refactor(cli): polish secondary commands with icons, number formatting, and section dividers

Phase 6 of the UX overhaul. Applies consistent visual treatment across
the remaining command outputs: stats, doctor, timeline, who, count,
and drift.

Stats (stats.rs):
- Apply render::format_number() to all numeric values (documents,
  FTS indexed, embedding counts, chunks) for thousand-separator
  formatting in large databases

Doctor (doctor.rs):
- Replace Unicode check/warning/cross symbols with Icons::success(),
  Icons::warning(), Icons::error() for glyph-mode awareness
- Add summary line after checks showing "Ready/Not ready" with counts
  of passed, warnings, and failed checks separated by middle dots
- Remove "lore doctor" title header for cleaner output

Count (count.rs):
- Right-align numeric values with {:>10} format for columnar output
  in count and state breakdown displays

Timeline (timeline.rs):
- Add entity icons (issue/MR) before entity references in event rows
- Refactor format_event_tag to pad plain text before applying style,
  preventing ANSI codes from breaking column alignment
- Extract style_padded() helper for width-then-style pattern

Who (who.rs):
- Add Icons::user() before usernames in expert, workload, reviews,
  and overlap displays
- Replace manual bold section headers with render::section_divider()
  in workload view (Assigned Issues, Authored MRs, Reviewing MRs,
  Unresolved Discussions)

Drift (drift.rs):
- Add Icons::error()/success() before drift detection status line
- Replace '#' bar character with Unicode full block for similarity
  curve visualization

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

src/cli/commands/who.rs

@@ -1,4 +1,4 @@
-use crate::cli::render::{self, Theme};
+use crate::cli::render::{self, Icons, Theme};
 use rusqlite::Connection;
 use serde::Serialize;
 use std::collections::{HashMap, HashSet};
@@ -1951,7 +1951,7 @@ fn print_expert_human(r: &ExpertResult, project_path: Option<&str>) {
         };
         println!(
             "  {:<16} {:>6} {:>12} {:>6} {:>12}  {:<12}{}{}",
-            Theme::info().render(&format!("@{}", expert.username)),
+            Theme::info().render(&format!("{} {}", Icons::user(), expert.username)),
             expert.score,
             reviews,
             notes,
@@ -2004,16 +2004,18 @@ fn print_workload_human(r: &WorkloadResult) {
     println!();
     println!(
         "{}",
-        Theme::bold().render(&format!("@{} -- Workload Summary", r.username))
+        Theme::bold().render(&format!(
+            "{} {} -- Workload Summary",
+            Icons::user(),
+            r.username
+        ))
     );
     println!("{}", "\u{2500}".repeat(60));
 
     if !r.assigned_issues.is_empty() {
-        println!();
         println!(
-            "  {} ({})",
-            Theme::bold().render("Assigned Issues"),
-            r.assigned_issues.len()
+            "{}",
+            render::section_divider(&format!("Assigned Issues ({})", r.assigned_issues.len()))
         );
         for item in &r.assigned_issues {
             println!(
@@ -2032,11 +2034,9 @@ fn print_workload_human(r: &WorkloadResult) {
     }
 
     if !r.authored_mrs.is_empty() {
-        println!();
         println!(
-            "  {} ({})",
-            Theme::bold().render("Authored MRs"),
-            r.authored_mrs.len()
+            "{}",
+            render::section_divider(&format!("Authored MRs ({})", r.authored_mrs.len()))
         );
         for mr in &r.authored_mrs {
             let draft = if mr.draft { " [draft]" } else { "" };
@@ -2057,11 +2057,9 @@ fn print_workload_human(r: &WorkloadResult) {
     }
 
     if !r.reviewing_mrs.is_empty() {
-        println!();
         println!(
-            "  {} ({})",
-            Theme::bold().render("Reviewing MRs"),
-            r.reviewing_mrs.len()
+            "{}",
+            render::section_divider(&format!("Reviewing MRs ({})", r.reviewing_mrs.len()))
         );
         for mr in &r.reviewing_mrs {
             let author = mr
@@ -2086,11 +2084,12 @@ fn print_workload_human(r: &WorkloadResult) {
     }
 
     if !r.unresolved_discussions.is_empty() {
-        println!();
         println!(
-            "  {} ({})",
-            Theme::bold().render("Unresolved Discussions"),
-            r.unresolved_discussions.len()
+            "{}",
+            render::section_divider(&format!(
+                "Unresolved Discussions ({})",
+                r.unresolved_discussions.len()
+            ))
         );
         for disc in &r.unresolved_discussions {
             println!(
@@ -2128,7 +2127,11 @@ fn print_reviews_human(r: &ReviewsResult) {
     println!();
     println!(
         "{}",
-        Theme::bold().render(&format!("@{} -- Review Patterns", r.username))
+        Theme::bold().render(&format!(
+            "{} {} -- Review Patterns",
+            Icons::user(),
+            r.username
+        ))
     );
     println!("{}", "\u{2500}".repeat(60));
     println!();
@@ -2289,7 +2292,7 @@ fn print_overlap_human(r: &OverlapResult, project_path: Option<&str>) {
 
         println!(
             "  {:<16} {:<6} {:>7}  {:<12}  {}{}",
-            Theme::info().render(&format!("@{}", user.username)),
+            Theme::info().render(&format!("{} {}", Icons::user(), user.username)),
             format_overlap_role(user),
             user.touch_count,
             render::format_relative_time(user.last_seen_at),