Messaging · Stickers and GIFs: a sticker picker and a GIF picker

StickerPicker shows stickers a pack at a time, chosen above with a
segmented control; a search spans every pack and keeps the stickers
whose names hold it. Arrows move, Enter or a press picks. It reuses the
glyph grid, now forms::picks, which takes its columns and cell size and
titles from the host, so emoji, icons and stickers share one searchable
grid; forms::glyphs keeps the emoji and icon pickers.

GifPicker packs host GIFs in two columns, each moving, under a search
it owns; the host hears the trimmed words only when they change, and
categories fill the search while it is empty. Waiting, it shows tiles
in GIF shapes; finding nothing, it says so. Each GIF is a Tab stop that
a press, Enter or Space picks.

The share toggle now shows its state, as the microphone and camera do.
The gallery ships line-drawn stickers and small GIFs made from its own
pictures.

src/forms/mod.rs

@@ -26,6 +26,7 @@ mod options;
 mod pairs;
 mod path;
 mod pattern;
+mod picks;
 mod pin;
 mod radio;
 mod rating;
@@ -91,6 +92,7 @@ pub use pairs::{FieldArray, KeyValueInput, ListInput};
 pub use path::PathInput;
 pub(crate) use path::choose;
 pub use pattern::{RegexInput, regex_highlights};
+pub(crate) use picks::{Grid, finder, grid, rows};
 pub use pin::PinInput;
 pub use radio::{Radio, RadioGroup};
 pub use rating::Rating;