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/native/browser.rs

@@ -1263,6 +1263,22 @@ impl BrowserManager {
             .collect()
     }
 
+    /// The active tab's stable handle + current location, for `chrome-use
+    /// current` (#26). `targetId` survives cross-process navigation, so it's the
+    /// handle an agent should hold across a multi-step flow.
+    pub fn active_page_info(&self) -> Option<Value> {
+        let i = self.resolved_active_index();
+        self.pages.get(i).map(|p| {
+            json!({
+                "tabId": format_tab_id(p.tab_id),
+                "targetId": p.target_id,
+                "label": p.label,
+                "url": p.url,
+                "title": p.title,
+            })
+        })
+    }
+
     /// Stable `tab_id` for a page identified by its CDP `targetId`, if tracked.
     /// Lets callers adopt a tab by the cross-session-stable target id.
     pub fn tab_id_for_target(&self, target_id: &str) -> Option<u32> {