feat: add browser automation commands (v0.6.0)

Navigation: open-wait (open + block until loaded)
DOM: key, hover, check/uncheck, clear, focus, submit, poll, scroll, select, eval, wait-for
Tabs: pin/unpin, screenshot, watch-url (block until URL matches regex)
New command groups: page info, storage get/set, cookies list/get/set
Extension: add cookies permission

browser_cli/commands/page.py

@@ -0,0 +1,38 @@
+import click
+from browser_cli.client import send_command, BrowserNotConnected
+from rich.console import Console
+from rich.table import Table
+
+console = Console()
+
+
+def _handle(command, args=None):
+    try:
+        return send_command(command, args or {})
+    except BrowserNotConnected as e:
+        console.print(f"[red]Error:[/red] {e}")
+        raise SystemExit(1)
+    except RuntimeError as e:
+        console.print(f"[red]Browser error:[/red] {e}")
+        raise SystemExit(1)
+
+
+@click.group("page")
+def page_group():
+    """Inspect current page metadata."""
+
+
+@page_group.command("info")
+def page_info():
+    """Show title, URL, readyState, language, and meta tags of the active tab."""
+    info = _handle("page.info") or {}
+    table = Table(show_header=False)
+    table.add_column("Field", style="bold cyan", no_wrap=True)
+    table.add_column("Value")
+    table.add_row("Title",      info.get("title") or "")
+    table.add_row("URL",        info.get("url") or "")
+    table.add_row("Ready",      info.get("readyState") or "")
+    table.add_row("Lang",       info.get("lang") or "")
+    for key, val in (info.get("meta") or {}).items():
+        table.add_row(f"meta:{key}", val)
+    console.print(table)