feat v1.34.0: island rooms — nested contours with evenodd holes

- roomsOverlap: full nesting is legal (islands), edge crossings and
  partial overlaps still rejected; polyContainsPoly + islandsOf pure
  helpers (+2 unit tests, 94 total)
- draw tool: per-click point-in-room rejection removed, validation at
  contour closing; parent rooms with islands render as evenodd paths
  (ring fills correctly, island stays clickable through the hole)
- smoke_island_rooms.mjs; smoke_merge_split stale room-count asserts
  fixed (rg pushed a 5th room; cancelWhole silently false for ages)
- TESTING/CHANGELOG same-commit

demo/smoke_merge_split.mjs

@@ -56,14 +56,14 @@ out.splitPending = (await S()).pendingSplit;
 out.splitDialog = (await S()).roomDlg;
 // cancel keeps it whole
 await page.evaluate(()=>window.__card._roomDialogCancel());
-out.cancelWhole = (await S()).rooms.length===4;
+out.cancelWhole = (await S()).rooms.length===5; // 4 базовых + rg
 // redo + confirm with a name (no area)
 await page.evaluate((p)=>window.__card._splitClick(p), await R(0.28,0.28));
 await page.evaluate((p)=>window.__card._splitClick(p), await R(0.25,0.0625));
 await page.evaluate((p)=>window.__card._splitClick(p), await R(0.25,0.5));
 await page.evaluate(()=>{const c=window.__card; c._nameSel='Cabinet'; c._saveRoomNoArea();});
 s = await S();
-out.splitRooms = s.rooms.length;                          // 5
+out.splitRooms = s.rooms.length===6;                      // 4 базовых + rg разрезанная надвое
 out.bigKeepsLiving = s.rooms.some(r=>r.id==='r1' && r.area==='living_room');
 out.newRoom = s.rooms.find(r=>!['r1','r2','r3','r4','rg'].includes(r.id))?.name;
 await restore();