i18n DE/EN + DossierSettings panel + English file renames

i18n:
- src/i18n/de.json + en.json: 200+ keys covering all main panels
- src/i18n/index.js: t(key, vars) reads window.DOSSIER_LANG
- panel_base.py: injects window.DOSSIER_LANG from dossier_settings.json
- EbenenManager, GeschossManager, AusschnitteApp, LayoutsApp: all
  context menus and main labels use t()

DossierSettings panel:
- DossierSettingsApp.jsx: language toggle (DE/EN pill) + launcher status
- toolbar.py: OPEN_SETTINGS opens new Rhino-hosted satellite window,
  SAVE_LANG writes lang to dossier_settings.json + reloads all panels

File renames (JSX → English):
- ZeichnungsebenenApp → DrawingLevelsApp
- GeschossManager/Dialog/Settings → Floor*
- AusschnitteApp/Settings → Viewports*
- EbenenManager/Settings → Layer*
- GestaltungApp → StylesApp, OberleisteApp → ToolbarApp
- WerkzeugeApp → ToolsApp, DimensionenApp → DimensionsApp
- MassstabApp → ScaleApp, KameraApp → CameraApp
- MasseSettingsApp → UnitsSettingsApp
- ConfirmDeleteEbene → ConfirmDeleteLayer
- AusschnittLayerDialog → ViewportLayerDialog

Python module renames:
- rhinopanel.py → layers_panel.py
- oberleiste.py → toolbar.py
- gestaltung.py → styles.py
- werkzeuge.py → tools.py
- dimensionen.py → dimensions.py
- startup.py _MODULE_TO_PY updated, all cross-imports fixed

