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>

packages/shared/src/schemas/project.schema.ts

@@ -29,6 +29,7 @@ export const CreateProjectBaseSchema = z.object({
   blueprintId: z.string().optional(),
   status: z.nativeEnum(ProjectStatus).default(ProjectStatus.DRAFT),
   responsiblePerson: z.string().max(200).optional(),
+  color: z.string().regex(/^#[0-9a-fA-F]{6}$/, "Must be a hex color like #3b82f6").optional(),
   utilizationCategoryId: z.string().optional(),
   clientId: z.string().optional(),
 });