fix(android): export android_main and gate desktop-only window config

Three changes to get the APK past the NativeActivity launch crash:

1. Export `android_main` — NativeActivity dlopen-s libsolitaire_app.so
   and calls `android_main` as its entry point. Without the symbol the
   app crashed immediately with UnsatisfiedLinkError. The function sets
   bevy::android::ANDROID_APP (required by WinitPlugin) then delegates
   to the existing `run()`.

2. Gate `resize_constraints` to non-Android — on Android max_width and
   max_height default to 0.0; Bevy's clamp panicked with min=800 > max=0.

3. Gate `apply_smart_default_window_size` to non-Android — the system
   calls `.clamp(800.0, logical_w)` which panics when the window surface
   reports zero dimensions during early Android lifecycle events. Window
   sizing is OS-controlled on Android so the system is irrelevant there.

Verified: app boots on x86_64 Android 14 emulator (Pixel_7 AVD,
SwiftShader Vulkan), runs for 2+ minutes without crashing. Desktop
build: clippy clean, 1282 tests passing.

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

.idea/.gitignore

@@ -0,0 +1,3 @@
+# Default ignored files
+/shelf/
+/workspace.xml

.idea/Rusty_Solitaire.iml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$" />
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

.idea/markdown.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="MarkdownSettings">
+    <option name="previewPanelProviderInfo">
+      <ProviderInfo name="Compose (experimental)" className="com.intellij.markdown.compose.preview.ComposePanelProvider" />
+    </option>
+  </component>
+</project>

.idea/misc.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectRootManager" version="2" project-jdk-name="26" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>

.idea/modules.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/Rusty_Solitaire.iml" filepath="$PROJECT_DIR$/.idea/Rusty_Solitaire.iml" />
+    </modules>
+  </component>
+</project>

.idea/vcs.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="" vcs="Git" />
+  </component>
+</project>

solitaire_app/src/lib.rs

@@ -116,6 +116,9 @@ pub fn run() {
                         // small enough that a few stray dropped frames from
                         // disabling vsync are imperceptible.
                         present_mode: PresentMode::AutoNoVsync,
+                        // Android windows always fill the screen; max_width/max_height
+                        // default to 0.0, which panics Bevy's clamp when min > max.
+                        #[cfg(not(target_os = "android"))]
                         resize_constraints: bevy::window::WindowResizeConstraints {
                             min_width: 800.0,
                             min_height: 600.0,
@@ -195,6 +198,8 @@ pub fn run() {
     // every fresh launch can flip `disable_smart_default_size` in
     // Settings to opt out. The flag is checked once at startup; a
     // mid-session change applies on the next launch.
+    // Android windows are always full-screen; the OS controls sizing.
+    #[cfg(not(target_os = "android"))]
     if !had_saved_geometry && !settings.disable_smart_default_size {
         app.add_systems(Update, apply_smart_default_window_size);
     }
@@ -335,6 +340,20 @@ fn set_window_icon(
     *applied = true;
 }
 
+/// Android entry point called by NativeActivity after dlopen-ing the `.so`.
+/// Sets the `AndroidApp` handle that Bevy's winit backend reads before
+/// constructing the event loop, then delegates to [`run`].
+///
+/// The `#[bevy_main]` proc-macro would generate the same code but only
+/// works on a function named `main`; our shared entry point is `run`, so
+/// we emit the equivalent expansion manually.
+#[cfg(target_os = "android")]
+#[unsafe(no_mangle)]
+fn android_main(android_app: bevy::android::android_activity::AndroidApp) {
+    let _ = bevy::android::ANDROID_APP.set(android_app);
+    run();
+}
+
 /// Wraps the default panic hook with one that also appends a crash log
 /// to `<data_dir>/crash.log` (next to `settings.json`). The default hook
 /// still runs afterwards, so stderr output and debugger integration are