Keep collapsed session header height (#5634)

Keep the session outer header at h-12 when the left sidebar is collapsed and update the regression expectation.

Author: ComputelessComputer

apps/desktop/src/session/components/outer-header/index.test.tsx

@@ -164,7 +164,7 @@ describe("OuterHeader", () => {
     const header = titleSlot?.parentElement;
 
     expect(header?.className).toContain("pl-[156px]");
-    expect(header?.className).toContain("h-11");
+    expect(header?.className).toContain("h-12");
     expect(header?.className).not.toContain("pb-1");
     expect(titleWrapper?.classList.contains("w-full")).toBe(false);
     expect(titleWrapper?.className).toContain("max-w-full");

apps/desktop/src/session/components/outer-header/index.tsx

@@ -37,7 +37,7 @@ export function OuterHeader({
     <div
       className={cn([
         "relative flex w-full items-center",
-        showSidebarTimelineHeaderGutter ? "h-11" : "h-12",
+        "h-12",
         showSidebarTimelineHeaderGutter && "pl-[156px]",
       ])}
     >