Gate ghostty binding → main menu forwarding on a real item match (#259)
`⌘⇧,` (ghostty's `reload_config`) did nothing in Supacode because the
surface view forwarded every consumed ghostty binding to
`NSApp.mainMenu.performKeyEquivalent` wholesale, which can intercept
ghostty-only shortcuts. Now only forward when an item actually matches
key + modifier mask (with implicit-shift handling for uppercase
keyEquivalent).
Fixes #240.
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