fix(view,panel): the composer clears the navbar and the keyboard, panel opens on the master

The inset only knew the desktop status bar, so on a phone the composer sat
under the navbar - which paints over a leaf instead of shortening it - and
the software keyboard hid it outright. Every bottom bar is measured now, and
the keyboard is read off `visualViewport`: it shrinks the visible area
without resizing the layout, so no workspace event fires and the panel had
no way to know. Focus re-measures once iOS has finished animating the keys in.

The panel asks the shell to fall back to the latest master, so opening it on
a phone lands in the day's thread rather than on a prompt.

The preview fixtures anchor at midday instead of the wall clock: spread over
hours, a run just after midnight pushed half of them into yesterday and
emptied the "Today" group the switcher smoke checks.

preview/fake-client.ts

@@ -8,7 +8,12 @@ import type {
 
 const MINUTE = 60_000;
 const HOUR = 60 * MINUTE;
-const now = Date.now();
+// Anchored inside the day rather than at the wall clock: the fixtures are
+// spread over hours, and a run just after midnight would push half of them
+// into yesterday and empty the "Today" group the rail is checked against.
+const wall = new Date();
+const now =
+  wall.getHours() < 12 ? new Date(wall).setHours(12, 0, 0, 0) : wall.getTime();
 const ago = (ms: number) => new Date(now - ms).toISOString();
 
 export const MASTER = "c1master0000";