fix(directory-explorer): gate Space toggle on browse position; reorder batch path

Two blockers from the openchamber-bot review:

1. Space swallowed in the path input. The handler at
handleKeyDown was calling preventDefault on every Space,
turning paths with spaces into no-op strokes and toggling the
highlighted row instead. Gate the toggle on hasTrailingPathSeparator
(query) so Space is a literal character when the user is typing
a path or filter and only acts as a selection toggle when they
have navigated into a directory.

2. Batch path was unreachable when the filter had no exact match.
With checkboxes ticked and a typed filter that has no exact match,
shouldCreateTarget evaluated true and the primary action (Add
selected) called createDirectory for the typed text instead of
adding the selections. Move the batch branch above
shouldCreateSelection so explicit selections always win over the
single-target create path. Drop the trailing else-if (now
unreachable) which also lost { asProject: true }.

packages/ui/src/components/session/DirectoryExplorerDialog.tsx

@@ -482,9 +482,10 @@ export const DirectoryExplorerDialog: React.FC<DirectoryExplorerDialogProps> = (
           gitIdentityId: selectedGitIdentity?.id ?? null,
         });
         selectedTarget = result.path;
-      } else if (shouldCreateSelection) {
-        await opencodeClient.createDirectory(target, { asProject: true });
       } else if (selectionToAdd.length > 0) {
+        // Batch path wins over single-target create: with checkboxes ticked,
+        // the user wants the selections added, not a fresh directory created
+        // for whatever happens to be typed in the filter.
         const added = addProjects(selectionToAdd);
         if (added.length === 0) {
           toast.error(t('directoryExplorerDialog.toast.failedToAddProject'), {
@@ -495,8 +496,8 @@ export const DirectoryExplorerDialog: React.FC<DirectoryExplorerDialogProps> = (
         setSelectedPaths([]);
         handleClose();
         return;
-      } else if (shouldCreateTarget && normalizeDirectoryPath(target) === normalizeDirectoryPath(targetPath)) {
-        await opencodeClient.createDirectory(target);
+      } else if (shouldCreateSelection) {
+        await opencodeClient.createDirectory(target, { asProject: true });
       }
       const project = await addProject(selectedTarget);
       if (!project) {
@@ -576,9 +577,16 @@ export const DirectoryExplorerDialog: React.FC<DirectoryExplorerDialogProps> = (
       return;
     }
     if (event.key === ' ') {
-      event.preventDefault();
-      if (highlightedRow && highlightedRow.type === 'directory' && !highlightedRow.disabled) {
-        togglePathSelection(highlightedRow.path);
+      // Only treat Space as a selection toggle when the user is actively
+      // browsing a directory (trailing slash or no filter typing). When
+      // the input is in path-entry mode, Space is a literal character
+      // and must reach the input value.
+      if (hasTrailingPathSeparator(query)) {
+        event.preventDefault();
+        if (highlightedRow && highlightedRow.type === 'directory' && !highlightedRow.disabled) {
+          togglePathSelection(highlightedRow.path);
+        }
+        return;
       }
       return;
     }