Stop drawing a hover ring on a device that cannot hover

A cell drew a 1px ring while the pointer was over it, in the same colour
as the 2px ring that means "selected". On a tablet there is no pointer,
and `has-hover` is not the harmless no-op that implies: Slint raises it
on a touch press and lowers it on the `Exit` that normally follows the
release — but the release that ends a pinch carries no `Exit` at all,
and neither does a finger lifting while a second one is still down.

So resizing the thumbnails, which is a pinch, left a ring around
whichever cell each finger had come down on. The grid then showed boxes
around photographs that were not selected, a pixel thinner than the ones
that were, with nothing to tell them apart.

Hover chrome has no meaning once there has been a finger, so it is not
drawn: the same `touched` latch the rating strip already keys off.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

docs/traceability.md

@@ -121,9 +121,9 @@ _None._
 | FR-RAW-4 | [`core/dr-decode/src/error.rs:1`](../core/dr-decode/src/error.rs#L1), [`ui/dr-ui/src/lib.rs:219`](../ui/dr-ui/src/lib.rs#L219) |
 | FR-RAW-5 | [`core/dr-decode/src/lib.rs:167`](../core/dr-decode/src/lib.rs#L167), [`core/dr-gpu/src/demosaic.rs:34`](../core/dr-gpu/src/demosaic.rs#L34), [`core/dr-gpu/src/demosaic.rs:602`](../core/dr-gpu/src/demosaic.rs#L602), [`core/dr-gpu/src/demosaic.rs:681`](../core/dr-gpu/src/demosaic.rs#L681), [`core/dr-gpu/src/demosaic.rs:805`](../core/dr-gpu/src/demosaic.rs#L805) |
 | FR-UI-1 | [`ui/dr-ui/src/lib.rs:3216`](../ui/dr-ui/src/lib.rs#L3216), [`ui/dr-ui/src/lib.rs:89`](../ui/dr-ui/src/lib.rs#L89), [`ui/dr-ui/src/lib.rs:96`](../ui/dr-ui/src/lib.rs#L96), [`ui/dr-ui/src/masks_ui.rs:816`](../ui/dr-ui/src/masks_ui.rs#L816), [`ui/dr-ui/ui/app.slint:2162`](../ui/dr-ui/ui/app.slint#L2162), [`ui/dr-ui/ui/identity.slint:181`](../ui/dr-ui/ui/identity.slint#L181), [`ui/dr-ui/ui/library.slint:1091`](../ui/dr-ui/ui/library.slint#L1091), [`ui/dr-ui/ui/toolrail.slint:88`](../ui/dr-ui/ui/toolrail.slint#L88) |
-| FR-UI-2 | [`ui/dr-ui/src/collections_ui.rs:1008`](../ui/dr-ui/src/collections_ui.rs#L1008), [`ui/dr-ui/src/collections_ui.rs:1018`](../ui/dr-ui/src/collections_ui.rs#L1018), [`ui/dr-ui/src/collections_ui.rs:119`](../ui/dr-ui/src/collections_ui.rs#L119), [`ui/dr-ui/src/collections_ui.rs:1501`](../ui/dr-ui/src/collections_ui.rs#L1501), [`ui/dr-ui/src/collections_ui.rs:1515`](../ui/dr-ui/src/collections_ui.rs#L1515), [`ui/dr-ui/src/collections_ui.rs:160`](../ui/dr-ui/src/collections_ui.rs#L160), [`ui/dr-ui/src/collections_ui.rs:1767`](../ui/dr-ui/src/collections_ui.rs#L1767), [`ui/dr-ui/src/collections_ui.rs:2818`](../ui/dr-ui/src/collections_ui.rs#L2818), [`ui/dr-ui/src/collections_ui.rs:486`](../ui/dr-ui/src/collections_ui.rs#L486), [`ui/dr-ui/src/gestures.rs:1`](../ui/dr-ui/src/gestures.rs#L1), [