Merge PR #520 from NikitkaRa: Insert: Summary, Section and Slide Zoom with Return to Zoom

Fix-ups in the merge (review): zoom targets, sections and titles are looked up with get()
instead of indexing; Hyperlink literals carry both main's sound fields and zoom_return;
duplicated test statements left by the test-file union are removed.

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

crates/pptx/src/read/dml.rs

@@ -489,6 +489,7 @@ pub fn hyperlink(imp: &mut Imp, part: &Part, h: &El) -> Option<Hyperlink> {
         highlight_click: h.bool("highlightClick").unwrap_or(false),
         stop_sound: h.bool("endSnd").unwrap_or(false),
         sound: h.child("snd").and_then(|s| media_ref(imp, part, s)),
+        zoom_return: None,
     })
 }
 

crates/pptx/src/write/shapes.rs

@@ -783,6 +783,7 @@ fn media(w: &mut W, x: &mut Exp, o: &mut Out, id: u32, s: &Shape, m: &deckcraft_
             highlight_click: false,
             sound: None,
             stop_sound: false,
+            zoom_return: None,
         });
     }
     cnvpr(w, x, o, id, &s2);