Source-Owned Input Indicator Composition

[mihar-22]

Context

#2046 split status, volume, seek, and announcer behavior into component-owned package boundaries, leaving only lifecycle/action primitives shared. Packaged video/live Skins now compose those components inside a layout-only indicator overlay, but canonical source predates that architecture and emits none of them.

Acceptance criteria

• Canonical manifests expose status, volume, seek, and announcer component parts needed by Skins.
• A private Skin composition arranges the indicator overlay without introducing a generic layout primitive.
• Default and Minimal reuse component behavior while preserving their distinct indicator visuals.
• Live variants omit seek feedback while reusing applicable status and volume feedback.
• Visual indicators remain decorative and the persistent polite announcer remains the accessible output.
• React and HTML output uses public component contracts and exact dependencies.
• Existing lifecycle, action, announcement, and rendered-presence tests extend to generated output.

[github-actions]

Triage notes

• Applied Feature: prefix and labels (components, a11y, pkg:core, pkg:html, pkg:react, skin) to match sibling "Source-Owned X" issues in this batch (e.g. Feature: Source-Owned Play Button #1967, Feature: Source-Owned Volume Controls #1968, Feature: Source-Owned Time Slider and Thumbnail Preview #1969, Feature: Source-Owned Seek Buttons #1982).
• Prerequisite architecture work (refactor(packages)!: separate input indicator components #2046, closing Architecture: Separate Input Indicator Components #2049) is merged, so this is unblocked.

Planning recommendations (not applied)

• Link as sub-epic child of Epic: Canonical Skin Components and Composition #1949 (Epic: Canonical Skin Components and Composition), consistent with siblings.
• Consider adding a Parent sub-epic: #1949 reference in the body, matching the convention used by Feature: Source-Owned Play Button #1967/Feature: Source-Owned Volume Controls #1968/Source-Owned Time Displays and Grouping #1985.
• Recommend including alongside the rest of the currently-unlabeled "Source-Owned" batch (Source-Owned Skin Shell and Poster Composition #2104, Source-Owned Buffering and Error Compositions #2105, Source-Owned Captions Controls #2106, Source-Owned Remote Playback and Picture-in-Picture Controls #2107, Source-Owned Skin Menu Compositions #2108, Source-Owned Hotkey and Gesture Composition #2110) in the same planning pass — they appear to have been opened together and none carry labels/prefixes yet.
• GA milestone (due 2026-08-17) is very near-term; no strong milestone fit is obvious yet given no sibling in this batch is currently milestoned — flagging for maintainer call rather than assigning.
• No clear priority signal in the issue body; leaving P0–P2 to maintainer judgment.