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/drift.rs

@@ -4,7 +4,7 @@ use std::sync::LazyLock;
 use regex::Regex;
 use serde::Serialize;
 
-use crate::cli::render::Theme;
+use crate::cli::render::{Icons, Theme};
 use crate::cli::robot::RobotMeta;
 use crate::core::config::Config;
 use crate::core::db::create_connection;
@@ -428,7 +428,11 @@ pub fn print_drift_human(response: &DriftResponse) {
     println!();
 
     if response.drift_detected {
-        println!("{}", Theme::error().bold().render("DRIFT DETECTED"));
+        println!(
+            "{}  {}",
+            Theme::error().render(Icons::error()),
+            Theme::error().bold().render("DRIFT DETECTED")
+        );
         if let Some(dp) = &response.drift_point {
             println!(
                 "  At note #{} by @{} ({}) - similarity {:.2}",
@@ -439,7 +443,11 @@ pub fn print_drift_human(response: &DriftResponse) {
             println!("  Topics:  {}", response.drift_topics.join(", "));
         }
     } else {
-        println!("{}", Theme::success().render("No drift detected"));
+        println!(
+            "{}  {}",
+            Theme::success().render(Icons::success()),
+            Theme::success().render("No drift detected")
+        );
     }
 
     println!();
@@ -450,7 +458,7 @@ pub fn print_drift_human(response: &DriftResponse) {
         println!("{}", Theme::bold().render("Similarity Curve:"));
         for pt in &response.similarity_curve {
             let bar_len = ((pt.similarity.max(0.0)) * 30.0) as usize;
-            let bar: String = "#".repeat(bar_len);
+            let bar: String = "\u{2588}".repeat(bar_len);
             println!(
                 "  {:>3}  {:.2}  {}  @{}",
                 pt.note_index, pt.similarity, bar, pt.author