fix: silence state_referenced_locally warning + sync draft model on catalog fetch

- Use DEFAULT_MODEL directly when creating the initial draft store instead
  of reading the $state activeModel in a non-reactive context (init-time
  read only captures the initial value — semantically identical since
  activeModel === DEFAULT_MODEL at that point, but silences the Svelte
  state_referenced_locally warning).
- Sync the draft store's model when the model catalog fetch corrects
  activeModel (default not in catalog). Without this, chat.send would use
  the stale DEFAULT_MODEL while the UI showed the corrected model.

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