fix: 4 bugs found during code review against PRD

- output_style: use MAGENTA color per PRD (was incorrectly DIM)
- vcs: pass project dir to jj exec (was None, causing wrong cwd)
- tools: singular "tool" when count is 1 (was always "tools")
- layout: wire up apply_formatting() in render pipeline (prefix,
  suffix, color override, pad, align were completely dead code)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/layout/mod.rs

@@ -2,7 +2,8 @@ pub mod flex;
 pub mod justify;
 pub mod priority;
 
-use crate::config::{Config, JustifyMode, LayoutValue};
+use crate::config::{Config, JustifyMode, LayoutValue, SectionBase};
+use crate::format;
 use crate::section::{self, RenderContext, SectionOutput};
 
 /// A section that survived priority drops and has rendered output.
@@ -64,11 +65,22 @@ fn render_line(section_ids: &[String], ctx: &RenderContext, separator: &str) ->
     let mut active: Vec<ActiveSection> = Vec::new();
 
     for id in section_ids {
-        if let Some(output) = section::render_section(id, ctx) {
+        if let Some(mut output) = section::render_section(id, ctx) {
             if output.raw.is_empty() && !section::is_spacer(id) {
                 continue;
             }
 
+            // Apply per-section formatting (prefix, suffix, color override, pad, align)
+            if let Some(base) = section_base(id, ctx.config) {
+                format::apply_formatting(
+                    &mut output.raw,
+                    &mut output.ansi,
+                    base,
+                    ctx.theme,
+                    &ctx.config.colors,
+                );
+            }
+
             let (prio, is_flex) = section_meta(id, ctx.config);
             active.push(ActiveSection {
                 id: id.clone(),
@@ -175,3 +187,35 @@ fn section_meta(id: &str, config: &Config) -> (u8, bool) {
         _ => (2, false), // custom sections default
     }
 }
+
+/// Look up the SectionBase for a given section ID.
+/// Returns None for spacers and unknown custom sections.
+fn section_base<'a>(id: &str, config: &'a Config) -> Option<&'a SectionBase> {
+    match id {
+        "model" => Some(&config.sections.model),
+        "provider" => Some(&config.sections.provider),
+        "project" => Some(&config.sections.project.base),
+        "vcs" => Some(&config.sections.vcs.base),
+        "beads" => Some(&config.sections.beads.base),
+        "context_bar" => Some(&config.sections.context_bar.base),
+        "context_usage" => Some(&config.sections.context_usage.base),
+        "context_remaining" => Some(&config.sections.context_remaining.base),
+        "tokens_raw" => Some(&config.sections.tokens_raw.base),
+        "cache_efficiency" => Some(&config.sections.cache_efficiency),
+        "cost" => Some(&config.sections.cost.base),
+        "cost_velocity" => Some(&config.sections.cost_velocity),
+        "token_velocity" => Some(&config.sections.token_velocity),
+        "cost_trend" => Some(&config.sections.cost_trend.base),
+        "context_trend" => Some(&config.sections.context_trend.base),
+        "lines_changed" => Some(&config.sections.lines_changed),
+        "duration" => Some(&config.sections.duration),
+        "tools" => Some(&config.sections.tools.base),
+        "turns" => Some(&config.sections.turns.base),
+        "load" => Some(&config.sections.load.base),
+        "version" => Some(&config.sections.version),
+        "time" => Some(&config.sections.time.base),
+        "output_style" => Some(&config.sections.output_style),
+        "hostname" => Some(&config.sections.hostname),
+        _ => None,
+    }
+}

src/section/output_style.rs

@@ -10,7 +10,7 @@ pub fn render(ctx: &RenderContext) -> Option<SectionOutput> {
     let raw = style_name.to_string();
 
     let ansi = if ctx.color_enabled {
-        format!("{}{raw}{}", color::DIM, color::RESET)
+        format!("{}{raw}{}", color::MAGENTA, color::RESET)
     } else {
         raw.clone()
     };

src/section/tools.rs

@@ -22,7 +22,8 @@ pub fn render(ctx: &RenderContext) -> Option<SectionOutput> {
         String::new()
     };
 
-    let raw = format!("{count} tools{last}");
+    let label = if count == 1 { "tool" } else { "tools" };
+    let raw = format!("{count} {label}{last}");
     let ansi = if ctx.color_enabled {
         format!("{}{raw}{}", color::DIM, color::RESET)
     } else {

src/section/vcs.rs

@@ -128,7 +128,7 @@ fn render_git(
 
 fn render_jj(
     ctx: &RenderContext,
-    _dir: &str,
+    dir: &str,
     ttl: &crate::config::VcsTtl,
     glyphs: &crate::config::GlyphConfig,
 ) -> Option<SectionOutput> {
@@ -147,7 +147,7 @@ fn render_jj(
                 "if(bookmarks, bookmarks.join(\",\"), change_id.shortest(8))",
                 "--color=never",
             ],
-            None,
+            Some(dir),
             timeout,
         )?;
         ctx.cache.set("vcs_branch", &out);