Give split-layout pages independent scroll regions

Chat and Settings escaped the content padding with a hardcoded
calc(100vh - 44px) height and negative margins, while Files and Social let the
whole page scroll, so secondary panes (channel list, settings nav, file tree)
scrolled away. Add a .content.flush modifier the Shell applies to the chat,
settings, files and social routes, plus a reusable .pane-scroll region, and
rework those pages to fill the content area with each pane scrolling on its
own. Removes the magic-number coupling to the topbar height.

AgentCompany-New/src/renderer/src/pages/ChatPage.tsx

@@ -196,7 +196,7 @@ export function ChatPage({ snapshot, actions }: PageProps) {
     }));
 
   return (
-    <div className="split-main" style={{ height: "calc(100vh - 44px)", margin: "-28px -32px -40px" }}>
+    <div className="split-main">
       <ChatSidebar
         channels={channels}
         directs={directs}

AgentCompany-New/src/renderer/src/pages/FilesPage.tsx

@@ -46,7 +46,7 @@ export function FilesPage({ snapshot, actions }: PageProps) {
   const totalBytes = visibleFiles.reduce((sum, file) => sum + file.sizeBytes, 0);
 
   return (
-    <div style={{ display: "grid", gridTemplateColumns: "minmax(160px, 200px) minmax(0, 1fr)", gap: 24 }}>
+    <div style={{ display: "grid", gridTemplateColumns: "minmax(160px, 200px) minmax(0, 1fr)", gap: 24, height: "100%", minHeight: 0, padding: "28px 32px 0" }}>
       <FilesTree
         files={files}
         pinnedFiles={pinnedFiles}
@@ -56,7 +56,7 @@ export function FilesPage({ snapshot, actions }: PageProps) {
         onChange={setSection}
       />
 
-      <div style={{ minWidth: 0 }}>
+      <div style={{ minWidth: 0, display: "flex", flexDirection: "column", minHeight: 0 }}>
         <TopbarActions>
           <Button tone="ghost"><Icon name="filter" size={13} /></Button>
           <Segmented<ViewMode>
@@ -76,6 +76,7 @@ export function FilesPage({ snapshot, actions }: PageProps) {
           {visibleFiles.length} {visibleFiles.length === 1 ? "file" : "files"} · {formatBytes(totalBytes)}
         </p>
 
+        <div className="pane-scroll" style={{ paddingBottom: 40 }}>
         {pinnedFiles.length > 0 && section.kind === "all" && (
           <>
             <div className="section-label" style={{ marginBottom: 10 }}>Pinned</div>
@@ -115,6 +116,7 @@ export function FilesPage({ snapshot, actions }: PageProps) {
             onTogglePin={(file) => void actions.run(() => window.agentCompany.setFilePinned({ orgId, fileId: file.id, pinned: !file.pinned }))}
           />
         )}
+        </div>
       </div>
     </div>
   );
@@ -137,7 +139,7 @@ function FilesTree({
 }) {
   const recent = files.filter((file) => isRecent(file.createdAt));
   return (
-    <aside>
+    <aside style={{ overflowY: "auto", minHeight: 0, paddingBottom: 40 }}>
       <div className="section-label">Library</div>
       <TreeItem
         icon="folder"

AgentCompany-New/src/renderer/src/pages/SettingsPage.tsx

@@ -110,14 +110,16 @@ export function SettingsPage({ snapshot, actions }: PageProps) {
   const rollbackSnapshots = useMemo(() => snapshot.rollbackSnapshots.filter((item) => item.orgId === orgId), [snapshot.rollbackSnapshots, orgId]);
 
   return (
-    <div className="split-main" style={{ height: "calc(100vh - 44px)", margin: "-28px -32px -40px" }}>
+    <div className="split-main">
       <aside className="secondary-pane">
         <div style={{ fontSize: 13, fontWeight: 600, padding: "4px 8px 14px" }}>Settings</div>
-        <NavGroup items={WORKSPACE_GROUP} active={tab} onChange={setTab} />
-        <NavGroupLabel>Agents</NavGroupLabel>
-        <NavGroup items={AGENTS_GROUP} active={tab} onChange={setTab} />
-        <NavGroupLabel>Account</NavGroupLabel>
-        <NavGroup items={ACCOUNT_GROUP} active={tab} onChange={setTab} />
+        <div className="pane-scroll">
+          <NavGroup items={WORKSPACE_GROUP} active={tab} onChange={setTab} />
+          <NavGroupLabel>Agents</NavGroupLabel>
+          <NavGroup items={AGENTS_GROUP} active={tab} onChange={setTab} />
+          <NavGroupLabel>Account</NavGroupLabel>
+          <NavGroup items={ACCOUNT_GROUP} active={tab} onChange={setTab} />
+        </div>
       </aside>
       <div className="main" style={{ flex: 1, minWidth: 0 }}>
         <div className="content">

