W55: Shift-F3 raw viewer (MC parity)

MC's Shift-F3 opens the viewer in raw mode without magic/binary
detection. Add Cmd::ViewRaw variant bound to Shift-F3, dispatch
handler, and open_viewer_raw_for_cursor() method that opens the
viewer with magic_mode=false.

This is the standard MC behaviour for viewing binary files as
raw text when magic detection incorrectly identifies them.

Tests: 1416 pass, zero warnings.

local/recipes/tui/tlc/source/src/filemanager/dialog_ops.rs

@@ -356,6 +356,29 @@ impl FileManager {
         Ok(())
     }
 
+    /// Open the viewer in raw mode (no magic/binary detection). MC
+    /// parity for Shift-F3. The viewer forces Text mode regardless of
+    /// file content.
+    pub fn open_viewer_raw_for_cursor(&mut self) -> Result<()> {
+        let p = self.active_panel().cursor_path();
+        if p.as_os_str().is_empty() {
+            self.status.set_message("view: no path selected");
+            return Ok(());
+        }
+        match crate::viewer::Viewer::open(&p) {
+            Ok(mut v) => {
+                v.magic_mode = false;
+                let _ = v.restore_cursor_position();
+                self.viewer = Some(v);
+                self.status.set_message(format!("Viewing {} (raw)", p.display()));
+            }
+            Err(e) => {
+                self.status.set_message(format!("view: {e}"));
+            }
+        }
+        Ok(())
+    }
+
     /// Open the M-? Find dialog. The pattern input is pre-filled with
     /// the cursor entry's name (so searching for the selected file's
     /// pattern is the default); falls back to the default placeholder

local/recipes/tui/tlc/source/src/filemanager/dispatch.rs

@@ -109,6 +109,10 @@ impl FileManager {
                 self.open_viewer_for_cursor()?;
                 Ok(true)
             }
+            Cmd::ViewRaw => {
+                self.open_viewer_raw_for_cursor()?;
+                Ok(true)
+            }
             Cmd::UserMenu => {
                 self.open_user_menu_dialog()?;
                 Ok(true)

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

@@ -11,6 +11,8 @@ pub enum Cmd {
     Edit,
     /// F3 — open the file under the cursor in the viewer.
     View,
+    /// Shift-F3 — view the cursor file in raw mode (no magic detection).
+    ViewRaw,
     /// Descend into the directory under the cursor (or open a file).
     /// If the cursor is on a directory, change into it. If on a
     /// regular file, route to Edit. This is the historical "ENTER
@@ -315,6 +317,7 @@ impl Cmd {
             Cmd::EditMenuFile => "Edit menu file",
             Cmd::EditHighlightFile => "Edit highlighting file",
             Cmd::ViewFile => "View file",
+            Cmd::ViewRaw => "View raw file",
             Cmd::DisplayBits => "Display bits",
             Cmd::LearnKeysDialog => "Learn keys",
             Cmd::VfsSettings => "Virtual FS",
@@ -441,6 +444,10 @@ pub fn default_keymap() -> Keymap {
     km.bind(F1, Cmd::Help);
     km.bind(F2, Cmd::UserMenu);
     km.bind(F3, Cmd::View);
+    km.bind(Key {
+        code: F3.code,
+        mods: crate::key::Modifiers::SHIFT,
+    }, Cmd::ViewRaw);
     km.bind(F4, Cmd::Edit);
     km.bind(F5, Cmd::Copy);
     km.bind(F6, Cmd::Move);