diff --git a/src/components/Feed.tsx b/src/components/Feed.tsx
index af821c85..8fff7596 100644
--- a/src/components/Feed.tsx
+++ b/src/components/Feed.tsx
@@ -280,6 +280,9 @@ export function Feed({ kinds, tagFilters, header, hideCompose, emptyMessage, fee
         />
       )}
 
+      {/* Compose box and header render *after* the tab bar so that tabs stay
+          at the top as the primary navigation element on every feed page.
+          This is intentional — see commits 3e7edf65, 82fe6f2f. */}
       {!hideCompose && <ComposeBox compact />}
 
       {header}
diff --git a/src/components/MainLayout.tsx b/src/components/MainLayout.tsx
index 73957085..26ec016f 100644
--- a/src/components/MainLayout.tsx
+++ b/src/components/MainLayout.tsx
@@ -88,6 +88,12 @@ function MainLayoutInner() {
 
         {/* Main content + right sidebar: inside Suspense so the left sidebar persists while lazy pages load */}
         <Suspense fallback={<PageSkeleton />}>
+          {/* -mt-mobile-bar pulls content up behind the mobile top bar so the
+              transparent SVG header arc and page content overlap seamlessly.
+              The corresponding padding-top (set in CSS) prevents content from
+              being hidden. This depends on MobileTopBar having a transparent /
+              semi-transparent background — a solid top bar would obscure the
+              content underneath. Only active below the sidebar breakpoint. */}
           <div className={cn("relative flex-1 min-w-0 sidebar:border-l sidebar:border-r border-border bg-background/85 -mt-mobile-bar", !noMaxWidth && "sidebar:max-w-[600px]", !noOverscroll && "pb-overscroll")}>
             <Outlet />
             {showFAB && (
diff --git a/src/components/MobileDrawer.tsx b/src/components/MobileDrawer.tsx
index 842f5165..d167439e 100644
--- a/src/components/MobileDrawer.tsx
+++ b/src/components/MobileDrawer.tsx
@@ -1,4 +1,4 @@
-import { useState, useMemo } from 'react';
+import { useState, useId, useMemo } from 'react';
 import { useNavigate, useLocation } from 'react-router-dom';
 import { ChevronDown, ChevronUp, LogOut, UserPlus, Loader2 } from 'lucide-react';
 import { Avatar, AvatarImage, AvatarFallback } from '@/components/ui/avatar';
@@ -32,11 +32,10 @@ import { resolveTheme, resolveThemeConfig } from '@/themes';
 /** Total width of the drawer background layer: 300px drawer + 36px arc overhang. */
 const DRAWER_BG_WIDTH = 336;
 
-/** Shared clip-path style for the drawer arc background layers. */
-const drawerClipStyle: React.CSSProperties = {
-  width: DRAWER_BG_WIDTH,
-  clipPath: 'url(#drawer-arc-clip)',
-};
+/** Build the shared clip-path style for the drawer arc background layers. */
+function drawerClipStyle(clipId: string): React.CSSProperties {
+  return { width: DRAWER_BG_WIDTH, clipPath: `url(#${clipId})` };
+}
 
 interface MobileDrawerProps {
   open: boolean;
@@ -44,6 +43,8 @@ interface MobileDrawerProps {
 }
 
