fix(admin): header logo alignment + sidebar version tag

- Move app-logo out of flex-grow-1 div to be direct child of app-header
  (matches SmartAdmin CSS expectations for .app-header .app-logo)
- Remove inline style padding-left from logo, rely on SCSS padding
- Remove data-prefix attribute that positioned version text absolutely
- Override .app-logo > svg.sa-icon min-width (was 11rem) to natural
  icon size (1.5rem) so icon and text align inline
- Add .logo-text class for proper text sizing and nowrap
- Fix conflicting responsive classes on header buttons
  (d-sm-block d-sm-none → d-none d-lg-block)
- Fix fullscreen button aria-label (was 'Toggle Dark Mode')
- Remove w-100 from header inner div that pushed buttons off-screen
- Replace wifi icon in nav-footer with tag icon + version text v1.0

src/admin/views/partials/app-sidebar.ejs

@@ -24,9 +24,12 @@
     </nav>
 
     <div class="nav-footer">
-        <svg class="sa-icon sa-thin">
-            <use href="/icons/sprite.svg#wifi"></use>
-        </svg>
+        <div class="d-flex align-items-center gap-2">
+            <svg class="sa-icon sa-thin">
+                <use href="/icons/sprite.svg#tag"></use>
+            </svg>
+            <span class="fs-xs opacity-70">v1.0</span>
+        </div>
     </div>
 </aside>