Adds a drag-to-resize handle between the log viewer and the sections
below it in the main layout, addressing the log view being too small
with no way to enlarge it. Height is tracked in state, clamped to a
sane range, and persisted to localStorage (ottyl.logViewerHeightPx)
following the app's existing per-viewer UI-state persistence pattern
(see CollapsibleSection.tsx, LogPreview.tsx).
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XFUNZwCvz3kcod3352ZR2o
