Pre-defined Steam launch options: picker menu

[Leb-Sun]

Games with multiple Steam launch entries (Play DX11 / DX12, safe mode, mod
launcher…) always booted the default one. This adds a "Launch Options" item to
the STEAM dropdown on both game screens — only shown when the game actually has
2+ entries — opening a Workshop-style picker (WsBg scheme, pane-nav wired).
Tapping a row saves it as the game's default.

The selection persists on the shortcut (launch_exe_path + new
launch_exe_args extra) and the entry's args ride the existing
SteamLaunchOptions %command% pipeline from #520: env prefix stays on the env
path, selected args expand at %command%, user args after it follow, join-connect
still appends last. Covers ColdClient, Goldberg and the Steam Launcher;
localconfig LaunchOptions / setLaunchCommandLine keep getting the raw spliced
template as before, and the steam-env stamp now includes the effective line so
switching options re-runs the localconfig edit.

Also fixes the Steam Launcher dropping game args in direct-exe mode:
wn-steam-launcher read only argv[1] and CreateProcess'd the bare exe, so
anything after the game path never reached the game. It now forwards argv[2..]
(steam.exe asset rebuilt from source). Verified on device on both the ColdClient
and Steam Launcher paths.

LaunchInfo gains an arguments field parsed from appinfo config.launch (stale
cached rows heal via a one-shot PICS re-fetch). A selection that carries args
also forces direct-exe mode — LaunchApp would start Steam's default entry and
ignore (or double) the picked one when both entries share the same exe. Adds
store_game_launch_options, store_game_launch_option_failed and
store_game_launch_options_count in all locales.

Review + testing hardening: the direct-exe override now compares the full relative
path (entries differing only by directory were silently ignored) and re-selecting
Steam's default entry clears the args override so launches return to LaunchApp. The
picker's selection is explicit state (launch_option_exe/launch_option_args
extras): untouched shortcuts show the default entry as active, a manual exe change
in shortcut settings turns options off entirely (a custom exe is never adopted as a
launch option), and a read-only hint under Exec args shows the args an active option
appends (new string in all locales). The picker re-reads state on every open, both
game screens share one state holder, and saving a selection no longer loads every
shortcut's icon. The launcher re-quotes forwarded args per CommandLineToArgvW rules,
drops whole args with a logged warning instead of cutting mid-token, and no longer
logs raw command lines (execArgs can carry credentials). The on-disk option filter
matches case-insensitively, like the launch path resolves those same paths. The
family-shared flag is per-process native state like the pushed command line, so
warm (stamp-hit) launches now re-push both instead of only the command line.