feat(v0.11.6): FileBrowser auto-mount sync + UI polish

- Add syncFileBrowserMounts() and generateFileBrowserCompose() to handlers.go
- Call syncFileBrowserMounts() after storage path add (storage init) and remove
- settings.html: red 'Nincs csatolva!' badge → yellow 'Rendszermeghajtón' (badge-warn)
- settings.html: 'Alapértelmezett' button → 'Legyen alapértelmezett' (action clarity)
- storage_init.html: replace disk-usage zone gradient bar with clean progress-bar-task
- style.css: add .badge-warn and .progress-bar-task CSS classes

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

controller/internal/web/templates/settings.html

@@ -86,7 +86,7 @@
                 <div class="storage-path-badges">
                     {{if .IsDefault}}<span class="badge state-green">Alapértelmezett</span>{{end}}
                     {{if .Schedulable}}<span class="badge" style="background:rgba(0,136,204,0.15);color:var(--accent-light)">Aktív</span>{{else}}<span class="badge state-gray">Inaktív</span>{{end}}
-                    {{if not .IsMounted}}<span class="badge state-red">Nincs csatolva!</span>{{end}}
+                    {{if not .IsMounted}}<span class="badge badge-warn">Rendszermeghajtón</span>{{end}}
                 </div>
             </div>
             <div class="storage-path-details">
@@ -131,7 +131,7 @@
                 {{if not .IsDefault}}
                 <form method="POST" action="/settings/storage/default" style="display:inline">
                     <input type="hidden" name="storage_path" value="{{.Path}}">
-                    <button type="submit" class="btn btn-xs btn-outline">Alapértelmezett</button>
+                    <button type="submit" class="btn btn-xs btn-outline">Legyen alapértelmezett</button>
                 </form>
                 {{end}}
                 {{if .Schedulable}}