Availability rule + no-Animation video export (source-media issue 08)

[lenxism]

Summary

• The export panel now obeys core's availability verdict (resolveVideoExportAvailability) instead of its UI-local "requires an Animation" gate: video export is offered when the document has an Animation OR the bound Source Media is a decodable Source Video, and disabled otherwise.
• With no Animation, the panel's Duration row (and the export itself, enforced by the Exporter since Deterministic video export: frame-accurate Source Video decode (source-media issue 07) #18) uses resolveVideoExportDuration: the video's own duration capped at 30 s, playing from its start.
• A bound playable-but-undecodable Source Video pins a persistent "codec is not supported in this browser" notice on the export panel (not a transient toast — the condition holds while the file is bound); import and preview stay unaffected.
• The sourceMediaFacts store→core projection the Exporter kept private moves to state/store.ts so the panel and the Exporter share one seam (red→green in state/source-media.test.ts).
• CONTEXT.md's Exporter entry already reflects the availability rule (landed with the issue 06 policy module); verified, no remaining "requires an Animation" text.

Stacked on #18 (deterministic video export) — merge that first.

Test plan

• Full Vitest suite (477), typecheck, lint, build green
• Browser evidence (.scratch/source-media/evidence/08/, system Chrome): bare 8 s frame-counter clip with no Animation exports an 8.000 s MP4, no audio, frames 0/1/60/150/238/239 exactly matching source frames (plays from start)
• 45 s record clamps the panel to "30.0 s · 900 frames"
• No media + no Animation renders disabled with the hint; canDecode: false renders the persistent codec notice with export blocked and the preview still advancing

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Note

Medium Risk
Changes user-visible export eligibility and messaging for video; logic is delegated to tested core policy but mis-synced facts would block or allow exports incorrectly.

Overview
The export panel stops gating video on a local “has Animation” check and instead uses core via resolveVideoExportAvailability and resolveVideoExportDuration, with bound media projected through shared sourceMediaFacts in state/store.ts (moved out of Exporter.tsx so the panel and exporter stay aligned).

Video export is enabled when the document has an Animation or a decodable bound Source Video; duration and frame counts follow resolveVideoExportDuration (including source-only clips capped at 30s). When export is blocked, VideoUnavailableNotice shows either a hint to import video or add motion (nothing-to-export) or a persistent amber codec warning for preview-only undecodable video (undecodable-video), while import/preview stay available.

Unit tests cover the sourceMediaFacts projection (null, image, video, canDecode: false).

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Project	Deployment	Actions	Updated (UTC)
mockstudio	Ready	Preview, Comment	Jul 14, 2026 4:27am