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/output.rs

@@ -209,6 +209,21 @@ pub fn print_response_with_opts(resp: &Response, action: Option<&str>, opts: &Ou
             );
         }
 
+        // `current`: the active tab's stable handle (#26).
+        if data
+            .get("current")
+            .and_then(|v| v.as_bool())
+            .unwrap_or(false)
+        {
+            let tid = data.get("tabId").and_then(|v| v.as_str()).unwrap_or("?");
+            let title = data.get("title").and_then(|v| v.as_str()).unwrap_or("");
+            let url = data.get("url").and_then(|v| v.as_str()).unwrap_or("");
+            let target = data.get("targetId").and_then(|v| v.as_str()).unwrap_or("");
+            println!("{} [{}] {} - {}", color::cyan("→"), tid, title, url);
+            println!("      {}", color::dim(&format!("target: {}", target)));
+            return;
+        }
+
         // Dialog status response
         if action == Some("dialog") {
             if let Some(has_dialog) = data.get("hasDialog").and_then(|v| v.as_bool()) {