`ui/dr-ui/src/lib.rs:89`](../ui/dr-ui/src/lib.rs#L89), [`ui/dr-ui/src/library_ui.rs:308`](../ui/dr-ui/src/library_ui.rs#L308), [`ui/dr-ui/src/library_ui.rs:5416`](../ui/dr-ui/src/library_ui.rs#L5416), [`ui/dr-ui/src/library_ui.rs:5561`](../ui/dr-ui/src/library_ui.rs#L5561), [`ui/dr-ui/src/library_ui.rs:6766`](../ui/dr-ui/src/library_ui.rs#L6766), [`ui/dr-ui/ui/app.slint:541`](../ui/dr-ui/ui/app.slint#L541), [`ui/dr-ui/ui/app.slint:548`](../ui/dr-ui/ui/app.slint#L548), [`ui/dr-ui/ui/app.slint:59`](../ui/dr-ui/ui/app.slint#L59), [`ui/dr-ui/ui/app.slint:899`](../ui/dr-ui/ui/app.slint#L899), [`ui/dr-ui/ui/controls.slint:474`](../ui/dr-ui/ui/controls.slint#L474), [`ui/dr-ui/ui/gestures.slint:1`](../ui/dr-ui/ui/gestures.slint#L1), [`ui/dr-ui/ui/library.slint:1259`](../ui/dr-ui/ui/library.slint#L1259), [`ui/dr-ui/ui/library.slint:1266`](../ui/dr-ui/ui/library.slint#L1266), [`ui/dr-ui/ui/library.slint:1329`](../ui/dr-ui/ui/library.slint#L1329), [`ui/dr-ui/ui/library.slint:2561`](../ui/dr-ui/ui/library.slint#L2561), [`ui/dr-ui/ui/library.slint:3866`](../ui/dr-ui/ui/library.slint#L3866), [`ui/dr-ui/ui/library.slint:842`](../ui/dr-ui/ui/library.slint#L842), [`ui/dr-ui/ui/library.slint:898`](../ui/dr-ui/ui/library.slint#L898), [`ui/dr-ui/ui/presets.slint:19`](../ui/dr-ui/ui/presets.slint#L19), [`ui/dr-ui/ui/settings.slint:110`](../ui/dr-ui/ui/settings.slint#L110) |
+| FR-UI-2 | [`ui/dr-ui/src/collections_ui.rs:1008`](../ui/dr-ui/src/collections_ui.rs#L1008), [`ui/dr-ui/src/collections_ui.rs:1018`](../ui/dr-ui/src/collections_ui.rs#L1018), [`ui/dr-ui/src/collections_ui.rs:119`](../ui/dr-ui/src/collections_ui.rs#L119), [`ui/dr-ui/src/collections_ui.rs:1501`](../ui/dr-ui/src/collections_ui.rs#L1501), [`ui/dr-ui/src/collections_ui.rs:1515`](../ui/dr-ui/src/collections_ui.rs#L1515), [`ui/dr-ui/src/collections_ui.rs:160`](../ui/dr-ui/src/collections_ui.rs#L160), [`ui/dr-ui/src/collections_ui.rs:1767`](../ui/dr-ui/src/collections_ui.rs#L1767), [`ui/dr-ui/src/collections_ui.rs:2818`](../ui/dr-ui/src/collections_ui.rs#L2818), [`ui/dr-ui/src/collections_ui.rs:486`](../ui/dr-ui/src/collections_ui.rs#L486), [`ui/dr-ui/src/gestures.rs:1`](../ui/dr-ui/src/gestures.rs#L1), [`ui/dr-ui/src/lib.rs:89`](../ui/dr-ui/src/lib.rs#L89), [`ui/dr-ui/src/library_ui.rs:308`](../ui/dr-ui/src/library_ui.rs#L308), [`ui/dr-ui/src/library_ui.rs:5416`](../ui/dr-ui/src/library_ui.rs#L5416), [`ui/dr-ui/src/library_ui.rs:5561`](../ui/dr-ui/src/library_ui.rs#L5561), [`ui/dr-ui/src/library_ui.rs:6766`](../ui/dr-ui/src/library_ui.rs#L6766), [`ui/dr-ui/ui/app.slint:541`](../ui/dr-ui/ui/app.slint#L541), [`ui/dr-ui/ui/app.slint:548`](../ui/dr-ui/ui/app.slint#L548), [`ui/dr-ui/ui/app.slint:59`](../ui/dr-ui/ui/app.slint#L59), [`ui/dr-ui/ui/app.slint:899`](../ui/dr-ui/ui/app.slint#L899), [`ui/dr-ui/ui/controls.slint:474`](../ui/dr-ui/ui/controls.slint