Adds a loop button next to the play/pause control in the preview toolbar. When enabled, preview playback wraps back to the start of the timeline instead of pausing on reaching the end. The state is persisted as a per-project setting and defaults to off. - Add optional \`loop: boolean\` field to \`TProjectSettings\` - Add \`LoopToggleButton\` in the preview toolbar, wired through \`UpdateProjectSettingsCommand\` so toggling is undoable - In \`PlaybackManager.updateTime\`, when the playhead reaches the end and the project's \`loop\` setting is on, reset to time zero and continue scheduling animation frames instead of pausing. The audio manager picks up the seek-to-zero through the existing \`onSeek\` listener, so audio restarts in sync with video. |
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