share button), message list (`Markdown` for assistant, emerald bubble for
   user), rounded composer (Enter to send, Shift+Enter for newline).
 - `dialogs.tsx` — `ConvEditDialog` (title + topic), `ShareModal` (public link,
-  copy, unshare), `SettingsModal` (display name, avatar URL, theme).
+  copy, unshare), `SettingsModal` (display name, avatar upload box with
+  drag & drop, avatar URL, theme).
 - `AdminPanel.tsx` — No-KYC account management: create (key shown once),
   regenerate (revokes sessions), edit, delete with confirm.
 - `SharePage.tsx` — public read-only view, fetches `/api/share/:id` unauthenticated.
@@ -52,3 +53,12 @@ Tailwind `darkMode: "class"`. `applyTheme()` in `App.tsx` toggles the `dark`
 class from the account theme (`auto` follows `prefers-color-scheme` with a
 live media-query listener). Accent: emerald; shapes: `rounded-2xl/3xl`
 everywhere; every surface needs a `dark:` variant. UI text is English only.
+
+## Mobile
+
+Below the `md` breakpoint the sidebar becomes a slide-in drawer (backdrop tap
+or swipe-left closes it, hamburger in the chat header opens it). Modals render
+as bottom sheets with a drag handle — pull down past the threshold to dismiss
+(tap backdrop or Escape works too). Composer respects
+`env(safe-area-inset-bottom)`. No separate mobile codebase: same components,
+responsive Tailwind classes + minimal touch handlers.