Add seek preview thumbnails

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val seekPreviewConfig = SeekPreviewConfig.Builder()
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    .setEnabled(true)
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    .setFallbackMode(PreviewFallbackMode.TIMESTAMP) // or NONE
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    .setEnablePreload(true)
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    .setPreloadRadius(1)
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    .setCacheEnabled(true)
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    .build()
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val player = FastPixPlayer.Builder(context)
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    .setSeekPreviewConfig(seekPreviewConfig)
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    .build()

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player.setSeekPreviewListener(object : SeekPreviewListenerAdapter() {
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    override fun onSpritesheetInitialized() {
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        // Spritesheet metadata is available and preview can be used
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    }
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    override fun onSpritesheetFailed(error: Throwable) {
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        // Spritesheet unavailable; fallback may still work depending on config
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    }
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    override fun onPreviewShow() {
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        // Show your preview container
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    }
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    override fun onPreviewHide() {
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        // Hide your preview container
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    }
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    override fun onSpritesheetLoaded(metadata: SpritesheetMetadata) {
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        // metadata.bitmap: bitmap for current position (can be null in timestamp fallback)
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        // metadata.timestampMs: current seek timestamp (ms)
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        // Additional fields: rows, columns, frameWidth, frameHeight, frameCount,
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        // durationMs, intervalMs (distance between frames)
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    }
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})

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seekBar.setOnSeekBarChangeListener(object : SeekBar.OnSeekBarChangeListener {
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    override fun onStartTrackingTouch(seekBar: SeekBar) {
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        player.showPreview()
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    }
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    override fun onProgressChanged(seekBar: SeekBar, progress: Int, fromUser: Boolean) {
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        if (fromUser) {
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            player.loadPreview(progress.toLong()) // progress in ms
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        }
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    }
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    override fun onStopTrackingTouch(seekBar: SeekBar) {
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        player.hidePreview()
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        player.seekTo(seekBar.progress.toLong())
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    }
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})

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val bmp = player.getPreviewBitmap(timeMs = 30_000)
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val label = player.formatTimestamp(timeMs = 30_000)