Tests: drop the units test's PNG debug hook; the PDF link test's doc says only web and mail links export

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

crates/pdf/src/tests.rs

@@ -139,8 +139,9 @@ fn text_layer_links_and_bookmarks_survive_serialization() {
     }
 }
 
-/// Links from an untrusted deck: scripts, `data:` and network shares (a UNC path leaks the user's
-/// NTLM credentials on Windows) do not become PDF links; web, mail, local and relative links do.
+/// Links from an untrusted deck: only web and mail links become PDF links. Scripts, `data:`,
+/// local and relative files, OS protocol handlers and network shares (a UNC path leaks the user's
+/// NTLM credentials on Windows) do not.
 #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test::wasm_bindgen_test)]
 #[cfg_attr(not(target_arch = "wasm32"), test)]
 fn unsafe_url_links_are_not_exported() {

crates/ui-egui/src/units_tests.rs

@@ -50,9 +50,6 @@ fn the_format_pane_shows_and_takes_centimetres() {
     app.ui.tab = "Shape Format".into();
     let mut h = harness(app);
     h.run_steps(3);
-    if let (Ok(path), Ok(img)) = (std::env::var("DECKCRAFT_PNG_OUT_UNITS"), h.render()) {
-        let _ = img.save(path);
-    }
     h.state_mut().ui.tab = "Home".into();
     h.run_steps(3);
     let shown = text_values(&h);