Fix command palette over focused scratchpad

The stdin loop's scratchpad-input branch ran before the palette branch
and silently dropped every byte except a handful of app-level chords,
so palette typing and Esc never reached the palette while a pad was
focused. Skip the pad-input branch whenever st.palette != nil.

closePalette also called repaintFocused() on cancel / no-op action
paths, which paints the empty focused-child slot (focusedID == "" while
a pad is focused) and leaves the palette's top border drawn over the
pad. Route those branches through a restoreView helper that picks
repaintFocusedPad when a pad is focused.

Switching from a pad to a child via the palette now clears the pad
focus and wipes the viewport, matching focusProcess's pad-exit path.

Adds a harness scenario (palette_over_scratchpad) that opens a pad,
opens the palette, types a query, and verifies that Esc leaves the
pad correctly repainted with no palette chrome lingering.

CHANGELOG.md

@@ -63,6 +63,17 @@ loosely follows [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
   renders the canonical `--flag` form.
 
 ### Fixed
+- Opening the command palette while a scratchpad was focused left the
+  palette wedged — typing did nothing and Esc left the palette's top
+  border drawn over the pad until you closed the pad with Ctrl-W and
+  re-opened the palette. The stdin loop's scratchpad-input branch ran
+  before the palette branch and silently dropped every byte except a
+  handful of app-level chords, so palette filter input and Esc never
+  reached `palette.handleInput`. The palette branch now takes
+  precedence whenever the palette is open, and `closePalette` repaints
+  the pad (instead of the empty focused-child slot) on cancel / no-op
+  action. Switching from a pad to a child via the palette now clears
+  the pad focus and wipes the viewport, matching `focusProcess`.
 - Tab bar and bottom status row no longer get overwritten by long
   claude / codex sessions. Three holes were letting child output land
   on the chrome: (1) absolute cursor moves — CUP / HVP / VPA — added