A side menu, categories, and a store switcher

Everything that is not a title moved out of the bar into a menu on the left that
folds away with the button in the bar; the state is remembered between runs. It
carries the stores on this machine, the two actions, the categories and the
language.

Categories narrow the grid one at a time, with counts: the state of a title on
this machine, then a row per platform and per kind. The axes are built from what
the catalog contains — a WarpEngine catalog has no genre — and a category that
disappears under you falls back to Everything rather than leaving a blank grid.

With more than one store installed, clicking another in the menu opens it: the
grid, the categories and the folders follow, the choice is remembered, and stores
sharing an id are told apart by their folder. app:state now reports every store,
store:use switches, and the engine is re-checked per store because two stores can
be at different versions.

While the CLI runs, the menu, the log drawer and the filters stay live; only what
would start a second call is disabled.

Fixes the grid, which was broken and passing every check: its implicit rows split
the window's height evenly instead of following their content, so every card came
out 94px tall with its box art collapsed to nothing and its buttons clipped away.
The DOM was intact throughout — ten cards, twenty buttons — which is exactly why
the counts said nothing. Rows are content-sized now, and the art is one band of
one height, with the title's first letter where the catalog has no image.

So the window is looked at and not only counted, `SELFTEST_SHOT` has it
photograph itself; the terminal has no screen-recording permission here. The
selftest also clicks the store that is not open when there are two, and checks
that the bar, the grid and the categories follow.

Also fixes scripts/release.sh, which could not upload a package whose name has a
space in it — "WarpEngine Store-1.1.0-arm64.dmg" does — because the list was one
string split on whitespace. And `make release` cleans dist/ first, so a release
cannot pick up the previous version's artifacts.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

preload.js

@@ -7,11 +7,13 @@ const { contextBridge, ipcRenderer } = require('electron')
 contextBridge.exposeInMainWorld('storeApi', {
   state: () => ipcRenderer.invoke('app:state'),
   setLocale: (locale) => ipcRenderer.invoke('app:setLocale', locale),
+  setNav: (open) => ipcRenderer.invoke('app:setNav', open),
 
   list: () => ipcRenderer.invoke('store:list'),
   paths: () => ipcRenderer.invoke('store:paths'),
   sync: (names) => ipcRenderer.invoke('store:sync', names),
   remove: (name) => ipcRenderer.invoke('store:remove', name),
+  use: (home) => ipcRenderer.invoke('store:use', home),
   registry: () => ipcRenderer.invoke('store:registry'),
   bootstrap: (store) => ipcRenderer.invoke('store:bootstrap', store),
   launch: (game) => ipcRenderer.invoke('store:launch', game),