src/ToolsApp.jsx

@@ -0,0 +1,133 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
+// Copyright (C) 2026 Karim Gabriele Varano
+import { useEffect } from 'react'
+import Icon from './components/Icon'
+import { notifyReady, runRhinoCommand } from './lib/rhinoBridge'
+
+// Tool-Definitionen: [icon, label, rhino-command, tooltip]
+// Material-Symbol-Namen siehe https://fonts.google.com/icons
+const TOOLS = {
+  '2D Zeichnen': [
+    ['horizontal_rule',         'Line',      '_Line',       'Linie zwischen zwei Punkten'],
+    ['polyline',                'Polyline',  '_Polyline',   'Polylinie'],
+    ['rectangle',               'Rect',      '_Rectangle',  'Rechteck'],
+    ['radio_button_unchecked',  'Circle',    '_Circle',     'Kreis'],
+    ['network_intelligence',    'Arc',       '_Arc',        'Bogen'],
+    ['gesture',                 'Curve',     '_Curve',      'Freie Kurve (Spline)'],
+    ['text_fields',             'Text',      '_Text',       'Text'],
+    ['grid_view',               'Hatch',     '_Hatch',      'Schraffur'],
+    ['straighten',              'Dim',       '_Dim',        'Linearbemassung'],
+  ],
+  '2D Editieren': [
+    ['open_with',         'Move',     '_Move',      'Verschieben'],
+    ['content_copy',      'Copy',     '_Copy',      'Kopieren'],
+    ['rotate_right',      'Rotate',   '_Rotate',    'Drehen'],
+    ['aspect_ratio',      'Scale',    '_Scale',     'Skalieren'],
+    ['flip',              'Mirror',   '_Mirror',    'Spiegeln'],
+    ['padding',           'Offset',   '_Offset',    'Parallelversatz'],
+    ['content_cut',       'Trim',     '_Trim',      'Stutzen'],
+    ['swipe_right_alt',   'Extend',   '_Extend',    'Verlängern'],
+    ['link',              'Join',     '_Join',      'Verbinden'],
+    ['scatter_plot',      'Explode',  '_Explode',   'Auflösen'],
+    ['rounded_corner',    'Fillet',   '_Fillet',    'Verrunden (Ecke abrunden)'],
+    ['apps',              'Array',    '_ArrayPolar','Polar-Array'],
+  ],
+  '3D Modellieren': [
+    ['vertical_align_top','Extrude',  '_ExtrudeCrv',         'Kurve zu 3D extrudieren'],
+    ['square',            'Box',      '_Box',                'Quader'],
+    ['join_inner',        'Union',    '_BooleanUnion',       'Boolean-Vereinigung'],
+    ['remove',            'Diff',     '_BooleanDifference',  'Boolean-Differenz'],
+    ['gradient',          'Intersect','_BooleanIntersection','Boolean-Schnittmenge'],
+    ['roofing',           'Cap',      '_Cap',                'Planare Loecher schliessen'],
+    ['cut',               'Section',  '_Section',            'Schnittlinien erzeugen'],
+    ['unfold_more',       'Loft',     '_Loft',               'Loft (Kurven verbinden)'],
+  ],
+  'Auswahl': [
+    ['add_link',         'Chain',     '_SelChain',     'Tangentiale Kurvenkette wählen'],
+    ['filter_alt',       'Dup',       '_SelDup',       'Doppelte Objekte wählen'],
+    ['loop',             'Closed',    '_SelClosedCrv', 'Geschlossene Kurven wählen'],
+    ['compare_arrows',   'Invert',    '_Invert',       'Auswahl invertieren'],
+    ['select_all',       'All',       '_SelAll',       'Alle auswählen'],
+    ['deselect',         'None',      '_SelNone',      'Auswahl aufheben'],
+  ],
+}
+
+// ---------------------------------------------------------------------------
+
+function ToolPill({ icon, label, cmd, tip }) {
+  return (
+    <button
+      onClick={() => runRhinoCommand(cmd)}
+      title={`${tip} (${cmd})`}
+      onMouseEnter={(e) => {
+        e.currentTarget.style.borderColor = 'var(--accent)'
+        e.currentTarget.style.background = 'var(--bg-item-hover)'
+      }}
+      onMouseLeave={(e) => {
+        e.currentTarget.style.borderColor = 'var(--border-light)'
+        e.currentTarget.style.background = 'var(--bg-input)'
+      }}
+      style={{
+        display: 'flex', alignItems: 'center', gap: 6,
+        padding: '5px 10px 5px 8px',
+        background: 'var(--bg-input)',
+        border: '1px solid var(--border-light)',
+        borderRadius: 999,
+        cursor: 'pointer',
+        transition: 'background 0.1s, border-color 0.1s',
+        fontSize: 11, fontWeight: 500,
+        color: 'var(--text-primary)',
+        whiteSpace: 'nowrap',
+        appearance: 'none', WebkitAppearance: 'none',
+      }}
+    >
+      <Icon name={icon} size={14} style={{ color: 'var(--accent)', flexShrink: 0 }} />
+      <span>{label}</span>
+    </button>
+  )
+}
+
+function PillGroup({ label, children }) {
+  return (
+    <div style={{ display: 'flex', flexDirection: 'column', gap: 5 }}>
+      <span style={{
+        fontSize: 9, color: 'var(--text-muted)',
+        letterSpacing: '0.08em', textTransform: 'uppercase',
+        fontWeight: 600,
+      }}>
+        {label}
+      </span>
+      <div style={{ display: 'flex', flexWrap: 'wrap', gap: 5 }}>
+        {children}
+      </div>
+    </div>
+  )
+}
+
+// ---------------------------------------------------------------------------
+
+export default function WerkzeugeApp() {
+  useEffect(() => { notifyReady() }, [])
+
+  const groups = Object.entries(TOOLS)
+
+  return (
+    <div style={{
+      width: '100%', height: '100%',
+      display: 'flex', flexDirection: 'column', gap: 10,
+      padding: 10,
+      fontFamily: 'var(--font)', color: 'var(--text-primary)',
+      background: 'var(--bg-base)',
+      boxSizing: 'border-box',
+      overflowY: 'auto', overflowX: 'hidden',
+    }}>
+      {groups.map(([title, items]) => (
+        <PillGroup key={title} label={title}>
+          {items.map(([icon, label, cmd, tip]) => (
+            <ToolPill key={cmd} icon={icon} label={label} cmd={cmd} tip={tip} />
+          ))}
+        </PillGroup>
+      ))}
+    </div>
+  )
+}