[veryCrunchy]

Closes #194

Summary

• render photos and native video across the full viewer canvas behind overlay controls
• keep the top action row bounded and status-bar safe in portrait and landscape
• move RAW/JPEG choices into a separate horizontally scrollable, non-wrapping row
• retain fit-at-rest zoom, pan, full-quality loading, editing, tags, actions, and navigation behavior
• add focused layout-policy coverage

Validation

• :ui:desktopTest --tests dev.obiente.nextcloudnative.app.MediaViewerLayoutTest
• :ui:compileDebugKotlinAndroid
• :androidApp:assembleDebug
• tools/check-repository.sh
• git diff --check

[Copilot]

Pull request overview

This PR adjusts the media viewer’s Compose layout policy so photos/native video render across the full viewer canvas (behind overlay chrome) and the top controls remain compact and status-bar safe, including a separate horizontally scrollable RAW/JPEG source row when multiple sources exist.

Changes:

• Remove fixed vertical media padding and render media full-canvas behind overlay controls.
• Restructure the viewer header into a bounded primary action row plus an optional separate, horizontally scrollable source-choice row.
• Introduce a small MediaViewerLayout policy resolver with focused unit coverage.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
ui/src/commonMain/kotlin/dev/obiente/nextcloudnative/app/NextcloudMediaViewer.kt	Applies the new layout policy: full-canvas media rendering and responsive header/source-choice chrome.
ui/src/commonTest/kotlin/dev/obiente/nextcloudnative/app/MediaViewerLayoutTest.kt	Adds deterministic tests for the new layout policy resolver and expected chrome sizing behavior.

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