fix: new clippy ci errors

src/app/text_copy.rs

@@ -239,13 +239,13 @@ impl App {
 
         let mut text = String::new();
         let mut ranges = Vec::new();
-        for idx in start..=end {
+        for (idx, line) in self.lines.iter().enumerate().take(end + 1).skip(start) {
             let clusters = match cell {
-                Some(cell) => match table_cell_clusters(line_clusters(&self.lines[idx]), cell) {
+                Some(cell) => match table_cell_clusters(line_clusters(line), cell) {
                     Some(clusters) => clusters,
                     None => continue,
                 },
-                None => line_clusters(&self.lines[idx]),
+                None => line_clusters(line),
             };
             let Some(first) = clusters.iter().position(|c| !is_strippable(c)) else {
                 continue;

src/cli.rs

@@ -55,11 +55,7 @@ pub(crate) struct CliOptions {
 }
 
 pub(crate) fn is_diff_spec(value: &str) -> bool {
-    if value.is_empty() || value.starts_with('-') {
-        return false;
-    }
-
-    true
+    !(value.is_empty() || value.starts_with('-'))
 }
 
 pub(crate) fn parse_diff_spec(value: &str) -> Result<DiffSpec> {

src/tests/render.rs

@@ -303,9 +303,9 @@ fn trailing_blank_context_lines_are_trimmed() {
         "Add row must be emitted"
     );
 
-    for i in (header_idx + 3)..built.lines.len() {
+    for line in &built.lines[header_idx + 3..] {
         assert_ne!(
-            line_text(&built.lines[i]),
+            line_text(line),
             "│  ",
             "no trailing blank context body rows must survive the trim"
         );
@@ -331,9 +331,9 @@ fn both_leading_and_trailing_blanks_trimmed() {
         "content Add row must be emitted"
     );
 
-    for i in (header_idx + 3)..built.lines.len() {
+    for line in &built.lines[header_idx + 3..] {
         assert_ne!(
-            line_text(&built.lines[i]),
+            line_text(line),
             "│  ",
             "no blank context body rows must survive when both trims apply"
         );