refactor: modularize auth transport and markdown

- Split auth into focused package modules for agent keys, file keys,
  signing, and post-quantum transport helpers while keeping the public
  browser_cli.auth import surface intact.
- Move transport encoding internals into a package with separate codec and
  binary-hoisting helpers, preserving browser_cli.transport compatibility.
- Extract remote TCP auth/socket helpers and serve challenge setup out of the
  runtime paths to make connection handling easier to reason about.
- Move the extension markdown extractor into a dedicated content/markdown
  folder with separate root selection, code normalization, renderer, and utils.
- Centralize CLI Rich rendering helpers for tab/window tree and table output,
  and add rendering tests for the shared builders.
- Remove local typing ignores in SDK/decorator/script plumbing and bump the
  package and extension version to 0.15.3.

browser_cli/commands/tabs.py

@@ -2,65 +2,25 @@ import base64
 import binascii
 import click
 from browser_cli.commands import client_from_ctx, gentle_mode_option, handle_errors, print_counts, tab_option
-from browser_cli.commands.rendering import no_wrap_text, print_tree, shorten, tab_tree_label, tree_title_limit, tree_url_limit
+from browser_cli.commands.rendering import build_tabs_tree, print_table_rows, print_tree
 from rich.console import Console
 from rich.table import Table
-from rich.text import Text
-from rich.tree import Tree
 
 console = Console()
 
-def _group_tree_label(group_id: int, group, *, title_limit: int) -> Text:
-  title = getattr(group, "title", "") or f"Group {group_id}"
-  color = getattr(group, "color", "") or "group"
-  count = getattr(group, "tab_count", 0) or 0
-  collapsed = bool(getattr(group, "collapsed", False))
-  label = no_wrap_text()
-  label.append(shorten(title, title_limit), style="bold")
-  meta = [color]
-  if count:
-    meta.append(f"{count} tab" + ("" if count == 1 else "s"))
-  if collapsed:
-    meta.append("collapsed")
-  label.append(" (" + ", ".join(meta) + ")", style="dim")
-  return label
-
-def _tab_sort_key(tab):
-  return (
-    tab.browser or "",
-    tab.window_id,
-    getattr(tab, "index", 0),
-    tab.group_id if tab.group_id is not None else -1,
-    tab.id,
-  )
-
 def _print_tabs(tabs, *, show_browser: bool = False) -> None:
-  if not tabs:
-    console.print("[yellow]No tabs found[/yellow]")
-    return
-  table = Table(show_header=True, header_style="bold cyan")
+  columns = []
   if show_browser:
-    table.add_column("Browser", no_wrap=True)
-  table.add_column("ID", style="dim", no_wrap=True)
-  table.add_column("Window", no_wrap=True)
-  table.add_column("Active", width=7)
-  table.add_column("Muted", width=7)
-  table.add_column("Title")
-  table.add_column("URL")
-  for t in tabs:
-    active = "[green]✓[/green]" if t.active else ""
-    muted = "[yellow]✓[/yellow]" if t.muted else ""
-    row = [
-      (t.browser or "") if show_browser else None,
-      str(t.id),
-      str(t.window_id),
-      active,
-      muted,
-      (t.title or "")[:60],
-      (t.url or "")[:80],
-    ]
-    table.add_row(*[value for value in row if value is not None])
-  console.print(table)
+    columns.append(("Browser", lambda tab: tab.browser or ""))
+  columns.extend([
+    ("ID", lambda tab: tab.id),
+    ("Window", lambda tab: tab.window_id),
+    ("Active", lambda tab: "[green]✓[/green]" if tab.active else ""),
+    ("Muted", lambda tab: "[yellow]✓[/yellow]" if tab.muted else ""),
+    ("Title", lambda tab: (tab.title or "")[:60]),
+    ("URL", lambda tab: (tab.url or "")[:80]),
+  ])
+  print_table_rows(tabs, columns, console=console, empty_message="[yellow]No tabs found[/yellow]")
 
 @click.group("tabs")
 def tabs_group():
@@ -79,39 +39,7 @@ def tabs_list():
 def tabs_tree(show_urls):
   """Show tabs grouped as a window/group tree."""
   client = client_from_ctx()
-  tabs = sorted(client.tabs.list(), key=_tab_sort_key)
-  title_limit = tree_title_limit(console=console, show_browser=any(t.browser for t in tabs), show_urls=show_urls)
-  url_limit = tree_url_limit(title_limit, console=console)
-  group_info = {
-    (group.browser or "local", group.id): group
-    for group in client.groups.list()
-  }
-  root = Tree("[bold]Tabs[/bold]")
-  browsers = {}
-  windows = {}
-  groups = {}
-  show_browser = any(t.browser for t in tabs)
-  for tab in tabs:
-    browser_key = tab.browser or "local"
-    browser_node = browsers.get(browser_key)
-    if browser_node is None:
-      browser_node = root.add(Text(browser_key, style="bold cyan")) if show_browser else root
-      browsers[browser_key] = browser_node
-    win_key = (browser_key, tab.window_id)
-    win_node = windows.get(win_key)
-    if win_node is None:
-      win_node = browser_node.add(f"Window {tab.window_id}")
-      windows[win_key] = win_node
-    if tab.group_id is None:
-      win_node.add(tab_tree_label(tab, title_limit=title_limit, show_urls=show_urls, url_limit=url_limit))
-      continue
-    group_key = (browser_key, tab.window_id, tab.group_id)
-    group_node = groups.get(group_key)
-    group = group_info.get((browser_key, tab.group_id))
-    if group_node is None:
-      group_node = win_node.add(_group_tree_label(tab.group_id, group, title_limit=title_limit))
-      groups[group_key] = group_node
-    group_node.add(tab_tree_label(tab, title_limit=title_limit, show_urls=show_urls, url_limit=url_limit))
+  root = build_tabs_tree(client.tabs.list(), client.groups.list(), console=console, show_urls=show_urls)
   print_tree(root, console=console)
 
 @tabs_group.command("close")