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.

docs/dev/traceability.md

@@ -110,10 +110,10 @@ A tag naming an ID `requirements.md` does not define — what renumbering produc
 | FR-MRG-6 | [`core/dr-pipeline/src/sidecar.rs:1033`](../../core/dr-pipeline/src/sidecar.rs#L1033), [`core/dr-pipeline/src/sidecar.rs:113`](../../core/dr-pipeline/src/sidecar.rs#L113), [`core/dr-pipeline/src/sidecar.rs:123`](../../core/dr-pipeline/src/sidecar.rs#L123), [`core/dr-pipeline/src/sidecar.rs:2241`](../../core/dr-pipeline/src/sidecar.rs#L2241), [`core/dr-pipeline/src/sidecar.rs:841`](../../core/dr-pipeline/src/sidecar.rs#L841), [`ui/dr-ui/src/merge.rs:842`](../../ui/dr-ui/src/merge.rs#L842) |
 | FR-MRG-7 | [`ui/dr-ui/src/merge.rs:1`](../../ui/dr-ui/src/merge.rs#L1), [`ui/dr-ui/src/merge_ui.rs:1`](../../ui/dr-ui/src/merge_ui.rs#L1), [`ui/dr-ui/ui/app.slint:829`](../../ui/dr-ui/ui/app.slint#L829), [`ui/dr-ui/ui/merge.slint:1`](../../ui/dr-ui/ui/merge.slint#L1) |
 | FR-MRG-8 | [`core/dr-pano/src/xfeat.rs:1`](../../core/dr-pano/src/xfeat.rs#L1), [`core/dr-segment/examples/onnx_probe.rs:1`](../../core/dr-segment/examples/onnx_probe.rs#L1) |
-| FR-NC-1 | [`core/dr-sync-nextcloud/src/auth.rs:132`](../../core/dr-sync-nextcloud/src/auth.rs#L132), [`core/dr-sync-nextcloud/src/auth.rs:44`](../../core/dr-sync-nextcloud/src/auth.rs#L44), [`core/dr-sync-nextcloud/src/provider.rs:1`](../../core/dr-sync-nextcloud/src/provider.rs#L1), [`core/dr-sync/src/account.rs:375`](../../core/dr-sync/src/account.rs#L375), [`ui/dr-ui/src/launch.rs:316`](../../ui/dr-ui/src/launch.rs#L316), [`ui/dr-ui/src/launch.rs:61`](../../ui/dr-ui/src/launch.rs#L61), [`ui/dr-ui/src/launch_ui.rs:418`](../../ui/dr-ui/src/launch_ui.rs#L418) |
+| FR-NC-1 | [`core/dr-sync-nextcloud/src/auth.rs:132`](../../core/dr-sync-nextcloud/src/auth.rs#L132), [`core/dr-sync-nextcloud/src/auth.rs:44`](../../core/dr-sync-nextcloud/src/auth.rs#L44), [`core/dr-sync-nextcloud/src/provider.rs:1`](../../core/dr-sync-nextcloud/src/provider.rs#L1), [`core/dr-sync/src/account.rs:375`](../../core/dr-sync/src/account.rs#L375), [`ui/dr-ui/src/launch.rs:316`](../../ui/dr-ui/src/launch.rs#L316), [`ui/dr-ui/src/launch.rs:61`](../../ui/dr-ui/src/launch.rs#L61), [`ui/dr-ui/src/launch_ui.rs:446`](../../ui/dr-ui/src/launch_ui.rs#L446) |
 | FR-NC-10 | [`core/dr-sync/src/account.rs:240`](../../core/dr-sync/src/account.rs#L240), [`ui/dr-ui/src/export.rs:1`](../../ui/dr-ui/src/export.rs#L1), [`ui/dr-ui/src/lib.rs:680`](../../ui/dr-ui/src/lib.rs#L680), [`ui/dr-ui/src/library.rs:1234`](../../ui/dr-ui/src/library.rs#L1234), [`ui/dr-ui/src/library.rs:2527`](../../ui/dr-ui/src/library.rs#L2527), [`ui/dr-ui/src/library.rs:653`](../../ui/dr-ui/src/library.rs#L653), [`ui/dr-ui/src/library.rs:980`](../../ui/dr-ui/src/library.rs#L980), [`ui/dr-ui/src/library_ui.rs:2057`](../../ui/dr-ui/src/library_ui.rs#L2057), [`ui/dr-ui/src/library_ui.rs:4249`](../../ui/dr-ui/src/library_ui.rs#L4249), [`ui/dr-ui/src/library_ui.rs:662`](../../ui/dr-ui/src/library_ui.rs#L662), [`ui/dr-ui/src/sidecar_cache.rs:1`](../../ui/dr-ui/src/sidecar_cache.rs#L1) |
