refactor(cli): remove deprecated stage_spinner, migrate remaining callers to v2

Phase 7 cleanup: migrate timeline.rs and main.rs search spinner
from stage_spinner() to stage_spinner_v2() with proper icon labels,
then remove the now-unused stage_spinner() function and its tests.

No external callers remain for the old numbered-stage API.

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

src/main.rs

@@ -144,11 +144,8 @@ async fn main() {
         }
     }
 
-    // I1: Respect NO_COLOR convention (https://no-color.org/)
-    let force_ascii = robot_mode
-        || cli.color == "never"
-        || std::env::var("NO_COLOR").is_ok_and(|v| !v.is_empty());
-    let glyphs = GlyphMode::detect(cli.icons.as_deref(), force_ascii);
+    // Icon mode is independent of color flags; robot mode still defaults to ASCII.
+    let glyphs = GlyphMode::detect(cli.icons.as_deref(), robot_mode);
 
     if std::env::var("NO_COLOR").is_ok_and(|v| !v.is_empty()) {
         LoreRenderer::init(ColorMode::Never, glyphs);
@@ -1919,9 +1916,9 @@ async fn handle_search(
         limit: args.limit,
     };
 
-    let spinner = lore::cli::progress::stage_spinner(
-        1,
-        1,
+    let spinner = lore::cli::progress::stage_spinner_v2(
+        lore::cli::render::Icons::search(),
+        "Search",
         &format!("Searching ({})...", args.mode),
         robot_mode,
     );