fix: surface errors and polish UX across Step Library and Batch pages (#92)

- StepLibraryPage: replace silent console.error with toast.error on edit/save
  failures; replace manual setTimeout toast with toast.success helper
- BatchStatusPage: add error state with retry button for failed session loads
  instead of showing ambiguous "No sessions found"
- StepDetailModal: guard clipboard copy against browser denial (no false
  "Copied!" state on permission error); fix dead "See all reviews" button
  with inline expand/collapse toggle
- StepLibraryBrowser: add "Try again" retry button to error state; retry
  increments a counter that re-triggers both load effects

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/components/step-library/StepLibraryBrowser.tsx

@@ -37,6 +37,7 @@ export function StepLibraryBrowser({ onInsert, onCreateNew, showCreateButton = f
   // UI state
   const [previewStepId, setPreviewStepId] = useState<string | null>(null)
   const [collapsedSections, setCollapsedSections] = useState<Record<string, boolean>>({})
+  const [retryCount, setRetryCount] = useState(0)
 
   // Load initial data
   useEffect(() => {
@@ -59,7 +60,7 @@ export function StepLibraryBrowser({ onInsert, onCreateNew, showCreateButton = f
     }
 
     loadInitialData()
-  }, [])
+  }, [retryCount])
 
   // Load steps when filters change
   useEffect(() => {
@@ -92,7 +93,7 @@ export function StepLibraryBrowser({ onInsert, onCreateNew, showCreateButton = f
     }
 
     loadSteps()
-  }, [searchQuery, selectedCategoryId, selectedStepType, minRating, sortBy, selectedTag, refreshKey])
+  }, [searchQuery, selectedCategoryId, selectedStepType, minRating, sortBy, selectedTag, refreshKey, retryCount])
 
   // Group steps by visibility
   const groupedSteps = useMemo(() => {
@@ -250,8 +251,14 @@ export function StepLibraryBrowser({ onInsert, onCreateNew, showCreateButton = f
             <Loader2 className="h-8 w-8 animate-spin text-muted-foreground" />
           </div>
         ) : error ? (
-          <div className="rounded-lg border border-red-400/20 bg-red-400/10 p-4 text-center text-sm text-red-400">
-            {error}
+          <div className="rounded-lg border border-red-400/20 bg-red-400/10 p-4 text-center">
+            <p className="text-sm text-red-400 mb-3">{error}</p>
+            <button
+              onClick={() => setRetryCount(c => c + 1)}
+              className="rounded-md border border-border px-3 py-1.5 text-sm text-muted-foreground hover:bg-accent hover:text-foreground transition-colors"
+            >
+              Try again
+            </button>
           </div>
         ) : steps.length === 0 ? (
           <div className="rounded-lg border border-border bg-accent/50 p-12 text-center">