feat: project colors, timeline filters, sidebar fix, GitLooper agent, and misc improvements

- Fix sidebar double-highlight on /vacations/my (Gitea #6): add isNavItemActive() helper
- Add project color picker (schema + API + modal + timeline rendering)
- Add ProjectCombobox/ResourceCombobox to timeline toolbar
- Show PENDING vacations on timeline with dashed/dimmed style
- Add "show demand projects" preference with localStorage persistence
- Add ProjectAssignmentsTable with total hours/cost columns
- Extend vacation API to accept status arrays
- Add GitLooper formal YAML agent configuration
- Extend user admin with permission overrides UI
- Add delete-assignment use case tests
- Add status-styles.ts shared badge constants
- Centralize formatMoney/formatCents in format.ts

Co-Authored-By: claude-flow <ruv@ruv.net>

apps/web/src/hooks/useAppPreferences.ts

@@ -16,6 +16,8 @@ export interface AppPreferences {
   timelineDisplayMode: "strip" | "bar" | "heatmap";
   /** Color palette used for heatmap overlays and bar-mode project view bars. */
   heatmapColorScheme: HeatmapColorScheme;
+  /** Show open demand / placeholder entries by default when loading the timeline. Default: true. */
+  showDemandProjects: boolean;
 }
 
 const STORAGE_KEY = "planarchy_prefs";
@@ -25,6 +27,7 @@ const DEFAULT: AppPreferences = {
   hideCompletedProjects: true,
   timelineDisplayMode: "strip",
   heatmapColorScheme: "green-red",
+  showDemandProjects: true,
 };
 
 export function readAppPreferences(): AppPreferences {
@@ -83,5 +86,13 @@ export function useAppPreferences() {
     });
   }, []);
 
-  return { prefs, setHideCompletedProjects, setTimelineDisplayMode, setHeatmapColorScheme };
+  const setShowDemandProjects = useCallback((value: boolean) => {
+    setPrefs((prev) => {
+      const next = { ...prev, showDemandProjects: value };
+      saveAppPreferences(next);
+      return next;
+    });
+  }, []);
+
+  return { prefs, setHideCompletedProjects, setTimelineDisplayMode, setHeatmapColorScheme, setShowDemandProjects };
 }