Large pastes collapse to a placeholder in the composer, but input history
stored the placeholder — so up-arrow recall showed a truncated reference
(CLI) or lost the content entirely (TUI, where the `[[…]]` label has no
backing snip after submit).
Store the expanded content in history instead:
- CLI: `_inline_pastes()` expands `[Pasted text #N -> file]` into the buffer
before `reset(append_to_history=True)`; also reused by the external editor
(dedup). History nav suppresses re-collapse of recalled content.
- TUI: `dispatchSubmission` pushes `expandSnips(pasteSnips)(full)`; idempotent
on label-free text so re-submitting a recalled entry stays stable.
