Capital Planning: add Unscheduled bucket for imported projects without target_year

Projects imported via CSV that lack a target_year were invisible in Capital
Planning because findForPlanning() filtered on target_year IS NOT NULL. This
removes that filter and adds an "Unscheduled" Kanban column (orange background,
2-col layout) so users can drag unscheduled projects into year buckets.
Also bumps app version to 2026.3.2 (beta).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/pages/settings/SettingsPage.tsx

@@ -117,7 +117,7 @@ export function SettingsPage() {
             </Group>
             <Group justify="space-between">
               <Text size="sm" c="dimmed">Version</Text>
-              <Badge variant="light">0.2.0 MVP_P2</Badge>
+              <Badge variant="light">2026.3.2 (beta)</Badge>
             </Group>
             <Group justify="space-between">
               <Text size="sm" c="dimmed">API</Text>