feat(prompts): split sentinel + default-yes for safe yes/no

Two UX refinements on the just-shipped prompt surface, both following the principle "the prompt should describe what it's doing and the default should be the most-common choice."

First, the sentinel that was uniformly "[ None. ]" really meant two different things at two kinds of prompt, and the label only matched one of them. Filter-dimension prompts (team, state, project, labels, assignee) treat picking the sentinel as "no constraint on this dimension." Every value matches, which is *any*, not *none*. The saved-query prompts (delete, run) treat picking the sentinel as "don't act." That one is *cancel*, not *none* or *any*. Renamed accordingly: `pearl--filter-any` ("[ Any. ]") for the five filter dimensions and `pearl--filter-cancel` ("[ Cancel. ]") for the two saved-query prompts. The generic helper became `pearl--with-sentinel SENTINEL CANDIDATES` so each call site picks the label that fits its case. The predicate became `pearl--filter-sentinel-value-p` (recognizes either sentinel or empty/nil) so the cancellation logic is unchanged.

Second, three non-destructive yes/no prompts ("Open issues only?", "Save this filter locally...", "Save N fields across M issues?") moved from `y-or-n-p` to a new `pearl--read-yes-no` helper. The helper renders a completing-read over ("yes" "no") with the most-common choice as the default and topmost candidate, so RET takes it without typing. Default is "yes" for all three (each is a do-the-thing-I-asked confirmation), but the helper takes a DEFAULT arg so a future prompt where "no" is more common can opt in. The destructive prompts (delete issue, delete saved query, delete comment) stay as `yes-or-no-p`. Typing "yes" there is a deliberate safety affordance, not friction worth removing.

Tests cover the sentinel-value predicate across both sentinels + empty/nil + real values, the `pearl--with-sentinel` helper, the `pearl--read-yes-no` t/nil return and default-ordering behavior, and the three save-test stubs swapped to mock the new helper.

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