feat(app): sidebar reveal animation, hover peek overlay, and weaker dividers (#16374)

Co-authored-by: Adam <2363879+adamdotdevin@users.noreply.github.com>

packages/app/src/pages/layout/sidebar-shell.tsx

@@ -1,4 +1,4 @@
-import { createMemo, For, Show, type Accessor, type JSX } from "solid-js"
+import { createEffect, createMemo, For, Show, type Accessor, type JSX } from "solid-js"
 import {
   DragDropProvider,
   DragDropSensors,
@@ -35,10 +35,22 @@ export const SidebarContent = (props: {
 }): JSX.Element => {
   const expanded = createMemo(() => sidebarExpanded(props.mobile, props.opened()))
   const placement = () => (props.mobile ? "bottom" : "right")
+  let panel: HTMLDivElement | undefined
+
+  createEffect(() => {
+    const el = panel
+    if (!el) return
+    if (expanded()) {
+      el.removeAttribute("inert")
+      return
+    }
+    el.setAttribute("inert", "")
+  })
 
   return (
-    <div class="flex h-full w-full overflow-hidden">
+    <div class="flex h-full w-full min-w-0 overflow-hidden">
       <div
+        data-component="sidebar-rail"
         class="w-16 shrink-0 bg-background-base flex flex-col items-center overflow-hidden"
         onMouseMove={props.aimMove}
       >
@@ -100,7 +112,15 @@ export const SidebarContent = (props: {
         </div>
       </div>
 
-      <Show when={expanded()}>{props.renderPanel()}</Show>
+      <div
+        ref={(el) => {
+          panel = el
+        }}
+        classList={{ "flex h-full min-h-0 min-w-0 overflow-hidden": true, "pointer-events-none": !expanded() }}
+        aria-hidden={!expanded()}
+      >
+        {props.renderPanel()}
+      </div>
     </div>
   )
 }

packages/app/src/pages/layout/sidebar-workspace.tsx

@@ -249,7 +249,7 @@ const WorkspaceSessionList = (props: {
   loadMore: () => Promise<void>
   language: ReturnType<typeof useLanguage>
 }): JSX.Element => (
-  <nav class="flex flex-col gap-1 px-2">
+  <nav class="flex flex-col gap-1 px-3">
     <Show when={props.showNew()}>
       <NewSessionItem
         slug={props.slug()}
@@ -490,7 +490,7 @@ export const LocalWorkspace = (props: {
       ref={(el) => props.ctx.setScrollContainerRef(el, props.mobile)}
       class="size-full flex flex-col py-2 overflow-y-auto no-scrollbar [overflow-anchor:none]"
     >
-      <nav class="flex flex-col gap-1 px-2">
+      <nav class="flex flex-col gap-1 px-3">
         <Show when={loading()}>
           <SessionSkeleton />
         </Show>