feat(client): declutter space sidebar and global header

- Remove the large active-space name header in the space sidebar;
  the active space stays highlighted in the spaces grid below.
- Move "Space settings" into the user avatar (top) menu next to
  "Workspace settings"; it shows only while viewing a space and is
  detected via useMatch("/s/:spaceSlug/*").
- Make the brand logo non-selectable/non-draggable (user-select:none
  on .brand, draggable=false on the img).
- Remove the redundant "Home" button next to the logo (the logo
  already links to /home).
- Remove the version label under the Settings sidebar menu.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

apps/client/src/components/ui/brand-logo.tsx

@@ -27,6 +27,7 @@ export function BrandLogo({
       src={src}
       alt="Gitmost"
       className={className}
+      draggable={false}
       style={{ height, width: "auto", display: "block", userSelect: "none" }}
     />
   );