Address mobile-shell review: logout retry, public-garden bar, class hygiene

Gadfly findings on #98:

- Logout failure (4 models): the catch called setOpen(false), closing the
  popover and hiding the only "Retry sign out" affordance — contradicting
  its own comment. Keep the popover open on failure so the retry button
  (driven by logout.isError) stays on screen.
- Public garden (2 models): the bottom-bar suppression missed /g/$token,
  whose PublicGardenPage also renders a 100dvh-8rem canvas — a signed-in
  viewer of a shared link got the bar overlapping it. Suppress there too.
- BottomNav base className carried text-muted, fighting the active
  text-accent-strong and violating the file's own "color only in state
  props" convention (3 models). Moved color entirely to the state props.
- BottomNav sections prop type was a hand-written partial copy of the
  sections shape; derive `Section = (typeof sections)[number]` (2 models).
- Popover open state now resets on route change, so navigating (bottom nav
  or browser back) can't strand an invisible full-screen backdrop.
- Coupled the <main> bottom clearance to BottomNav's height (both 3.5rem /
  h-14, co-located with a note) and switched the template-string className
  to cn().

Verified live: route-change closes the popover with no lingering backdrop.

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>
Claude-Session: https://claude.ai/code/session_01H3zbym8Doka2d7D48maSgZ

web/src/components/layout/AppShell.tsx

@@ -1,7 +1,8 @@
-import { useState } from 'react'
-import { Link, Outlet, useMatchRoute, useNavigate } from '@tanstack/react-router'
+import { useEffect, useState } from 'react'
+import { Link, Outlet, useMatchRoute, useNavigate, useRouterState } from '@tanstack/react-router'
 import { Toaster } from '@/components/ui/toast'
 import { useLogout, useMe } from '@/lib/auth'
+import { cn } from '@/lib/cn'
 
 // Top-level sections. `icon` is only used by the mobile bottom bar; the desktop
 // top bar shows labels alone. Settings is filtered to admins at render.
@@ -11,6 +12,8 @@ const sections = [
   { to: '/settings', label: 'Settings', icon: '⚙️', adminOnly: true },
 ] as const
 
+type Section = (typeof sections)[number]
+
 // TanStack Router concatenates the base className with activeProps/inactiveProps,
 // so state-specific and conflicting utilities (text-muted vs text-fg) live in the
 // state props — never in the base — to avoid ambiguous overrides.
@@ -30,10 +33,13 @@ export function AppShell() {
   const user = me.data
   const matchRoute = useMatchRoute()
 
-  // The garden editor route ('/gardens/$gardenId') runs full-screen. Fuzzy:false
-  // so the '/gardens' list itself still shows the bottom bar.
+  // Full-screen canvas contexts own the bottom of the screen: the garden editor
+  // and the public shared-garden view both render a 100dvh-8rem canvas, so a
+  // signed-in viewer must not get the app bottom bar overlapping it. Fuzzy:false
+  // so the '/gardens' list itself still shows the bar.
   const inEditor = !!matchRoute({ to: '/gardens/$gardenId', fuzzy: false })
-  const showBottomNav = !!user && !inEditor
+  const inPublicGarden = !!matchRoute({ to: '/g/$token', fuzzy: false })
+  const showBottomNav = !!user && !inEditor && !inPublicGarden
 
   const visibleSections = sections.filter((s) => !s.adminOnly || user?.isAdmin)
 
@@ -79,11 +85,13 @@ export function AppShell() {
         </nav>
       </header>
 
-      {/* Bottom bar clearance on mobile so content isn't hidden behind it. */}
       <main
-        className={`mx-auto w-full max-w-5xl flex-1 px-4 py-6 ${
-          showBottomNav ? 'pb-[calc(4.5rem+env(safe-area-inset-bottom))] md:pb-6' : ''
-        }`}
+        className={cn(
+          'mx-auto w-full max-w-5xl flex-1 px-4 py-6',
+          // Clear the fixed bottom bar on mobile so content isn't hidden behind
+          // it. The 3.5rem must match BottomNav's h-14 (kept adjacent below).
+          showBottomNav && 'pb-[calc(3.5rem+env(safe-area-inset-bottom))] md:pb-6',
+        )}
       >
         <Outlet />
       </main>
@@ -101,16 +109,21 @@ function AccountMenu({ displayName }: { displayName: string }) {
   const logout = useLogout()
   const navigate = useNavigate()
   const [open, setOpen] = useState(false)
+  const pathname = useRouterState({ select: (s) => s.location.pathname })
+
+  // Close on any route change, so navigating (bottom nav, browser back) can't
+  // leave the popover — and its full-screen backdrop — stuck open over the page.
+  useEffect(() => setOpen(false), [pathname])
 
   async function onLogout() {
     try {
       await logout.mutateAsync()
       await navigate({ to: '/login' })
     } catch {
-      // The logout request failed, so the session is still valid server-side:
-      // leave the user where they are (the button re-enables for a retry) rather
-      // than pretending they're signed out. logout.isError drives the label.
-      setOpen(false)
+      // The logout request failed, so the session is still valid server-side.
+      // Keep the popover OPEN so the button (now "Retry sign out", driven by
+      // logout.isError) stays on screen — closing it would hide the only retry
+      // affordance and pretend nothing went wrong.
     }
   }
 
@@ -169,11 +182,7 @@ function AccountMenu({ displayName }: { displayName: string }) {
 }
 
 /** Mobile bottom tab bar for the top-level sections (thumb zone, safe-area aware). */
-function BottomNav({
-  sections,
-}: {
-  sections: ReadonlyArray<{ to: string; label: string; icon: string }>
-}) {
+function BottomNav({ sections }: { sections: ReadonlyArray<Section> }) {
   return (
     <nav
       aria-label="Sections"
@@ -182,9 +191,12 @@ function BottomNav({
       <ul className="mx-auto flex max-w-5xl items-stretch justify-around">
         {sections.map((s) => (
           <li key={s.to} className="flex-1">
+            {/* h-14 matches the clearance reserved on <main> above. Color lives
+                only in the state props (per the top-bar convention), never the
+                base, so active/inactive don't fight. */}
             <Link
               to={s.to}
-              className="flex min-h-[3.25rem] flex-col items-center justify-center gap-0.5 py-1.5 text-xs font-medium text-muted transition-colors"
+              className="flex h-14 flex-col items-center justify-center gap-0.5 text-xs font-medium transition-colors"
               activeProps={{ className: 'text-accent-strong' }}
               inactiveProps={{ className: 'text-muted hover:text-fg' }}
             >