Persist dock layout to profiles; dedupe port names; Channels-tab Create button

- Fix duplicated device names ("FT231X USB UART - FT231X USB UART (...)")
  — pyserial on Linux often reports the same udev model string twice for
  cheap FTDI/CH340-style adapters. Collapse it at the list_ports() source
  so every consumer (device auto-name, port picker) benefits.

- Save Control Panel / Namespace dock area, floating geometry, visibility,
  size and order to .labui profiles via QMainWindow.saveState()/
  restoreState(), round-tripped through the existing Profile.settings
  passthrough (self._settings) — no profile schema change needed.

- Channels tab: replace the per-row Signal ⊕ button (and its pinned/
  frozen-column overlay) with a single "Create Channel" button below the
  Namespace panel. Select one or more Signal/Channel rows (multi-select
  now supported) and click it — selected rows become the new Channel's
  sources, or an empty Channel is created if nothing's selected. Fixes a
  bug in the process: the multi/zero-source path defaulted to
  kind="expression" with no expression text, which fails to compile and
  silently dropped the channel; use kind="none" instead, which the user
  then edits in the Channels pane.

  NamespacePanel itself (ui/namespace_panel.py) goes back to a plain
  read-only reference widget — the create-channel button and its logic
  live entirely in ConfigWindow (config_window.py), so the shared
  dockable Namespace panel on the main window is unaffected.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

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