v0.13.0: UI polish fixes (8 improvements)

- Fix 1: Dashboard backup card border (verified already correct)
- Fix 2: Show auto-generated env values on deploy page with copy/reveal
- Fix 3: Temperature value pill for better visibility on dashboard
- Fix 4: Rework dashboard backup section (remove manual trigger, add Tier 2 summary)
- Fix 5: Scope HDD warning banner to dashboard and monitoring pages only
- Fix 6: Move Tárhely section up in monitoring page
- Fix 7: Snapshot table clarity (HOZZÁADOTT header, n/a instead of -)
- Fix 8: Restructure Tároló section into tiered storage view

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

controller/internal/web/templates/layout.html

@@ -31,12 +31,14 @@
 {{if .Alerts}}
 <div class="alerts-container">
     {{range .Alerts}}
+    {{if or (not .PageOnly) (pageMatch .PageOnly $.Page)}}
     <div class="alert-banner alert-banner-{{.Level}}">
         <span class="alert-icon">{{if eq .Level "error"}}🔴{{else if eq .Level "warning"}}🟡{{else}}ℹ️{{end}}</span>
         <span class="alert-message">{{.Message}}</span>
         {{if .Link}}<a href="{{.Link}}" class="alert-link">{{.LinkText}} →</a>{{end}}
     </div>
     {{end}}
+    {{end}}
 </div>
 {{end}}
 {{end}}