fix(fill/tabs): dispatch real input/change/blur (#25); close <tab> wording + chrome-use current (#26)

#25 — fill() didn't fire the events framework inputs / site autocomplete need:
it set value directly (bypassing React's value-tracker) and typed via
Input.insertText, so controlled components and input/change/blur listeners (e.g.
Mercari's postal-code → 都道府県 lookup) never ran though the value showed. fill
now emulates a real edit: focus, set through the element's prototype value setter
(React _valueTracker registers), then dispatch input → input → change → blur/
focusout. SELECT and contenteditable handled too. type <sel> <text> remains for
per-keystroke sites. Verified live: an input wired with input/change/blur fired
'IICB' from one fill.

#26 (ergonomics):
- 'close <tab>' now closes just that tab and prints 'Tab [tN] closed'; bare
  'close' still closes the browser. Previously 'close t12' ran a browser close
  and alarmingly printed 'Browser closed'.
- new 'chrome-use current': prints the active tab's stable handle (tabId + CDP
  targetId + url/title), refreshed live — so an agent holds the targetId (which
  survives cross-process nav) instead of re-deriving 'which tab is live' from
  'tabs' every step. The deeper tab-id churn is the #21/#23 stable-targetId story.

Tests cover fill events (live), close tab-vs-browser parse, and current.

cli/src/commands.rs

@@ -1026,7 +1026,22 @@ fn parse_command_inner(args: &[String], flags: &Flags) -> Result<Value, ParseErr
         }
 
         // === Close ===
-        "close" | "quit" | "exit" => Ok(json!({ "id": id, "action": "close" })),
+        "close" | "quit" | "exit" => {
+            // `close <tab>` closes only that tab (and the output says "Tab
+            // closed"); bare `close` closes the browser/session. `close --all` is
+            // intercepted earlier in the dispatcher. Previously `close t12` still
+            // ran a browser close and alarmingly printed "Browser closed" (#26).
+            if let Some(tab_ref) = rest.iter().find(|a| !a.starts_with("--")) {
+                Ok(json!({ "id": id, "action": "tab_close", "tabId": tab_ref }))
+            } else {
+                Ok(json!({ "id": id, "action": "close" }))
+            }
+        }
+
+        // The active tab's stable handle — `targetId` survives cross-process
+        // navigation and is reusable across sessions, so an agent can hold it
+        // instead of re-deriving "which tab is live" from `tabs` each step (#26).
+        "current" => Ok(json!({ "id": id, "action": "current" })),
 
         // === Inspect ===
         "inspect" => Ok(json!({ "id": id, "action": "inspect" })),
@@ -4014,6 +4029,28 @@ mod tests {
         assert_eq!(cmd["tabId"], "docs");
     }
 
+    #[test]
+    fn test_close_tab_vs_browser() {
+        // `close <tab>` closes that tab (says "Tab closed"); bare `close` closes
+        // the browser (#26).
+        let tab = parse_command(&args("close t12"), &default_flags()).unwrap();
+        assert_eq!(tab["action"], "tab_close");
+        assert_eq!(tab["tabId"], "t12");
+        let browser = parse_command(&args("close"), &default_flags()).unwrap();
+        assert_eq!(browser["action"], "close");
+        // `quit`/`exit` aliases still browser-close.
+        assert_eq!(
+            parse_command(&args("quit"), &default_flags()).unwrap()["action"],
+            "close"
+        );
+    }
+
+    #[test]
+    fn test_current_command() {
+        let cmd = parse_command(&args("current"), &default_flags()).unwrap();
+        assert_eq!(cmd["action"], "current");
+    }
+
     #[test]
     fn test_tab_sends_string_tab_id() {
         let cmd = parse_command(&args("tab t2"), &default_flags()).unwrap();