Add extension-frame refine and lossless anchor options.

Prefer clip anchor PNGs for handoffs, optionally run Bilateral+Flux cleanup before I2V, and save decoded last-frame anchors so sequential extensions accumulate less compression damage.

Co-authored-by: Cursor <cursoragent@cursor.com>

server/utils/watch.ts

@@ -275,6 +275,34 @@ export function watchComfyJob(job: Job, options: { persist?: boolean } = {}): Pr
               loraStack: job.library.loraStack,
               segmentFirstFrame
             })
+            if (job.library.saveLosslessAnchor === true) {
+              try {
+                const { persistClipAnchorFrame, extractAnchorImageFromHistory, downloadAnchorImage } = await import('~/server/utils/extensionFrame')
+                let saved = false
+                if (job.promptId && history) {
+                  const anchorImage = extractAnchorImageFromHistory(history, job.promptId)
+                  if (anchorImage) {
+                    const png = await downloadAnchorImage(anchorImage)
+                    if (png.length >= 64) {
+                      await persistClipAnchorFrame({
+                        ownerKey: job.library.ownerKey,
+                        clipId: clip.id,
+                        fromBuffer: png
+                      })
+                      saved = true
+                    }
+                  }
+                }
+                if (!saved) {
+                  await persistClipAnchorFrame({
+                    ownerKey: job.library.ownerKey,
+                    clipId: clip.id
+                  })
+                }
+              } catch {
+                /* Anchor is optional; extension can still extract from MP4. */
+              }
+            }
             job.clipId = clip.id
             job.savedPromptId = job.promptId
             job.hideThumbnail = clip.hideThumbnail