 | FR-NC-12 | [`core/dr-sync-folder/src/lib.rs:1`](../../core/dr-sync-folder/src/lib.rs#L1), [`core/dr-sync-nextcloud/src/lib.rs:1049`](../../core/dr-sync-nextcloud/src/lib.rs#L1049), [`core/dr-sync-nextcloud/src/lib.rs:40`](../../core/dr-sync-nextcloud/src/lib.rs#L40), [`core/dr-sync-nextcloud/src/provider.rs:1`](../../core/dr-sync-nextcloud/src/provider.rs#L1), [`core/dr-sync/src/account.rs:1`](../../core/dr-sync/src/account.rs#L1), [`core/dr-sync/src/account.rs:87`](../../core/dr-sync/src/account.rs#L87), [`core/dr-sync/src/lib.rs:218`](../../core/dr-sync/src/lib.rs#L218), [`core/dr-sync/src/lib.rs:51`](../../core/dr-sync/src/lib.rs#L51), [`core/dr-sync/src/provider.rs:106`](../../core/dr-sync/src/provider.rs#L106), [`core/dr-sync/src/provider.rs:1`](../../core/dr-sync/src/provider.rs#L1), [`core/dr-sync/src/provider.rs:53`](../../core/dr-sync/src/provider.rs#L53), [`core/dr-sync/src/reachability.rs:1`](../../core/dr-sync/src/reachability.rs#L1), [`ui/dr-ui/src/remote.rs:1`](../../ui/dr-ui/src/remote.rs#L1) |
-| FR-NC-13 | [`core/dr-sync-folder/src/lib.rs:197`](../../core/dr-sync-folder/src/lib.rs#L197), [`core/dr-sync-folder/src/lib.rs:1`](../../core/dr-sync-folder/src/lib.rs#L1), [`core/dr-sync-folder/src/lib.rs:73`](../../core/dr-sync-folder/src/lib.rs#L73), [`core/dr-sync/src/provider.rs:106`](../../core/dr-sync/src/provider.rs#L106), [`ui/dr-ui/src/launch_ui.rs:317`](../../ui/dr-ui/src/launch_ui.rs#L317), [`ui/dr-ui/src/remote.rs:1`](../../ui/dr-ui/src/remote.rs#L1) |
+| FR-NC-13 | [`core/dr-sync-folder/src/lib.rs:197`](../../core/dr-sync-folder/src/lib.rs#L197), [`core/dr-sync-folder/src/lib.rs:1`](../../core/dr-sync-folder/src/lib.rs#L1), [`core/dr-sync-folder/src/lib.rs:73`](../../core/dr-sync-folder/src/lib.rs#L73), [`core/dr-sync/src/provider.rs:106`](../../core/dr-sync/src/provider.rs#L106), [`ui/dr-ui/src/launch_ui.rs:345`](../../ui/dr-ui/src/launch_ui.rs#L345), [`ui/dr-ui/src/remote.rs:1`](../../ui/dr-ui/src/remote.rs#L1) |
 | FR-NC-2 | [`core/dr-sync/src/account.rs:1`](../../core/dr-sync/src/account.rs#L1), [`core/dr-sync/src/account.rs:318`](../../core/dr-sync/src/account.rs#L318), [`core/dr-sync/src/account.rs:375`](../../core/dr-sync/src/account.rs#L375), [`core/dr-sync/src/account.rs:59`](../../core/dr-sync/src/account.rs#L59), [`platform/dr-plat/src/secrets.rs:82`](../../platform/dr-plat/src/secrets.rs#L82) |
 | FR-NC-3 | [`core/dr-decode/src/locate.rs:1`](../../core/dr-decode/src/locate.rs#L1), [`core/dr-decode/src/preview.rs:148`](../../core/dr-decode/src/preview.rs#L148), [`core/dr-sync/src/capability.rs:85`](../../core/dr-sync/src/capability.rs#L85), [`core/dr-thumbs/src/lib.rs:1`](../../core/dr-thumbs/src/lib.rs#L1), [`core/dr-types/src/place.rs:1`](../../core/dr-types/src/place.rs#L1), [`ui/dr-ui/src/library.rs:1`](../../ui/dr-ui/src/library.rs#L1), [`ui/dr-ui/src/library.rs:3940`](../../ui/dr-ui/src/library.rs#L3940), [`ui/dr-ui/src/library_ui.rs:1`](../../ui/dr-ui/src/library_ui.rs#L1), [`ui/dr-ui/src/library_ui.rs:4515`](../../ui/dr-ui/src/library_ui.rs#L4515), [`ui/dr-ui/src/library_ui.rs:6027`](../../ui/dr-ui/src/library_ui.rs#L6027), [`ui/dr-ui/ui/app.slint:387`](../../ui/dr-ui/ui/app.slint#L387), [`ui/dr-ui/ui/settings.slint:435`](../../ui/dr-ui/ui/settings.slint#L435), [`ui/dr-ui/ui/settings.slint:73`](../../ui/dr-ui/ui/settings.slint#L73) |
