PhonePhoto: add companionDevicePath (MOV path stored on the HEIC).
iOS helper: detect Live Photo pairs by IMG_XXXX filename matching.
MOVs with a paired HEIC get isLivePhotoMotion=true, sourceFolder='Live Photo'.
HEICs with a paired MOV get isLivePhotoStill=true, companionDevicePath set.
Grid: Live Photo MOVs appear only in 'Live Photo' folder (Other section).
HEIC stills show a LIVE badge. Camera folder stays clean.
Import: 'Import Live Photo motion clips' toggle (default off).
When on, Copier pulls the companion MOV alongside the HEIC atomically.
Delete: deleteVerifiedFromDevice also deletes the companion MOV when
deleting a Live Photo still.
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