Change /dump output to use g3 status formatting

Replace '📄 Context dumped to: <filename>' with 'g3: context dumped to <filename> [done]'
where g3: is bold green, filename is cyan, and [done] is bold green.

Add G3Status::complete_with_path() method for status messages with highlighted paths.

crates/g3-cli/src/commands.rs

@@ -196,7 +196,13 @@ pub async fn handle_command<W: UiWriter>(
             }
 
             match std::fs::write(&dump_path, &dump_content) {
-                Ok(_) => output.print(&format!("📄 Context dumped to: {}", dump_path.display())),
+                Ok(_) => {
+                    G3Status::complete_with_path(
+                        "context dumped to",
+                        &dump_path.display().to_string(),
+                        Status::Done,
+                    );
+                }
                 Err(e) => output.print(&format!("❌ Failed to write dump: {}", e)),
             }
             Ok(true)

crates/g3-cli/src/g3_status.rs

@@ -289,6 +289,23 @@ impl G3Status {
             Self::complete(&format!("{} ... {}%", scope_desc, result.before_percentage), Status::NoChanges);
         }
     }
+
+    /// Print a complete status message with a path highlighted in cyan.
+    /// Format: "g3: <message> <path> [status]"
+    /// - "g3:" is bold green
+    /// - path is cyan
+    /// - status is formatted per Status type
+    pub fn complete_with_path(message: &str, path: &str, status: Status) {
+        print!(
+            "{} {} {}{}{}",
+            Self::format_prefix(),
+            message,
+            SetForegroundColor(Color::Cyan),
+            path,
+            ResetColor
+        );
+        Self::status(&status);
+    }
 }
 
 #[cfg(test)]