Sync codex-desktop-linux with v0.4.2 release content

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v0.4.2 released. Update codex-desktop-linux to pin/ship this version and mirror the relevant changes.

v0.4.2 changelog

Fixed

• X11 keyboard input now goes through xdotool (XTEST) instead of ydotool.
  ydotool injects raw evdev scancodes into a virtual uinput device, which X11
  re-interprets through the active XKB layout — so press_key "Return" and
  chords like ctrl+a landed as stray characters, and type_text mangled
  symbols and digits (_ → %, 1 → +) even on a plain US layout. XTEST
  resolves keysyms against the live layout. Wayland behaviour is unchanged, and
  the ydotool path remains the fallback when xdotool is missing or fails.
  doctor now reports an xdotool input backend on X11. Override with
  COMPUTER_USE_LINUX_FORCE_YDOTOOL_KEYBOARD=1 (opt out) or
  COMPUTER_USE_LINUX_FORCE_XDOTOOL_KEYBOARD=1 (force on). (press_key emits stray characters instead of key events on X11 (named keys and modifier chords broken) #58)
• Portal scroll direction on KDE Plasma Wayland: vertical discrete axis steps
  are inverted for the xdg-desktop-portal-kde discrete path so direction: "up"|"down" matches viewport motion. ydotool / REL_WHEEL polarity is
  unchanged. Override with COMPUTER_USE_LINUX_PORTAL_SCROLL_INVERT=0|1. (Scroll direction is inverted on KDE Plasma Wayland #56)

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