ISpooferMotion v2.5.8

Fix half-replaced animations + clearer error messages (v2.5.8)

- plugin: scan AnimationContent alongside AnimationId. Roblox's runtime
  reads whichever is set, so patching only AnimationId left
  AnimationContent pointing at the original and the character played
  the un-spoofed animation. The daemon patcher already handles Content
  values -- just needed the scanner to capture the property.
- messages: auto-triage when a whole job fails, replace "successfully
  resolved metadata for 0 assets" with a real warning, differentiate
  "blocked by Roblox" from "private", humanize "error decoding
  response body", fix the "a Animation" grammar, and make the
  "auto-replacement queued" line honest about needing the plugin
  loaded in Studio.
- plugin version bumped to 2.5.8 to match app.