fix(clip): a clip is held to its owner's storage cap, and its limits and failures say the server's truth

- The cut file is measured against what its owner has left, for a YouTube range (whose fetch never
  reads yt-dlp's size ceiling) and for a Plex clip (which fetches nothing), before the fetch and
  again before it is placed; a refusal leaves the asset pending for a Retry.
- A silent Plex file is cut silent; a file the probe cannot read says so.
- A second job on a failed or renamed clip gets the same YouTube diagnosis and the fetched title.
- The "too long" refusal names the server's cap; a contract test holds the client's copies of the
  clip limits to clip.py; the shipped player clients are pinned against the installed yt-dlp.
- One HDR transfer set and one rating_key lookup; job status words from JobStatus; the display-name
  guard sees subscript writes and the clip route; stale comments and types follow the clip job.

frontend/src/lib/cropGeometry.ts

@@ -53,7 +53,8 @@ export function cropToSourcePx(crop: Frac, srcW: number, srcH: number): CropPx |
 // picture is shown at. A shape lock is the frame's width / height IN THOSE FRACTIONS: a 9:16 output
 // on a 16:9 picture is (9/16) / (16/9) — `fracRatio` turns one into the other.
 
-/** The smallest a frame gets on either side (the server holds the same floor, downloads/clip). */
+/** The smallest a frame gets on either side: the server's floor (downloads/clip), held equal by
+ * clipLimits.contract.test.ts. */
 export const MIN_CROP = 0.1;
 export const WHOLE: Frac = { x: 0, y: 0, w: 1, h: 1 };