spotlight on shift+space, overriding both of its stock behaviours

Fifth setting in three days: ctrl-space → shift-space → alt-space → ctrl-space → shift-space. Ctrl-space was
tried twice on the theory that preventDefault would beat Brave's address bar. It does not — that binding is
at the browser level and the key never reaches the handler. Recorded in the file so it is not tried a third
time.

Shift-space overrides two stock behaviours deliberately, and the owner's reasoning is the right one: it types
a space in a text field, and it scrolls a page UP when nothing has focus. Neither is worth a launcher.
Page-up-by-shift-space is a fossil, and typing a space is what the unmodified spacebar is for.

The cost is stated once in the file rather than argued again: typing in CAPS by holding shift instead of
using caps lock puts a shift-space between every word, which opens the launcher mid-sentence. If that turns
out to bite, the fix is a text-field guard — which this had for one day, and which is exactly what made the
launcher unopenable from the composer, where it is most wanted. Trading that back would be trading down.

Every other modifier must be absent: ctrl+shift+space is the theme browser, and one chord opening both is
the bug that needed a capture-phase listener to fix. Verified disjoint in the built bundle, both conditions
quoted from it rather than from the source.

Five moves in three days is the argument for making chords configurable rather than for choosing better ones,
which is why the ctrl+? registry names the implementing file for each.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/apps/officer-web/state/shortcuts.ts

@@ -39,7 +39,7 @@ export const SHORTCUT_SECTIONS: ShortcutSection[] = [
     title: 'Navigation',
     shortcuts: [
       {
-        keys: 'Ctrl+Space',
+        keys: 'Shift+Space',
         description: 'Spotlight — go to any screen, plugin or setting by name',
         implementedIn: 'Layout/Spotlight/Spotlight.tsx',
       },