Media: the caption outlasts the bar; one Space per press; narrow boxes hold

Only the bar fades now, so the caption stays while the controls rest, and
the caption chip can shrink, so a long line wraps inside a narrow player.
A focused media button keeps Space to itself, since gpui presses it on
the release. The player and the strip let Command and Control letters
pass. The scrubber's tip splits the free width by the pointer's share and
stays over the track at both ends. An inline edit's label gives way with
an ellipsis beside fixed parts.

The player is a Tab stop only when a key does something, logs its
captions, keys its fade by its own id, and logs a failed wake.

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

AGENTS.md

@@ -71,10 +71,12 @@ Ely GPUI Component. A component library for GPUI, in light and dark.
 - A menu goes through `menus::menu`: rows, submenus, keys, focus and presses outside live there, for DropdownMenu, OverflowMenu, SplitButton, ContextMenu, SearchableMenu and MenuBar. A press on the host's own box is the host's to handle, so a trigger toggles and a right click moves a context menu without a close and reopen in one event.
 - gpui focuses the nearest focusable ancestor on mouse down, and apps wrap everything in a `FocusScope`. A press that must leave focus alone calls `prevent_default`, as buttons and context regions do.
 - gpui draws a window's first frame inside `open_window`. State the first frame reads, such as `cx.set_menus`, is set before it opens.
-- gpui clicks a focused element when Enter or Space is released. An overlay that hands focus back picks on release too; a pick on press returns focus first, and the release clicks the opener again. An edit in place that hands focus back keeps its text on Enter's release (`forms::InlineEdit`).
+- gpui clicks a focused element when Enter or Space is released. An overlay that hands focus back picks on release too; a pick on press returns focus first, and the release clicks the opener again. An edit in place that hands focus back keeps its text on Enter's release (`forms::InlineEdit`). The press itself bubbles, so a container that takes Space leaves a focused button its own: `overlays::media_button` stops it.
 - A focus handle a component hands back lives across all its modes: take it with `tab_stop` before any early return, or keyed state drops it while the other mode draws and the handed-back focus lands nowhere.
 - A dialog goes through `overlays::Dialog`: scrim, focus trap, Escape and focus return live there. AlertDialog, ConfirmDialog and PromptDialog build on it; a fullscreen dialog fills the window below its title bar. A dialog's card fits the window, a title bar's height clear at each end; its body scrolls and its actions stay.
 - Controls on a dark layer over pictures are `overlays::media_button`, light icons that dim when they have nowhere to go, for the lightbox and a video player's bar alike.
+- A component's letter keys step aside while Command or Control is held, so the app's shortcuts reach the app (`media::ImageAnnotator`, `VideoPlayer`, `VideoThumbnailStrip`).
+- A tip over a track splits the free width around it by the pointer's share: it stays inside the track and under the pointer, and nothing is measured (`media::Scrubber`).
 - `primitives::Severity` names info, success, warning and danger with their colors and icons, for alerts and feedback alike.
 - Rows that move are keyed. `motion::Flip` places them absolutely from last frame's heights, so no frame shows a row at its new place before it glides there, and drives the glide from elapsed time: an animation id that changes per move would rebuild the row's keyed state. `Reorder` holds a row by key, drags with an empty ghost and moves the held row itself.
 - A marker that slides between items (segment thumb, tab line) measures them with `motion::slide` and eases with `glide`.