feat: Expo 54 (new arch) support + new in-house download module (#1174)

Signed-off-by: Lance Chant <13349722+lancechant@users.noreply.github.com>
Co-authored-by: sarendsen <coding-mosses0z@icloud.com>
Co-authored-by: Lance Chant <13349722+lancechant@users.noreply.github.com>
Co-authored-by: Gauvain <68083474+Gauvino@users.noreply.github.com>

docs/nested-modals.md

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+# Nested Modals with PlatformDropdown
+
+## Issue
+PlatformDropdowns inside BottomSheetModals don't open on Android.
+
+## Solution
+1. **Add controlled state** for each PlatformDropdown:
+   ```tsx
+   const [open, setOpen] = useState(false);
+   
+   <PlatformDropdown
+     open={open}
+     onOpenChange={setOpen}
+     // ...
+   />
+   ```
+
+2. **Use `View` for triggers, not `TouchableOpacity`**:
+   ```tsx
+   // ✅ Correct
+   <PlatformDropdown
+     trigger={<View>...</View>}
+   />
+   
+   // ❌ Wrong - causes nested TouchableOpacity conflicts
+   <PlatformDropdown
+     trigger={<TouchableOpacity>...</TouchableOpacity>}
+   />
+   ```
+
+3. **Add `stackBehavior='push'` to parent BottomSheetModal**:
+   ```tsx
+   <BottomSheetModal
+     stackBehavior='push'
+     // ...
+   />
+   ```
+
+4. **Reset dropdown states on modal dismiss**:
+   ```tsx
+   const handleDismiss = useCallback(() => {
+     setDropdown1Open(false);
+     setDropdown2Open(false);
+     // reset all dropdown states
+     onDismiss?.();
+   }, [onDismiss]);
+
+   <BottomSheetModal
+     onDismiss={handleDismiss}
+     // ...
+   />
+   ```
+
+## Why
+- PlatformDropdown wraps triggers in TouchableOpacity on Android. Nested TouchableOpacity causes touch event conflicts.
+- PlatformDropdown's useEffect should only call `showModal()` when `open === true`, not call `hideModal()` when `open === false` (interferes with parent modals).
+- Dropdown states must be reset on modal dismiss to prevent them from reopening automatically when parent modal reopens.
+