#L474), [`ui/dr-ui/ui/gestures.slint:1`](../ui/dr-ui/ui/gestures.slint#L1), [`ui/dr-ui/ui/library.slint:1259`](../ui/dr-ui/ui/library.slint#L1259), [`ui/dr-ui/ui/library.slint:1266`](../ui/dr-ui/ui/library.slint#L1266), [`ui/dr-ui/ui/library.slint:1329`](../ui/dr-ui/ui/library.slint#L1329), [`ui/dr-ui/ui/library.slint:2561`](../ui/dr-ui/ui/library.slint#L2561), [`ui/dr-ui/ui/library.slint:3878`](../ui/dr-ui/ui/library.slint#L3878), [`ui/dr-ui/ui/library.slint:842`](../ui/dr-ui/ui/library.slint#L842), [`ui/dr-ui/ui/library.slint:898`](../ui/dr-ui/ui/library.slint#L898), [`ui/dr-ui/ui/presets.slint:19`](../ui/dr-ui/ui/presets.slint#L19), [`ui/dr-ui/ui/settings.slint:110`](../ui/dr-ui/ui/settings.slint#L110) |
 | FR-UI-3 | [`ui/dr-ui/src/develop.rs:2248`](../ui/dr-ui/src/develop.rs#L2248), [`ui/dr-ui/src/develop.rs:2357`](../ui/dr-ui/src/develop.rs#L2357), [`ui/dr-ui/src/library_ui.rs:4525`](../ui/dr-ui/src/library_ui.rs#L4525), [`ui/dr-ui/src/masks_ui.rs:218`](../ui/dr-ui/src/masks_ui.rs#L218), [`ui/dr-ui/src/masks_ui.rs:908`](../ui/dr-ui/src/masks_ui.rs#L908), [`ui/dr-ui/src/masks_ui.rs:930`](../ui/dr-ui/src/masks_ui.rs#L930), [`ui/dr-ui/src/spots_ui.rs:19`](../ui/dr-ui/src/spots_ui.rs#L19), [`ui/dr-ui/ui/app.slint:1971`](../ui/dr-ui/ui/app.slint#L1971), [`ui/dr-ui/ui/collections.slint:4`](../ui/dr-ui/ui/collections.slint#L4), [`ui/dr-ui/ui/collections.slint:682`](../ui/dr-ui/ui/collections.slint#L682), [`ui/dr-ui/ui/masks.slint:516`](../ui/dr-ui/ui/masks.slint#L516) |
-| FR-UI-4 | [`tools/traceability/src/gestures.rs:1`](../tools/traceability/src/gestures.rs#L1), [`tools/traceability/src/gestures.rs:366`](../tools/traceability/src/gestures.rs#L366), [`ui/dr-ui/src/collections_ui.rs:1008`](../ui/dr-ui/src/collections_ui.rs#L1008), [`ui/dr-ui/src/collections_ui.rs:1018`](../ui/dr-ui/src/collections_ui.rs#L1018), [`ui/dr-ui/src/collections_ui.rs:119`](../ui/dr-ui/src/collections_ui.rs#L119), [`ui/dr-ui/src/collections_ui.rs:132`](../ui/dr-ui/src/collections_ui.rs#L132), [`ui/dr-ui/src/collections_ui.rs:1501`](../ui/dr-ui/src/collections_ui.rs#L1501), [`ui/dr-ui/src/collections_ui.rs:1515`](../ui/dr-ui/src/collections_ui.rs#L1515), [`ui/dr-ui/src/collections_ui.rs:160`](../ui/dr-ui/src/collections_ui.rs#L160), [`ui/dr-ui/src/collections_ui.rs:1631`](../ui/dr-ui/src/collections_ui.rs#L1631), [`ui/dr-ui/src/collections_ui.rs:1767`](../ui/dr-ui/src/collections_ui.rs#L1767), [`ui/dr-ui/src/collections_ui.rs:1794`](../ui/dr-ui/src/collections_ui.rs#L1794), [`ui/dr-ui/src/collections_ui.rs:1893`](../ui/dr-ui/src/collections_ui.rs#L1893), [`ui/dr-ui/src/collections_ui.rs:2818`](../ui/dr-ui/src/collections_ui.rs#L2818), [`ui/dr-ui/src/collections_ui.rs:486`](../ui/dr-ui/src/collections_ui.rs#L486), [`ui/dr-ui/src/collections_ui.rs:560`](../ui/dr-ui/src/collections_ui.rs#L560), [`ui/dr-ui/src/gesture_book.