Split launch_ui::wire into one function per section

The 225-line wire() registered the launch screen's callbacks in nine
comment-delimited sections. Lift them into fn's, merging a few adjacent
ones that were only a handful of lines each: wire_sign_in covers both the
browser flow and the app-password fallback (the same button in two forms),
wire_choose_folder_and_open covers opening the folder browser and the
final "Open library" press, since both are short and sit back to back.
wire_use_folder, wire_sign_out, wire_formats, wire_folder_picker_navigation
and wire_copy_url stay as they were sectioned. wire() calls each in the
original order and keeps the closing render() call, which every section
relies on having run once at startup.

ui/dr-ui/src/launch_ui.rs

@@ -91,7 +91,19 @@ pub fn wire<F>(window: &AppWindow, controller: Rc<LaunchController>, on_open_lib
 where
     F: Fn(Account) + 'static,
 {
-    // --- sign in -------------------------------------------------------
+    wire_sign_in(window, &controller);
+    wire_use_folder(window, &controller);
+    wire_sign_out(window, &controller);
+    wire_formats(window, &controller);
+    wire_choose_folder_and_open(window, &controller, on_open_library);
+    wire_folder_picker_navigation(window, &controller);
+    wire_copy_url(window, &controller);
+
+    render(window, &controller);
+}
+
+/// Sign in: the browser flow, and the app-password fallback.
+fn wire_sign_in(window: &AppWindow, controller: &Rc<LaunchController>) {
     {
         let weak = window.as_weak();
         let ctl = controller.clone();
@@ -117,7 +129,7 @@ where
         });
     }
 
-    // --- sign in with an app password -----------------------------------
+    // Sign in with an app password.
     {
         let weak = window.as_weak();
         let ctl = controller.clone();
@@ -144,13 +156,15 @@ where
             );
         });
     }
+}
 
-    // --- use a folder ---------------------------------------------------
-    //
-    // No thread, no waiting state, no credential: the whole sign-in is a
-    // `stat`. That asymmetry with the browser flow above is not a special
-    // case in the screen — it is what [`SignIn::EndpointOnly`] means, and any
-    // future connector declaring it lands here rather than in new code.
+/// Use a folder.
+///
+/// No thread, no waiting state, no credential: the whole sign-in is a
+/// `stat`. That asymmetry with the browser flow above is not a special
+/// case in the screen — it is what [`SignIn::EndpointOnly`] means, and any
+/// future connector declaring it lands here rather than in new code.
+fn wire_use_folder(window: &AppWindow, controller: &Rc<LaunchController>) {
     {
         let weak = window.as_weak();
         let ctl = controller.clone();
@@ -166,8 +180,10 @@ where
             render(&w, &ctl);
         });
     }
+}
 
-    // --- sign out ------------------------------------------------------
+/// Sign out.
+fn wire_sign_out(window: &AppWindow, controller: &Rc<LaunchController>) {
     {
         let weak = window.as_weak();
         let ctl = controller.clone();
@@ -186,8 +202,10 @@ where
             render(&w, &ctl);
         });
     }
+}
 
-    // --- format tick-boxes ---------------------------------------------
+/// Format tick-boxes.
+fn wire_formats(window: &AppWindow, controller: &Rc<LaunchController>) {
     {
         let weak = window.as_weak();
         let ctl = controller.clone();
@@ -210,8 +228,16 @@ where
             render(&w, &ctl);
         });
     }
+}
 
-    // --- choose folder --------------------------------------------------
+/// Choose folder, and open library.
+fn wire_choose_folder_and_open<F>(
+    window: &AppWindow,
+    controller: &Rc<LaunchController>,
+    on_open_library: F,
+) where
+    F: Fn(Account) + 'static,
+{
     {
         let weak = window.as_weak();
         let ctl = controller.clone();
@@ -223,7 +249,7 @@ where
         });
     }
 
-    // --- open library ---------------------------------------------------
+    // Open library.
     {
         let weak = window.as_weak();
         let ctl = controller.clone();
@@ -236,8 +262,10 @@ where
             }
         });
     }
+}
 
-    // --- folder picker navigation ---------------------------------------
+/// Folder picker navigation.
+fn wire_folder_picker_navigation(window: &AppWindow, controller: &Rc<LaunchController>) {
     {
         let weak = window.as_weak();
         let ctl = controller.clone();
@@ -296,8 +324,10 @@ where
             render(&w, &ctl);
         });
     }
+}
 
-    // --- copy the login URL ---------------------------------------------
+/// Copy the login URL.
+fn wire_copy_url(window: &AppWindow, controller: &Rc<LaunchController>) {
     {
         let ctl = controller.clone();
         window.on_launch_copy_url(move || {
@@ -310,8 +340,6 @@ where
             log::info!("login url: {url}");
         });
     }
-
-    render(window, &controller);
 }
 
 /// TRACES: FR-NC-13