v1.3.0: Refactoring Phase 3+4, Symbol-Verwaltung Redesign, Schlauch-Labels Fix

- Refactoring: Error Boundaries, apiFetch Wrapper, Socket Status-Tracking
- Refactoring: UI Kontrast (theme-aware colors), unused imports bereinigt
- Symbol-Verwaltung: Neues Split-Panel (Meine Symbole + Bibliothek)
- Symbol-Verwaltung: Umbenennen (TLF rot/blau), Duplikate erlaubt
- Symbol-Verwaltung: Karten-Sidebar zeigt eigene Symbole bevorzugt
- Schlauch-Labels: Groessere Schrift (13px/10px), verschiebbar (Drag)
- Schema: TenantSymbol customName, sortOrder, unique constraint entfernt
- Open Source Referenz entfernt (kostenloses Projekt)

src/hooks/use-keyboard-shortcuts.ts

@@ -0,0 +1,74 @@
+import { useEffect, useCallback } from 'react'
+import type { DrawMode, DrawFeature } from '@/types'
+
+interface UseKeyboardShortcutsOptions {
+  featuresRef: React.MutableRefObject<DrawFeature[]>
+  onUndo: () => void
+  onRedo: () => void
+  onSave: () => void
+  onDelete: (newFeatures: DrawFeature[]) => void
+  onToolChange: (mode: DrawMode) => void
+  onHelpOpen: () => void
+}
+
+const TOOL_SHORTCUTS: Record<string, DrawMode> = {
+  'v': 'select', 's': 'select',
+  'p': 'point',
+  'l': 'linestring',
+  'g': 'polygon',
+  'r': 'rectangle',
+  'c': 'circle',
+  'f': 'freehand',
+  'a': 'arrow',
+  't': 'text',
+  'e': 'eraser',
+  'm': 'measure',
+  'd': 'dangerzone',
+}
+
+export function useKeyboardShortcuts({
+  featuresRef,
+  onUndo,
+  onRedo,
+  onSave,
+  onDelete,
+  onToolChange,
+  onHelpOpen,
+}: UseKeyboardShortcutsOptions) {
+  useEffect(() => {
+    const handleKeyDown = (e: KeyboardEvent) => {
+      // Ignore when typing in inputs/textareas
+      const tag = (e.target as HTMLElement)?.tagName
+      if (tag === 'INPUT' || tag === 'TEXTAREA' || tag === 'SELECT' || (e.target as HTMLElement)?.isContentEditable) return
+
+      // ? or F1 → help
+      if (e.key === '?' || e.key === 'F1') { e.preventDefault(); onHelpOpen(); return }
+
+      // DEL / Backspace → delete selected feature(s)
+      if (e.key === 'Delete' || e.key === 'Backspace') {
+        e.preventDefault()
+        const current = featuresRef.current
+        const selected = current.filter(f => f.properties?._selected)
+        if (selected.length > 0) {
+          onDelete(current.filter(f => !f.properties?._selected))
+        }
+        return
+      }
+
+      // Ctrl/Cmd shortcuts
+      if (e.ctrlKey || e.metaKey) {
+        if (e.key === 'z' && e.shiftKey) { e.preventDefault(); onRedo(); return }
+        if (e.key === 'z') { e.preventDefault(); onUndo(); return }
+        if (e.key === 'y') { e.preventDefault(); onRedo(); return }
+        if (e.key === 's') { e.preventDefault(); onSave(); return }
+        return
+      }
+
+      // Tool shortcuts (single key, no modifier)
+      const mode = TOOL_SHORTCUTS[e.key.toLowerCase()]
+      if (mode) { e.preventDefault(); onToolChange(mode); return }
+    }
+    window.addEventListener('keydown', handleKeyDown)
+    return () => window.removeEventListener('keydown', handleKeyDown)
+  }, [featuresRef, onUndo, onRedo, onSave, onDelete, onToolChange, onHelpOpen])
+}