fix: truncate long bank names in selector dropdown (#505)

Long bank names overflowed the fixed-width selector button. Wraps the
label text in a truncate span so it ellipsizes gracefully.

hindsight-control-plane/src/components/bank-selector.tsx

@@ -375,7 +375,7 @@ function BankSelectorInner() {
               aria-expanded={open}
               className="w-[250px] justify-between font-bold border-2 border-primary hover:bg-accent"
             >
-              {currentBank || "Select a memory bank..."}
+              <span className="truncate">{currentBank || "Select a memory bank..."}</span>
               <ChevronsUpDown className="ml-2 h-4 w-4 shrink-0 opacity-50" />
             </Button>
           </PopoverTrigger>