fix: display diff totals as plain status text

docs/configuration.md

@@ -172,7 +172,7 @@ Each segment's `title` is a literal template supporting only `{index}`, `{view}`
 
 `margin` adds unstyled space outside both edges of a segment, unlike the styled internal `padding`. `leading_margin` and `trailing_margin` override their respective sides. All accept integers from `0` through `64`; all margins default to zero. Explicit margins are additional to the renderer's one-column separator, so leave them at zero for normal inter-item spacing. Margins count toward anchor placement and collision handling; empty segments consume no margin, and margins yield along with padding and edges when only clipped content fits.
 
-`padding` adds spaces inside the segment's styling, on both sides of its title, and accepts integers from `0` through `64`. It defaults to `0` for plain-text and custom segments and `1` for tabs, mode, position, battery, diff totals, shell status, and LSP indicators. Internal padding is separate from the inter-item separator; explicit padding can deliberately add more whitespace. `leading_edge` and `trailing_edge` are separate styled glyph strings, not padding; `""` removes an edge. Tabs, diff totals, and shell status default to `"░▓"` / `"▓░"` edges; mode has only the trailing `"▓░"` edge, position and battery only the leading `"░▓"` edge, and other segments have none. `first_leading_edge` optionally overrides the first occurrence's leading glyphs: for tabs this is the actual first tab, not the first tab remaining after clipping; other segments have one occurrence. Tabs default this override to `""`, suppressing the first tab's left fade. Unicode widths are measured in terminal cells. Edge strings must be single-line and contain no control characters. Unknown style keys, invalid templates, and wrong types reject configuration.
+`padding` adds spaces inside the segment's styling, on both sides of its title, and accepts integers from `0` through `64`. It defaults to `0` for plain-text and custom segments and `1` for tabs, mode, position, battery, shell status, and LSP indicators. Diff totals use plain text without a filled background, padding, or edges by default. Internal padding is separate from the inter-item separator; explicit padding can deliberately add more whitespace. `leading_edge` and `trailing_edge` are separate styled glyph strings, not padding; `""` removes an edge. Tabs and shell status default to `"░▓"` / `"▓░"` edges; mode has only the trailing `"▓░"` edge, position and battery only the leading `"░▓"` edge, and other segments have none. `first_leading_edge` optionally overrides the first occurrence's leading glyphs: for tabs this is the actual first tab, not the first tab remaining after clipping; other segments have one occurrence. Tabs default this override to `""`, suppressing the first tab's left fade. Unicode widths are measured in terminal cells. Edge strings must be single-line and contain no control characters. Unknown style keys, invalid templates, and wrong types reject configuration.
 
 Any other segment name is a custom named value, such as `:build_status`. Set initial strings with `config.labels`; an empty value hides the custom segment, including its title override, margins, padding, and edges. Names match `[A-Za-z_][A-Za-z0-9_]*`. Labels are plain text: control characters are replaced rather than interpreted as terminal escapes. The same named value can appear in either bar.
 

src/chrome.rs

@@ -195,15 +195,15 @@ impl ChromeLine {
 
 fn default_segment(name: &str) -> SegmentConfig {
     let mut segment = SegmentConfig::default();
-    if matches!(name, "tabs" | "position" | "battery" | "shell" | "diff") {
+    if matches!(name, "tabs" | "position" | "battery" | "shell") {
         segment.leading_edge = "░▓".into();
     }
-    if matches!(name, "tabs" | "mode" | "shell" | "diff") {
+    if matches!(name, "tabs" | "mode" | "shell") {
         segment.trailing_edge = "▓░".into();
     }
     if matches!(
         name,
-        "tabs" | "mode" | "position" | "battery" | "shell" | "diff" | "lsp"
+        "tabs" | "mode" | "position" | "battery" | "shell" | "lsp"
     ) {
         segment.padding = 1;
     }

src/tui.rs

@@ -1823,7 +1823,7 @@ fn chrome_items<'a>(
             tab: None,
             accent: !matches!(
                 name.as_str(),
-                "path" | "language" | "diagnostics" | "selections" | "count" | "pending" | "buffer"
+                "path" | "language" | "diagnostics" | "selections" | "count" | "pending" | "buffer" | "diff"
             ),
             bold: false,
             first: true,

tests/unit/chrome.rs

@@ -79,7 +79,6 @@ fn omitted_options_inherit_and_explicit_groups_replace_defaults() {
 fn both_positions_accept_all_builtins_and_custom_styles() {
     let defaults = ChromeLine::top();
     assert_eq!(defaults.right, ["diff", "shell", "battery"]);
-    assert_eq!(defaults.segment("diff"), defaults.segment("shell"));
     let names = [
         "tabs",
         "mode",