Media · Capture and devices: recorder, camera, mic meter, device choice and 3D model viewer

ScreenRecorderControls holds a recording in one pill: Record, then a live
dot and the time it has run beside pause or resume and stop, with mic and
camera toggles. CameraPreview shows host frames in the camera's shape, or
the camera off. MicLevelMeter lights segments up to the level, amber and
red near the top, with tones shared from data_display. DeviceSelector
picks a microphone, camera or speaker through Select, which may now be
empty while shut. ModelViewer shows the host's frame for an orbit that a
drag, the arrows, Command-scroll, + and - and a reset move; the orbit is
seeded from the host so fast drags add up. The gallery draws a stone
torus per orbit and frees each replaced frame.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

AGENTS.md

@@ -113,6 +113,7 @@ Ely GPUI Component. A component library for GPUI, in light and dark.
 - Set an explicit line height on any box that clips text. gpui's default leading is taller than a tight box, and the clip eats descenders.
 - gpui's `img` takes its picture's pixel size for any `Auto` side, and its aspect ratio beats percent heights in flow. `Image` pins it absolute at full size, so an `Image` needs a sized box.
 - Badges, tags and avatars live in `data_display`; forms and shell draw theirs from there, and `data_display` imports neither. Avatars take square pictures.
+- A picture drawn in code reaches gpui as a `RenderImage`. A host that replaces one frees the old through `App::drop_image`, or every frame stays in the sprite atlas (the gallery's model).
 - `img()` keeps loading state, and moves an animated picture's frames, only with an id. Content masks are rectangles, so rounded corners survive only when the image fills its box without cropping.
 - gpui reads a `&str` picture source as a web address. A file goes through `Path` (`documents::source` in the crate, `Path::new` in the gallery).
 - Taffy 0.9's grid rows overgrow tiles that keep a ratio. Tiles in a picture's shape sit in flex rows of `flex_1` cells (`generative::GenerationGrid`).
@@ -143,6 +144,7 @@ Ely GPUI Component. A component library for GPUI, in light and dark.
 - gpui styles a drag-over only on an element with its own hitbox. A veil that shows while files hover takes the drop itself (`chat::DragDropOverlay`).
 - gpui 0.2.2 never clears `debug_bounds`: a test sees an element appear, not leave.
 - The system time zone comes from `typography::format::system_zone`, which fails loud; jiff's `TimeZone::system()` falls back to UTC in silence.
+- A Select with nothing to pick stays shut: disabled, it shows its placeholder; open, it fails (`media::DeviceSelector` says no device was found).
 - A list opens with its cursor on the current choice: Select on the chosen row, Combobox on its value, MultiSelect on the first one ticked, SelectableList on its first selected row. A selection the owner makes, not the echo of the list's own pick, moves SelectableList's cursor there.
 - A search step, a tool call or an agent's step says where it stands with `chat::StepState` and draws it with `chat::step_mark`.
 - A flex line whose free space goes to an auto margin loses its gaps in taffy 0.9. A row that parts left and right groups its sides and uses `justify_between`; `ml_auto` is safe only beside a `flex_1` item that leaves no free space.