feat(export): default-view option, Cyrillic PDF, per-wall projection pages

- Add 'Default View' scope to PNG export (fit-to-room for 2D, birds-eye for 3D)
- PDF now includes 3D top view, 2D default view, and every wall projection
- Embed DejaVu Sans TTF so Cyrillic room names render correctly in PDFs
- Preserve image aspect ratios and top-align on PDF pages
- Render each wall projection on its own PDF page at native aspect
- Mount a hidden per-wall projection renderer during export so all walls
  are captured even when the visible panel is in tab mode
- Keep 3D view mounted off-screen once requested so PDF can always snap
  to birds-eye without a visible view switch
- Outlet projection coordinate labels now show 3 decimal places

package-lock.json

@@ -27,6 +27,7 @@
         "@house-plan-maker/shared": "*",
         "@react-three/drei": "^10.7.7",
         "@react-three/fiber": "^9.5.0",
+        "dejavu-fonts-ttf": "^2.37.3",
         "i18next": "^26.0.3",
         "i18next-browser-languagedetector": "^8.2.1",
         "jspdf": "^4.2.1",
@@ -3161,6 +3162,11 @@
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       "devOptional": true
     },
+    "node_modules/dejavu-fonts-ttf": {
+      "version": "2.37.3",
+      "resolved": "https://registry.npmjs.org/dejavu-fonts-ttf/-/dejavu-fonts-ttf-2.37.3.tgz",
+      "integrity": "sha512-f1hd7jJbeQa1VWcw+K2KrTXS50zTMaHpVC4XIKJpNcDeYR5ajMtj/iLlQDYNvLOKamUB3ARVVCf79lNwNVztSQ=="
+    },
     "node_modules/dequal": {
       "version": "2.0.3",
       "resolved": "https://registry.npmjs.org/dequal/-/dequal-2.0.3.tgz",
@@ -7191,6 +7197,7 @@
         "@types/react-dom": "^19.0.0",
         "@types/three": "^0.183.1",
         "@vitejs/plugin-react": "^4.3.0",
+        "dejavu-fonts-ttf": "*",
         "i18next": "^26.0.3",
         "i18next-browser-languagedetector": "^8.2.1",
         "jsdom": "^26.0.0",
@@ -8513,6 +8520,11 @@
       "integrity": "sha512-f8mefEW4WIVg4LckePx3mALjQSPQgFlg9U8yaPdlsbdYcHQyj9n2zL2LJEA52smeYxOvmd/nB7TpMtHGMTHcug==",
       "devOptional": true
     },
+    "dejavu-fonts-ttf": {
+      "version": "2.37.3",
+      "resolved": "https://registry.npmjs.org/dejavu-fonts-ttf/-/dejavu-fonts-ttf-2.37.3.tgz",
+      "integrity": "sha512-f1hd7jJbeQa1VWcw+K2KrTXS50zTMaHpVC4XIKJpNcDeYR5ajMtj/iLlQDYNvLOKamUB3ARVVCf79lNwNVztSQ=="
+    },
     "dequal": {
       "version": "2.0.3",
       "resolved": "https://registry.npmjs.org/dequal/-/dequal-2.0.3.tgz",