sl0p: refresh snapshots for the compact scroll indicator

aa51848d replaced "SCROLL: 42/1000" with a compact "^42" glyph and stopped
showing any indicator when the pane is not actually scrolled up, but did not
refresh the insta snapshots that encode the old upstream frame rendering.
That left 30 failing tests in zellij-server from the very first sl0p commit
onward, which in turn masked 5 more in zellij-utils (cargo stops at the first
failing test binary, so zellij-utils never ran).

Bisected to aa51848d; the upstream fork point 0e6e4404 is green.

zellij-server (44 snapshots): frame titles lose the "SCROLL: 0/N" segment when
not scrolled, and render "^N" where they previously rendered "SCROLL: N/M".
Verified every diff is scroll-only, and that the genuinely-scrolled cases
(2/13, 3/33, 6/33) still render as ^2, ^3 and ^6 rather than disappearing.

zellij-utils (5 snapshots): serialized Config gained the sl0p FrameConfig
fields (title_alignment, gap, padding, gap_aspect, inactive_grayscale,
hide_default_pane_names), all at their existing defaults. Additions only.

Several tests assert multiple snapshots and insta aborts at the first
mismatch, so this took four regenerate/verify passes to fully converge.

zellij-server: 1471 passed, 0 failed.
zellij-utils:   441 passed, 0 failed.

0 files changed, 0 insertions, 0 deletions