fix(ui): enable scroll wheel in selectors inside dialogs

Radix Dialog wraps content in react-remove-scroll, which blocks wheel
events on portaled Popover content (rendered outside the Dialog DOM
tree). Add a disablePortal option to PopoverContent and use it for all
InlineEntitySelector instances inside NewIssueDialog so the Popover
stays in the Dialog's DOM tree and scrolling works.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

ui/src/components/InlineEntitySelector.tsx

@@ -21,6 +21,8 @@ interface InlineEntitySelectorProps {
   className?: string;
   renderTriggerValue?: (option: InlineEntityOption | null) => ReactNode;
   renderOption?: (option: InlineEntityOption, isSelected: boolean) => ReactNode;
+  /** Skip the Portal so the popover stays in the DOM tree (fixes scroll inside Dialogs). */
+  disablePortal?: boolean;
 }
 
 export const InlineEntitySelector = forwardRef<HTMLButtonElement, InlineEntitySelectorProps>(
@@ -37,6 +39,7 @@ export const InlineEntitySelector = forwardRef<HTMLButtonElement, InlineEntitySe
       className,
       renderTriggerValue,
       renderOption,
+      disablePortal,
     },
     ref,
   ) {
@@ -114,6 +117,7 @@ export const InlineEntitySelector = forwardRef<HTMLButtonElement, InlineEntitySe
           side="bottom"
           collisionPadding={16}
           className="w-[min(20rem,calc(100vw-2rem))] p-1"
+          disablePortal={disablePortal}
           onOpenAutoFocus={(event) => {
             event.preventDefault();
             // On touch devices, don't auto-focus the search input to avoid