M7.7: Type → Find Font… (fonts in document with missing ones flagged, Find, Change, Change All; engine: text.fonts, text.replaceFont, select.font)

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

crates/engine/src/cmd/mod.rs

@@ -13,6 +13,7 @@ mod draw2;
 mod edit;
 mod effectcmd;
 mod file;
+mod fonts;
 mod layer;
 mod live;
 pub(crate) mod menucmds;
@@ -154,6 +155,7 @@ pub fn command_specs() -> &'static [CommandSpec] {
         v.extend(typemenu::specs());
         v.extend(textedit::specs());
         v.extend(textstyles::specs());
+        v.extend(fonts::specs());
         v.extend(threads::specs());
         v.extend(docmenu::specs());
         v.extend(docinfo::specs());