fix(rgi+portal): default sort desc by termen, fix overlaps, tooltip

RGI (both pages):
- Default sort: Termen descrescator (cel mai in viitor sus)

Portal map:
- Basemap switcher moved left (right-12) to avoid zoom controls overlap
- Selection toolbar moved up (bottom-8) to avoid attribution overlap
- Download button has title tooltip on mobile cards

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/app/(modules)/rgi-test/page.tsx

@@ -577,7 +577,7 @@ export default function RgiTestPage() {
     "solved",
   );
   const [searchQuery, setSearchQuery] = useState("");
-  const [sortState, setSortState] = useState<SortState>(null);
+  const [sortState, setSortState] = useState<SortState>({ key: "dueDate", dir: "desc" });
 
   // Column visibility
   const [visibleCols, setVisibleCols] = useState<Set<string>>(