feat(images): select many images: ranges, keys, touch and all N matching (#392) (#393)

The workspace Images page selects like a file manager in Grid, List and
Masonry, across every loaded batch: Shift+click ranges from the anchor,
Ctrl/Cmd+click toggles a card without opening it, Ctrl/Cmd+A selects the
loaded images, Shift+arrows extend, Escape clears, and a touch long-press
starts a selection mode in which taps toggle. A plain click still opens or
inspects.

Once every loaded image is checked and more match, the bar offers
"Select all N matching". Add tags, Auto-tag selected and Set category then
send the listing filter instead of N identities: the image-tags job takes
`filter` in place of `targets` and /bulk/category takes `images_filter`,
both resolved by the listing's own admission code (up to 10,000 images, a
Source bound by its root_scope). Export metadata waits for loaded images.

Recorded as deviation D135; the concept is unchanged.

web/js/workspace/workspace.css

@@ -142,6 +142,8 @@ main:focus-visible { outline: 2px solid var(--ca-focus); outline-offset: 4px; }
    absolute. Columns and gap still come from the concept's `.image-grid` tracks. */
 .image-grid { position: relative; /* D3 */ }
 .image-grid > .media-card { position: absolute; }
+/* #392 D135: a long-press on a card selects it, so no image callout (iOS) takes the press. */
+#image-grid > .media-card { -webkit-touch-callout: none; }
 /* #249 D3: a list row's info keeps its own height so it can be measured; centred, it looks as the stretched concept row.
    #249 D31: it may also shrink below a long nowrap title (the h3 ellipsis then applies, as in the grid). */
 .list-grid .media-info { align-self: center; min-width: 0; /* D3, D31 */ }