feat: implement OS bridge and enhance app launcher functionality

crates/plugins/plugin-files/src/platform.rs

@@ -0,0 +1,9 @@
+#[cfg(unix)]
+pub fn home_dir() -> Option<String> {
+    std::env::var("HOME").ok()
+}
+
+#[cfg(windows)]
+pub fn home_dir() -> Option<String> {
+    std::env::var("USERPROFILE").ok()
+}