 export function MobileDrawer({ open, onOpenChange }: MobileDrawerProps) {
+  const clipId = `${useId()}-drawer-arc-clip`;
+  const clipStyle = drawerClipStyle(clipId);
   const location = useLocation();
   const navigate = useNavigate();
   const { user, metadata, event: currentUserEvent } = useCurrentUser();
@@ -115,7 +116,7 @@ export function MobileDrawer({ open, onOpenChange }: MobileDrawerProps) {
               drawer while the extra 36px overflows for the curved bulge. */}
           <svg className="absolute" width="0" height="0" aria-hidden="true">
             <defs>
-              <clipPath id="drawer-arc-clip" clipPathUnits="objectBoundingBox">
+              <clipPath id={clipId} clipPathUnits="objectBoundingBox">
                 <path d="M0,0 L0.893,0 Q1,0.5 0.893,1 L0,1 Z" />
               </clipPath>
             </defs>
@@ -125,12 +126,12 @@ export function MobileDrawer({ open, onOpenChange }: MobileDrawerProps) {
               seamlessly through both regions. */}
           <div
             className="absolute top-0 left-0 bottom-0 pointer-events-none bg-background"
-            style={{ ...bgStyle, ...drawerClipStyle }}
+            style={{ ...bgStyle, ...clipStyle }}
           />
           {hasBgImage && (
             <div
               className="absolute top-0 left-0 bottom-0 bg-background/70 pointer-events-none"
-              style={drawerClipStyle}
+              style={clipStyle}
             />
           )}
           <SheetTitle className="sr-only">Navigation menu</SheetTitle>
diff --git a/src/pages/AIChatPage.tsx b/src/pages/AIChatPage.tsx
index 5fc4f6b3..620ae414 100644
--- a/src/pages/AIChatPage.tsx
+++ b/src/pages/AIChatPage.tsx
@@ -419,43 +419,43 @@ export function AIChatPage() {
       <div className="shrink-0 px-4 py-3 flex flex-col sidebar:flex-row sidebar:items-center sidebar:justify-between gap-2 sidebar:gap-3">
         <PageHeader title="AI Chat" icon={<Bot className="size-5" />} className="px-0 mt-0 mb-0" />
 
-          <div className="flex items-center gap-2">
-            {/* Model selector */}
-            <Select value={selectedModel} onValueChange={setSelectedModel} disabled={modelsLoading}>
-              <SelectTrigger className="w-full sidebar:w-44 h-8 text-base md:text-xs">
-                <SelectValue placeholder={modelsLoading ? 'Loading models...' : 'Select model'} />
-              </SelectTrigger>
-              <SelectContent>
-                {models.map((model) => {
-                  const totalCost = parseFloat(model.pricing.prompt) + parseFloat(model.pricing.completion);
-                  const isFree = totalCost === 0;
-                  return (
-                    <SelectItem key={model.id} value={model.id}>
-                      <span className="flex items-center gap-1.5">
-                        {model.name}
-                        {isFree && (
-                          <span className="text-[10px] font-medium text-green-600 dark:text-green-400 bg-green-500/10 px-1 rounded">
-                            FREE
-                          </span>
-                        )}
-                      </span>
-                    </SelectItem>
-                  );
-                })}
-              </SelectContent>
-            </Select>
+        <div className="flex items-center gap-2">
+          {/* Model selector */}
+          <Select value={selectedModel} onValueChange={setSelectedModel} disabled={modelsLoading}>
+            <SelectTrigger className="w-full sidebar:w-44 h-8 text-base md:text-xs">
+              <SelectValue placeholder={modelsLoading ? 'Loading models...' : 'Select model'} />
+            </SelectTrigger>
+            <SelectContent>
+              {models.map((model) => {
+                const totalCost = parseFloat(model.pricing.prompt) + parseFloat(model.pricing.completion);
+                const isFree = totalCost === 0;
+                return (
+                  <SelectItem key={model.id} value={model.id}>
+                    <span className="flex items-center gap-1.5">
+                      {model.name}
+                      {isFree && (
+                        <span className="text-[10px] font-medium text-green-600 dark:text-green-400 bg-green-500/10 px-1 rounded">
+                          FREE
+                        </span>
+                      )}
+                    </span>
+                  </SelectItem>
+                );
+              })}
+            </SelectContent>
+          </Select>
 
-            <Button
-              variant="ghost"
-              size="icon"
-              className="size-8"
-              onClick={handleClear}
-              disabled={messages.length === 0}
-              title="Clear conversation"
-            >
-              <Trash2 className="size-4" />
-            </Button>
-          </div>
+          <Button
+            variant="ghost"
+            size="icon"
+            className="size-8"
+            onClick={handleClear}
+            disabled={messages.length === 0}
+            title="Clear conversation"
+          >
+            <Trash2 className="size-4" />
+          </Button>
+        </div>
       </div>
 
       {/* Messages Area */}