 | FR-NC-4 | [`core/dr-sync-folder/src/lib.rs:197`](../../core/dr-sync-folder/src/lib.rs#L197), [`core/dr-sync-nextcloud/src/propfind.rs:103`](../../core/dr-sync-nextcloud/src/propfind.rs#L103), [`core/dr-sync-nextcloud/src/propfind.rs:51`](../../core/dr-sync-nextcloud/src/propfind.rs#L51), [`core/dr-sync/src/capability.rs:6`](../../core/dr-sync/src/capability.rs#L6), [`core/dr-sync/src/lib.rs:218`](../../core/dr-sync/src/lib.rs#L218), [`core/dr-sync/src/scan.rs:129`](../../core/dr-sync/src/scan.rs#L129), [`ui/dr-ui/src/launch.rs:61`](../../ui/dr-ui/src/launch.rs#L61) |
@@ -136,7 +136,7 @@ A tag naming an ID `requirements.md` does not define — what renumbering produc
 | FR-PLAT-LIN-1 | [`core/dr-types/src/settings.rs:1`](../../core/dr-types/src/settings.rs#L1), [`platform/dr-plat/src/dirs.rs:1`](../../platform/dr-plat/src/dirs.rs#L1), [`platform/dr-plat/src/storage.rs:344`](../../platform/dr-plat/src/storage.rs#L344), [`ui/dr-ui/src/lib.rs:1166`](../../ui/dr-ui/src/lib.rs#L1166), [`ui/dr-ui/src/preset_store.rs:1`](../../ui/dr-ui/src/preset_store.rs#L1), [`ui/dr-ui/src/settings_store.rs:1`](../../ui/dr-ui/src/settings_store.rs#L1) |
 | FR-PLAT-LIN-2 | [`platform/dr-plat/src/display.rs:1`](../../platform/dr-plat/src/display.rs#L1), [`platform/dr-plat/src/display/wayland.rs:1`](../../platform/dr-plat/src/display/wayland.rs#L1), [`platform/dr-plat/src/display/x11.rs:1`](../../platform/dr-plat/src/display/x11.rs#L1) |
 | FR-PLAT-WIN-1 | [`platform/dr-plat/src/dirs.rs:1`](../../platform/dr-plat/src/dirs.rs#L1) |
-| FR-PLAT-WIN-2 | [`apps/darkroom-desktop/build.rs:1`](../../apps/darkroom-desktop/build.rs#L1), [`apps/darkroom-desktop/src/main.rs:6`](../../apps/darkroom-desktop/src/main.rs#L6), [`ui/dr-ui/src/launch_ui.rs:820`](../../ui/dr-ui/src/launch_ui.rs#L820) |
+| FR-PLAT-WIN-2 | [`apps/darkroom-desktop/build.rs:1`](../../apps/darkroom-desktop/build.rs#L1), [`apps/darkroom-desktop/src/main.rs:6`](../../apps/darkroom-desktop/src/main.rs#L6), [`ui/dr-ui/src/launch_ui.rs:848`](../../ui/dr-ui/src/launch_ui.rs#L848) |
 | FR-PLAT-WIN-3 | [`apps/darkroom-desktop/src/main.rs:19`](../../apps/darkroom-desktop/src/main.rs#L19) |
 | FR-RAW-1 | [`core/dr-decode/src/lib.rs:259`](../../core/dr-decode/src/lib.rs#L259), [`core/dr-types/src/lib.rs:132`](../../core/dr-types/src/lib.rs#L132), [`core/dr-types/src/lib.rs:203`](../../core/dr-types/src/lib.rs#L203) |
 | FR-RAW-3 | [`core/dr-decode/src/lib.rs:155`](../../core/dr-decode/src/lib.rs#L155), [`core/dr-decode/src/lib.rs:546`](../../core/dr-decode/src/lib.rs#L546), [`core/dr-decode/src/locate.rs:1435`](../../core/dr-decode/src/locate.rs#L1435) |

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 ---------------------------------------------------
+/// Use a folder.
-    //
+///
-    // No thread, no waiting state, no credential: the whole sign-in is a
+/// 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
+/// `stat`. That asymmetry with the browser flow above is not a special
-    // case in the screen — it is what [`SignIn::EndpointOnly`] means, and any
+/// case in the screen — it is what [`SignIn::EndpointOnly`] means, and any
-    // future connector declaring it lands here rather than in new code.
+/// 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