W65: Search whole-words option (MC search dialog parity)

Add search_whole_words toggle to the viewer. When enabled, the
search pattern is wrapped in \b boundaries to match only whole
words. Accessible via Search F9 menu → Whole words.

- Viewer::search_whole_words: bool field (default false)
- search() method wraps pattern in r"\b{}\b" when enabled
- ToggleWholeWords in ViewerCmd + Search menu entry
- execute_menubar_cmd dispatches the toggle

Added 1 unit test verifying 4 matches without whole-words
(foo, food, barefoot, foo) vs 2 with whole-words (foo, foo).

Tests: 1424 pass (was 1423), zero warnings.

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

@@ -38,6 +38,8 @@ pub enum ViewerCmd {
     ToggleRuler,
     /// Toggle hex column navigation (hex↔ASCII text column).
     ToggleHexNavigation,
+    /// Toggle whole-word search.
+    ToggleWholeWords,
     /// Search forward.
     Search,
     /// Search next.
@@ -166,6 +168,8 @@ impl ViewerMenuBar {
                     MenuItem::item("Find...", 'f', ViewerCmd::Search),
                     MenuItem::item("Find next", 'n', ViewerCmd::SearchNext),
                     MenuItem::item("Find prev", 'p', ViewerCmd::SearchPrev),
+                    MenuItem::separator(),
+                    MenuItem::item("Whole words", 'w', ViewerCmd::ToggleWholeWords),
                 ],
             ),
             Menu::new(

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

@@ -104,6 +104,9 @@ pub struct Viewer {
     marker: usize,
     /// Last search direction (true = forward / 'n', false = backward / 'N').
     last_search_forward: bool,
+    /// If true, wrap the search pattern in \b boundaries to match
+    /// whole words only. Toggled via the search options.
+    pub search_whole_words: bool,
     /// Whether to show the column ruler (MC CK_Ruler / Alt-R).
     pub ruler: bool,
     /// True when the cursor navigates the ASCII text column in
@@ -190,6 +193,7 @@ impl Viewer {
             marks: [None; 10],
             marker: 0,
             last_search_forward: true,
+            search_whole_words: false,
             ruler: false,
             hexview_in_text: false,
             nroff_enabled: false,
@@ -237,6 +241,7 @@ impl Viewer {
             marks: [None; 10],
             marker: 0,
             last_search_forward: true,
+            search_whole_words: false,
             ruler: false,
             hexview_in_text: false,
             nroff_enabled: false,
@@ -372,22 +377,27 @@ impl Viewer {
     }
 
     /// Run a search and update the engine. Returns the number of hits.
-    pub fn search(&mut self, pattern: &str, case_insensitive: bool) -> Result<usize> {
+    pub fn search(&mut self, raw_pattern: &str, case_insensitive: bool) -> Result<usize> {
+        let pattern = if self.search_whole_words {
+            format!(r"\b{}\b", raw_pattern)
+        } else {
+            raw_pattern.to_string()
+        };
         match &self.source {
             source::FileSource::Inline { bytes } => {
                 let text = String::from_utf8_lossy(bytes);
-                self.search.find_all(&text, pattern, case_insensitive)?;
+                self.search.find_all(&text, &pattern, case_insensitive)?;
             }
             source::FileSource::Compressed { bytes, .. } => {
                 let text = String::from_utf8_lossy(bytes);
-                self.search.find_all(&text, pattern, case_insensitive)?;
+                self.search.find_all(&text, &pattern, case_insensitive)?;
             }
             source::FileSource::Chunked { .. } => {
                 let size = self.source.size();
                 let mut offset = 0u64;
                 let chunk_size = source::CHUNK_SIZE as u64;
                 self.search.find_all_streaming(
-                    pattern,
+                    &pattern,
                     case_insensitive,
                     || -> Result<Option<(Vec<u8>, bool)>, anyhow::Error> {
                         if offset >= size {
@@ -1223,6 +1233,9 @@ impl Viewer {
             ViewerCmd::ToggleHexNavigation => {
                 self.hexview_in_text = !self.hexview_in_text;
             }
+            ViewerCmd::ToggleWholeWords => {
+                self.search_whole_words = !self.search_whole_words;
+            }
             ViewerCmd::Search => {
                 self.prompt = Some(ViewerPrompt::Search);
                 self.prompt_input.clear();
@@ -1999,6 +2012,19 @@ mod tests {
         assert!(!v.hexview_in_text);
     }
 
+    #[test]
+    fn whole_words_search_matches_boundaries() {
+        let p = make_text("wsearch.txt", b"foo bar food barefoot foo");
+        let mut v = Viewer::open(&p).unwrap();
+        // Without whole-words: "foo" should match in "food" and "barefoot"
+        let n = v.search("foo", false).unwrap();
+        assert_eq!(n, 4); // foo, food, barefoot, foo
+        // With whole-words: "foo" should only match standalone "foo"
+        v.search_whole_words = true;
+        let n = v.search("foo", false).unwrap();
+        assert_eq!(n, 2); // only standalone "foo" entries
+    }
+
     fn k(c: char) -> Key {
         Key { code: c as u32, mods: crate::key::Modifiers::empty() }
     }