rs:3`](../ui/dr-ui/src/gesture_book.rs#L3), [`ui/dr-ui/src/gestures.rs:1`](../ui/dr-ui/src/gestures.rs#L1), [`ui/dr-ui/src/library_ui.rs:4525`](../ui/dr-ui/src/library_ui.rs#L4525), [`ui/dr-ui/src/library_ui.rs:4537`](../ui/dr-ui/src/library_ui.rs#L4537), [`ui/dr-ui/src/library_ui.rs:4589`](../ui/dr-ui/src/library_ui.rs#L4589), [`ui/dr-ui/src/library_ui.rs:4692`](../ui/dr-ui/src/library_ui.rs#L4692), [`ui/dr-ui/src/library_ui.rs:4720`](../ui/dr-ui/src/library_ui.rs#L4720), [`ui/dr-ui/src/library_ui.rs:5549`](../ui/dr-ui/src/library_ui.rs#L5549), [`ui/dr-ui/src/library_ui.rs:5561`](../ui/dr-ui/src/library_ui.rs#L5561), [`ui/dr-ui/ui/app.slint:1811`](../ui/dr-ui/ui/app.slint#L1811), [`ui/dr-ui/ui/app.slint:517`](../ui/dr-ui/ui/app.slint#L517), [`ui/dr-ui/ui/app.slint:548`](../ui/dr-ui/ui/app.slint#L548), [`ui/dr-ui/ui/app.slint:633`](../ui/dr-ui/ui/app.slint#L633), [`ui/dr-ui/ui/gestures.slint:1`](../ui/dr-ui/ui/gestures.slint#L1), [`ui/dr-ui/ui/library.slint:1067`](../ui/dr-ui/ui/library.slint#L1067), [`ui/dr-ui/ui/library.slint:1234`](../ui/dr-ui/ui/library.slint#L1234), [`ui/dr-ui/ui/library.slint:1259`](../ui/dr-ui/ui/library.slint#L1259), [`ui/dr-ui/ui/library.slint:1266`](../ui/dr-ui/ui/library.slint#L1266), [`ui/dr-ui/ui/library.slint:1322`](../ui/dr-ui/ui/library.slint#L1322), [`ui/dr-ui/ui/library.slint:1329`](../ui/dr-ui/ui/library.slint#L1329), [`ui/dr-ui/ui/library.slint:2561`](../ui/dr-ui/ui/library.slint#L2561), [`ui/dr-ui/ui/library.slint:3866`](../ui/dr-ui/ui/library.slint#L3866), [`ui/dr-ui/ui/library.slint:842`](../ui/dr-ui/ui/library.slint#L842), [`ui/dr-ui/ui/library.slint:892`](../ui/dr-ui/ui/library.slint#L892), [`ui/dr-ui/ui/library.slint:898`](../ui/dr-ui/ui/library.slint#L898), [`ui/dr-ui/ui/library.slint:917`](../ui/dr-ui/ui/library.slint#L917) |
+| FR-UI-4 | [`tools/traceability/src/gestures.rs:1`](../tools/traceability/src/gestures.rs#L1), [`tools/traceability/src/gestures.rs:366`](../tools/traceability/src/gestures.rs#L366), [`ui/dr-ui/src/collections_ui.rs:1008`](../ui/dr-ui/src/collections_ui.rs#L1008), [`ui/dr-ui/src/collections_ui.rs:1018`](../ui/dr-ui/src/collections_ui.rs#L1018), [`ui/dr-ui/src/collections_ui.rs:119`](../ui/dr-ui/src/collections_ui.rs#L119), [`ui/dr-ui/src/collections_ui.rs:132`](../ui/dr-ui/src/collections_ui.rs#L132), [`ui/dr-ui/src/collections_ui.rs:1501`](../ui/dr-ui/src/collections_ui.rs#L1501), [`ui/dr-ui/src/collections_ui.rs:1515`](../ui/dr-ui/src/collections_ui.rs#L1515), [`ui/dr-ui/src/collections_ui.rs:160`](../ui/dr-ui/src/collections_ui.rs#L160), [`ui/dr-ui/src/collections_ui.rs:1631`](../ui/dr-ui/src/collections_ui.rs#L1631), [`ui/dr-ui/src/collections_ui.rs:1767`](../ui/dr-ui/src/collections_ui.rs#L1767), [`ui/dr-ui/src/collections_ui.rs:1794`](../ui/dr-ui/src/collections_ui.rs#L1794), [`ui/dr-ui/src/collections_ui.rs:1893`](../ui