AgentCompany-New/src/renderer/src/pages/SocialPage.tsx

@@ -76,7 +76,7 @@ export function SocialPage({ snapshot, actions }: PageProps) {
     void actions.run(() => window.agentCompany.setScheduledPostState({ orgId, scheduledPostId: post.id, state, employeeId: employee.id }));
 
   return (
-    <div className="page">
+    <div className="page" style={{ display: "flex", flexDirection: "column", minHeight: 0, height: "100%", padding: "28px 32px 0" }}>
       <TopbarActions>
         <Button onClick={() => setConnectOpen(true)}><Icon name="plus" size={13} /> Connect account</Button>
         <Button tone="primary" onClick={() => setDraftOpen(true)} disabled={accounts.length === 0}>
@@ -89,6 +89,7 @@ export function SocialPage({ snapshot, actions }: PageProps) {
         {operatorName ? ` · managed by ${operatorName}` : ""}
       </p>
 
+      <div className="pane-scroll" style={{ paddingBottom: 40 }}>
       {accounts.length > 0 && (
         <>
           <div className="section-label" style={{ marginBottom: 10 }}>Accounts</div>
@@ -148,6 +149,7 @@ export function SocialPage({ snapshot, actions }: PageProps) {
 
         <SocialCalendar posts={scheduledPosts} accounts={accounts} />
       </div>
+      </div>
 
       <Dialog title="Connect social account" open={connectOpen} submitLabel="Connect" onClose={() => setConnectOpen(false)} onSubmit={connect}>
         <Field label="Platform">

AgentCompany-New/src/renderer/src/pages/chat/ChatSidebar.tsx

@@ -26,33 +26,35 @@ export function ChatSidebar({
         <div style={{ fontSize: 13, fontWeight: 600 }}>Messages</div>
         <IconButton icon="plus" label="New space" onClick={onCreateSpace} />
       </div>
-      <NavGroup label="Channels">
-        {channels.length === 0 ? (
-          <Empty>No channels.</Empty>
-        ) : channels.map((space) => (
-          <ChannelItem
-            key={space.id}
-            space={space}
-            active={space.id === activeSpaceId}
-            count={countMessagesIn(space.id, messages)}
-            onClick={() => onSelect(space.id)}
-          />
-        ))}
-      </NavGroup>
-      {directs.length > 0 && (
-        <NavGroup label="Direct">
-          {directs.map((space) => (
-            <DirectItem
+      <div className="pane-scroll">
+        <NavGroup label="Channels">
+          {channels.length === 0 ? (
+            <Empty>No channels.</Empty>
+          ) : channels.map((space) => (
+            <ChannelItem
               key={space.id}
               space={space}
-              agents={agents}
               active={space.id === activeSpaceId}
               count={countMessagesIn(space.id, messages)}
               onClick={() => onSelect(space.id)}
             />
           ))}
         </NavGroup>
-      )}
+        {directs.length > 0 && (
+          <NavGroup label="Direct">
+            {directs.map((space) => (
+              <DirectItem
+                key={space.id}
+                space={space}
+                agents={agents}
+                active={space.id === activeSpaceId}
+                count={countMessagesIn(space.id, messages)}
+                onClick={() => onSelect(space.id)}
+              />
+            ))}
+          </NavGroup>
+        )}
+      </div>
     </aside>
   );
 }

AgentCompany-New/src/renderer/src/shared/Shell.tsx

@@ -22,6 +22,10 @@ interface NavSpec {
   icon: IconName;
 }
 
+/** Routes whose pages own a full-height, multi-pane layout with their own
+ * internal scroll regions, so the content area must not scroll as one block. */
+const FLUSH_ROUTES = new Set<RouteId>(["chat", "settings", "files", "social"]);
+
 const primaryNav: NavSpec[] = [
   { id: "home", label: "Home", icon: "home" },
   { id: "team", label: "Team", icon: "team" },
@@ -132,7 +136,7 @@ export function Shell({
             )}
           </div>
         </header>
-        <div className="content">
+        <div className={FLUSH_ROUTES.has(route) ? "content flush" : "content"}>
           <TopbarSlotContext.Provider value={actionsSlot}>{children}</TopbarSlotContext.Provider>
         </div>
       </main>

AgentCompany-New/src/renderer/src/styles.css

@@ -298,6 +298,19 @@ a { color: inherit; }
   overflow: auto;
   padding: 28px 32px 40px;
 }
+/* Split-layout routes fill the content area and let their panes scroll
+   independently instead of scrolling the whole page. */
+.content.flush {
+  display: flex;
+  flex-direction: column;
+  overflow: hidden;
+  padding: 0;
+}
+.pane-scroll {
+  flex: 1;
+  min-height: 0;
+  overflow-y: auto;
+}
 .page { max-width: 1100px; }
 .page-wide { width: 100%; }
 .page-h1 {