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/storage.py

@@ -0,0 +1,48 @@
+import json
+import click
+from browser_cli.client import send_command, BrowserNotConnected
+from rich.console import Console
+
+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("storage")
+def storage_group():
+    """Read and write the page's localStorage / sessionStorage."""
+
+
+@storage_group.command("get")
+@click.argument("key", required=False)
+@click.option("--type", "store_type", type=click.Choice(["local", "session"]), default="local", show_default=True)
+@click.option("--tab", "tab_id", type=int, default=None, help="Tab ID (default: active tab)")
+def storage_get(key, store_type, tab_id):
+    """Get a localStorage KEY (or dump all keys if omitted)."""
+    result = _handle("storage.get", {"key": key, "type": store_type, "tabId": tab_id})
+    if result is None:
+        console.print("[dim]null[/dim]")
+    elif isinstance(result, dict):
+        console.print(json.dumps(result, indent=2))
+    else:
+        console.print(str(result))
+
+
+@storage_group.command("set")
+@click.argument("key")
+@click.argument("value")
+@click.option("--type", "store_type", type=click.Choice(["local", "session"]), default="local", show_default=True)
+@click.option("--tab", "tab_id", type=int, default=None, help="Tab ID (default: active tab)")
+def storage_set(key, value, store_type, tab_id):
+    """Set localStorage KEY to VALUE."""
+    _handle("storage.set", {"key": key, "value": value, "type": store_type, "tabId": tab_id})
+    console.print(f"[green]Set[/green] {store_type}[{key!r}] = {value!r}")