/dr-ui/src/collections_ui.rs#L1893), [`ui/dr-ui/src/collections_ui.rs:2818`](../ui/dr-ui/src/collections_ui.rs#L2818), [`ui/dr-ui/src/collections_ui.rs:486`](../ui/dr-ui/src/collections_ui.rs#L486), [`ui/dr-ui/src/collections_ui.rs:560`](../ui/dr-ui/src/collections_ui.rs#L560), [`ui/dr-ui/src/gesture_book.rs:3`](../ui/dr-ui/src/gesture_book.rs#L3), [`ui/dr-ui/src/gestures.rs:1`](../ui/dr-ui/src/gestures.rs#L1), [`ui/dr-ui/src/library_ui.rs:4525`](../ui/dr-ui/src/library_ui.rs#L4525), [`ui/dr-ui/src/library_ui.rs:4537`](../ui/dr-ui/src/library_ui.rs#L4537), [`ui/dr-ui/src/library_ui.rs:4589`](../ui/dr-ui/src/library_ui.rs#L4589), [`ui/dr-ui/src/library_ui.rs:4692`](../ui/dr-ui/src/library_ui.rs#L4692), [`ui/dr-ui/src/library_ui.rs:4720`](../ui/dr-ui/src/library_ui.rs#L4720), [`ui/dr-ui/src/library_ui.rs:5549`](../ui/dr-ui/src/library_ui.rs#L5549), [`ui/dr-ui/src/library_ui.rs:5561`](../ui/dr-ui/src/library_ui.rs#L5561), [`ui/dr-ui/ui/app.slint:1811`](../ui/dr-ui/ui/app.slint#L1811), [`ui/dr-ui/ui/app.slint:517`](../ui/dr-ui/ui/app.slint#L517), [`ui/dr-ui/ui/app.slint:548`](../ui/dr-ui/ui/app.slint#L548), [`ui/dr-ui/ui/app.slint:633`](../ui/dr-ui/ui/app.slint#L633), [`ui/dr-ui/ui/gestures.slint:1`](../ui/dr-ui/ui/gestures.slint#L1), [`ui/dr-ui/ui/library.slint:1067`](../ui/dr-ui/ui/library.slint#L1067), [`ui/dr-ui/ui/library.slint:1234`](../ui/dr-ui/ui/library.slint#L1234), [`ui/dr-ui/ui/library.slint:1259`](../ui/dr-ui/ui/library.slint#L1259), [`ui/dr-ui/ui/library.slint:1266`](../ui/dr-ui/ui/library.slint#L1266), [`ui/dr-ui/ui/library.slint:1322`](../ui/dr-ui/ui/library.slint#L1322), [`ui/dr-ui/ui/library.slint:1329`](../ui/dr-ui/ui/library.slint#L1329), [`ui/dr-ui/ui/library.slint:2561`](../ui/dr-ui/ui/library.slint#L2561), [`ui/dr-ui/ui/library.slint:3878`](../ui/dr-ui/ui/library.slint#L3878), [`ui/dr-ui/ui/library.slint:842`](../ui/dr-ui/ui/library.slint#L842), [`ui/dr-ui/ui/library.slint:892`](../ui/dr-ui/ui/library.slint#L892), [`ui/dr-ui/ui/library.slint:898`](../ui/dr-ui/ui/library.slint#L898), [`ui/dr-ui/ui/library.slint:917`](../ui/dr-ui/ui/library.slint#L917) |
 | FR-UI-5 | [`ui/dr-ui/src/collections_ui.rs:1`](../ui/dr-ui/src/collections_ui.rs#L1), [`ui/dr-ui/src/lib.rs:2653`](../ui/dr-ui/src/lib.rs#L2653), [`ui/dr-ui/src/lib.rs:3255`](../ui/dr-ui/src/lib.rs#L3255), [`ui/dr-ui/src/lib.rs:3440`](../ui/dr-ui/src/lib.rs#L3440), [`ui/dr-ui/src/masks_ui.rs:863`](../ui/dr-ui/src/masks_ui.rs#L863), [`ui/dr-ui/ui/app.slint:120`](../ui/dr-ui/ui/app.slint#L120), [`ui/dr-ui/ui/collections.slint:4`](../ui/dr-ui/ui/collections.slint#L4) |
 | FR-UI-6 | [`ui/dr-ui/ui/widgets.slint:1`](../ui/dr-ui/ui/widgets.slint#L1) |
 | FR-UI-7 | [`core/dr-pipeline/src/descriptor.rs:177`](../core/dr-pipeline/src/descriptor.rs#L177), [`core/dr-pipeline/src/framing.rs:385`](../core/dr-pipeline/src/framing.rs#L385) |