feat(render): save the buffer to disk after a fetch or refresh

The full-replace render saved the Org file, but the in-place paths didn't, so a refresh or a comment fetch left the buffer modified-but-unsaved and the file on disk stale. Five paths now save through pearl--save-if-visiting: refresh-current-view, refresh-current-issue, fetch-all-comments, create-comment, and the merge branch of a dirty source-switch.

The helper saves only when the buffer visits a file, so it's a no-op in a test buffer. Saving the Org file never pushes to Linear, so an unpushed edit still waits for pearl-save-issue. This only keeps the disk copy in step with what's on screen. fetch-all-comments surfaced the gap first. An audit turned up the other four.

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