Avoid false inserted history without macOS accessibility

Before posting Cmd+V on macOS, check the current Accessibility trust state. If permission has been revoked, keep the transcript on the clipboard and reuse the existing CopiedFallback path instead of recording a successful insertion.

Constraint: Keep issue #62 fix minimal and avoid adding unreliable target-control paste verification

Rejected: AX focused-value readback with timeout | broader and brittle across apps/web editors

Confidence: medium

Scope-risk: narrow

Tested: cargo check --manifest-path openless-all/app/src-tauri/Cargo.toml

Tested: git diff --check

Not-tested: Live macOS Accessibility revoke flow on this host

openless-all/app/src-tauri/src/insertion.rs

@@ -58,6 +58,12 @@ fn copy_to_clipboard(text: &str) -> bool {
 
 #[cfg(target_os = "macos")]
 fn simulate_paste() -> Result<(), String> {
+    if !matches!(
+        crate::permissions::check_accessibility(),
+        crate::permissions::PermissionStatus::Granted
+    ) {
+        return Err("accessibility permission is not granted".into());
+    }
     macos::post_cmd_v()
 }