desktopEntryMatchesApp used a loose substring match that accepted any
desktop entry whose Exec line mentioned a terminal launcher. A non-
terminal app launched via xdg-terminal-exec (e.g. a TUI helper) was
mis-attributed to the generic 'terminal' appId, so 'Open in Terminal'
launched the helper script and the picker showed the helper's icon.
For appId === 'terminal' only, require Categories=TerminalEmulator;
ghostty/iterm2 keep name-based matching. The xdg-terminal-exec /
gnome-terminal / konsole / xfce4-terminal / x-terminal-emulator fallback
chain is unchanged, so non-conformant custom terminal entries still
launch. Adds a shared isTerminalEmulatorEntry predicate used by both
buildLinuxOpenSpecs (launch) and buildLinuxInstalledApps (icon).
Smoke test gains a generic helper-app fixture (non-terminal app whose
Exec uses xdg-terminal-exec) plus a TerminalEmulator entry, with
assertions that the helper script is never launched and the terminal
emulator's icon resolves instead of the helper's. Two byte-distinct
PNGs keep the icon assertion a real discriminator.
Pablo
a40654dfbb