fix(ui): show no tile chrome in the Android picture-in-picture window

[renefloor]

The Android PiP window drew a participant tile with its full chrome: the name pill, the connection quality indicator, and an overflow button that nothing in PiP can tap — Android routes taps to the window itself, not to the Flutter view.

The button is the new part. StreamParticipantTile grows an overflow menu whenever actions exist, and an app that registers a participantTile builder adding actions to every tile — as the dogfooding app does with Pin/Mute — got one in PiP too. On main the overlay used StreamCallParticipant, which has no menu, but it did show the name pill and the connection indicator: those two defaults are true, and both stay. What goes with the button is the camera-off icon and the sound indicator, which is also what removes the doubled overlay inside the pill — the indicator's box fills with the same 75%-black token the pill uses, so on top of it the two composite to ~94%.

Suppressed through the style rather than the props, so the app-wide builder does not put the menu back — the same way StreamLobbyView does it for its preview tile. The overlay's screen-share branch draws no chrome and needed nothing.

The window's shape is the system's, so the tile no longer draws a shape of its own: square corners, because a rounded tile inside a rounded window left the black Material showing through as wedges, and no outline, because one drawn square has its corners clipped away and reads as a border down the sides. The name pill and the indicator then sit flush in the corners, each square on the corner it occupies and rounded only on the inner one — which is also what stream-video-swift does (cornerRadius(8, corners: [.topRight]) and [.topLeft]), and it gives the name the width the inset was taking.

Both are configurable rather than fixed:

• StreamPictureInPictureThemeData on StreamVideoTheme, whose StreamPictureInPictureStyle.tileStyle restyles the tile and can put any of the chrome back. The window is inserted into the nearest Overlay, above the route showing the call, so it has to be set on the theme or above the Navigator — a StreamPictureInPictureTheme around the call screen is not an ancestor of it.
• StreamParticipantLabelStyle.showVideoOffIcon, for the camera-off icon, which had no switch of its own next to showAudioIndicator.

The name pill also draws nothing at all now when it has neither a name nor an indicator, rather than an empty rounded rectangle over the video. CallParticipantState.name has no userId fallback, so with both icons off an unnamed participant would have hit that.

iOS is untouched: its native PiP renders from IOSPictureInPictureConfiguration, whose showParticipantName, showMicrophoneIndicator and showConnectionQualityIndicator all default to true. stream-video-swift shows the same — name, mic and connection quality — and its name pill has no flag to turn off at all, so Android now reads closer to iOS than it did before this PR, not further from it.

Testing

Seven widget tests on the overlay: the name and indicator are drawn; the overflow button, camera icon and sound indicator are not; the tile is square and draws no outline, speaking or not; the chrome is anchored in the corners; the indicator is squared without dropping a fill an app themed it with; and everything the window suppresses comes back when the picture-in-picture theme asks for it. Three more on the label cover the new showVideoOffIcon and the empty pill.

Verified on a Pixel 8 in a real PiP window, camera on and off, cropped to the window's own bounds (128x228 dp).

🤖 Generated with Claude Code

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[codecov]

Codecov Report

❌ Patch coverage is 97.77778% with 1 line in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (v2@ad336b1). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
...ideo_flutter/lib/src/theme/stream_video_theme.dart	85.71%	1 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##             v2    #1344   +/-   ##
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  Coverage      ?   31.38%           
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  Files         ?      376           
  Lines         ?    28830           
  Branches      ?        0           
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  Hits          ?     9048           
  Misses        ?    19782           
  Partials      ?        0           

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