feat(render): highlight unsaved comments and update the cues live

Completes the modified-ticket indicator (docs/modified-ticket-indicator-spec.org) on top of the field highlight and count.

A changed comment now gets its own highlight by ownership: your own comment (pushable) takes pearl-modified-highlight and bubbles up to the ticket heading; a non-own comment, which save skips, takes the muted pearl-modified-local; a comment seen before the viewer resolves takes the neutral pearl-modified-unknown until classification lands. The viewer is resolved only when a comment is actually dirty, so opening or editing a clean or field-only buffer makes no network call.

The cues update live: a buffer-local after-change hook debounces a redecorate on an idle timer (pearl-modified-idle-delay), so an edit shows within a fraction of a second instead of waiting for a save or refresh. The timer is cancelled when pearl-mode turns off or the buffer is killed. One pearl--redecorate-modified now drives the field highlights, the comment classification, and the count from a single scan, called on mode enable, fetch/refresh, and the idle tick.

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