Root cause (issues: unscrollable list + half-blocked moon): the stacked
welcome layout gave the menu one Length row per item. With ~30 advertised
providers the vertical layout overflowed and the constraint solver
squeezed every Length — clipping the logo — while rows past the fold were
silently unreachable.
- WelcomeLayout::compute_inner caps the menu to the rows genuinely left
over after logo/prompt/version, so the chrome never gets squeezed.
- render_menu is now a minimal-scroll viewport: it scrolls only when the
selection exits it (stable under hover — no re-centering feedback
loop), draws the picker-style scrollbar, and returns index-aligned hit
rects (zero Rect for off-screen rows) plus the offset, which AppView
feeds back next frame.
- Mouse wheel moves the login-picker selection (clamped, not wrapping).
Test: pending_menu_scrolls_and_never_clips_the_moon renders the full
method list at 40 rows and asserts the whole moon (10 braille rows), the
version badge, and that selecting Quit scrolls it into view.
Verified: kigi-tui 6864 tests green, clippy clean.
ZacharyZhang-NY
c2d1067f0d