W73: Fix remaining medium-severity error handling gaps

app.rs:199-214 — menubar handle_key now uses if-let instead of
  guarded .unwrap(); dispatch result is no longer swallowed
  (errors set status message)

app.rs:391 — Ctrl-Z suspend kill command error now logged

terminal/mod.rs:118,147 — frame-draw + restore flush() now use
  .ok() pattern instead of let _ = (more explicit intent)

viewer/mod.rs:967 — menubar.take().unwrap() replaced with
  if-let Some(mut mb) pattern

Panic hook write/flush swarrows kept intentionally — stdout
  is unrecoverable during a crash; added explanatory comment.

Tests: 1427 pass, zero warnings.

local/recipes/tui/tlc/source/src/app.rs

@@ -56,7 +56,7 @@ impl Application {
         let keymap = default_keymap();
 
         // MC parity: cursor hidden in panel mode; render() manages visibility.
-        let _ = tui.terminal_mut().hide_cursor();
+        tui.terminal_mut().hide_cursor().ok();
 
         // Initial paint.
         render(&mut tui, &mut fm)?;
@@ -196,9 +196,9 @@ impl Application {
                 continue;
             }
 
-            if fm.menubar.is_some() {
+            if let Some(mb) = fm.menubar.as_mut() {
                 use crate::filemanager::menubar::MenuBarOutcome;
-                let outcome = fm.menubar.as_mut().unwrap().handle_key(key);
+                let outcome = mb.handle_key(key);
                 match outcome {
                     MenuBarOutcome::Running => {}
                     MenuBarOutcome::Dispatch(cmd, target_menu) => {
@@ -210,7 +210,9 @@ impl Application {
                                 fm.switch_focus();
                             }
                         }
-                        let _ = fm.dispatch(cmd);
+                        if let Err(e) = fm.dispatch(cmd) {
+                            fm.status.set_message(format!("{e}"));
+                        }
                     }
                     MenuBarOutcome::Close => {
                         fm.menubar = None;
@@ -351,7 +353,7 @@ fn render(tui: &mut Tui, fm: &mut FileManager) -> Result<()> {
     if need_cursor {
         let _ = tui.terminal_mut().show_cursor();
     } else {
-        let _ = tui.terminal_mut().hide_cursor();
+        tui.terminal_mut().hide_cursor().ok();
     }
     Ok(())
 }

local/recipes/tui/tlc/source/src/terminal/mod.rs

@@ -115,7 +115,7 @@ impl Tui {
         F: FnOnce(&mut ratatui::Frame),
     {
         self.terminal.draw(f)?;
-        let _ = io::stdout().flush();
+        io::stdout().flush().ok();
         Ok(())
     }
 
@@ -144,7 +144,7 @@ impl Tui {
 /// `RawTerminal` (still alive inside the `Tui` struct) handle the
 /// escape sequences to leave the alternate screen and raw mode.
 pub fn restore() {
-    let _ = io::stdout().flush();
+    io::stdout().flush().ok();
 }
 
 /// Install a panic hook that leaves the alternate screen, disables raw

local/recipes/tui/tlc/source/src/viewer/mod.rs

@@ -964,8 +964,7 @@ impl Viewer {
             return true;
         }
         // Route other keys to the menubar when it's open.
-        if self.menubar.is_some() {
-            let mut mb = self.menubar.take().unwrap();
+        if let Some(mut mb) = self.menubar.take() {
             let consumed = mb.handle_key(key);
             if consumed {
                 // If the menubar dispatched a command, execute it.