feat: AI assistant (HartBOT), demand filling, budget-per-role, project favorites, and UX improvements

AI Assistant (HartBOT):
- Chat panel with inline layout, session persistence, message history (up-arrow recall)
- OpenAI function calling with 20+ tools (search, navigate, create/cancel allocations, update status)
- RBAC-aware tool filtering, fuzzy search with word-level matching
- Navigation actions (router.push) and data invalidation after mutations
- Country/metro city/org unit/role filtering on resource search

Demand Filling Enhancements:
- Two-phase fill modal: plan multiple resources, then confirm & assign all at once
- Availability preview per resource (available/partial/conflict days, existing bookings)
- Coverage bar showing demand hours distribution across assigned resources
- Fill demand from project detail page (new Assign button per demand)
- Fixed: filled demands no longer shown on timeline, demand bars no longer overlap

Budget per Role:
- DemandRequirement.budgetCents field (schema + API + UI)
- Project wizard step 3: budget input per role with allocation summary bar
- Project detail: allocated vs booked budget per demand
- Fill demand modal: role budget display with cost estimates
- AllocationModal: budget field for demand editing

Project Favorites:
- User.favoriteProjectIds (JSONB) with toggle API
- Star button on projects list and detail page (optimistic updates)
- "My Projects" dashboard widget (favorites + responsible person projects)

Project Management:
- Edit project from detail page (ProjectModal integration)
- Edit demands from detail page (AllocationModal integration)
- Admin-only project deletion (cascades assignments + demands)
- Create user accounts from admin panel

Timeline Fixes:
- Country multi-select filter with backend support
- URL param sync for same-page navigation (AI assistant integration)
- Demand lane stacking (no more overlapping bars)
- Single-day booking resize handles (always visible, min 6px)
- Single-day resize allowed (start === end)
- "All Clients" toggle (select all / deselect all)

Other Fixes:
- crypto.randomUUID fallback for non-secure contexts
- Chat message limit raised (200 max, client sends last 40)
- Status dropdown portal (no longer clipped by table overflow)
- Cents display restored in budget views (2 decimal places)
- Allocations grouped view with project sub-groups (collapsed by default)
- Server-side resource search for project wizard (no 500 limit)

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

packages/api/src/router/user.ts

@@ -113,6 +113,33 @@ export const userRouter = createTRPCRouter({
       return { updatedAt: updated.updatedAt };
     }),
 
+  // ─── Favorite Projects ──────────────────────────────────────────────────
+  getFavoriteProjectIds: protectedProcedure.query(async ({ ctx }) => {
+    const user = await ctx.db.user.findUnique({
+      where: { id: ctx.dbUser!.id },
+      select: { favoriteProjectIds: true },
+    });
+    return ((user?.favoriteProjectIds as string[] | null) ?? []) as string[];
+  }),
+
+  toggleFavoriteProject: protectedProcedure
+    .input(z.object({ projectId: z.string() }))
+    .mutation(async ({ ctx, input }) => {
+      const user = await ctx.db.user.findUnique({
+        where: { id: ctx.dbUser!.id },
+        select: { favoriteProjectIds: true },
+      });
+      const current = ((user?.favoriteProjectIds as string[] | null) ?? []) as string[];
+      const next = current.includes(input.projectId)
+        ? current.filter((id) => id !== input.projectId)
+        : [...current, input.projectId];
+      await ctx.db.user.update({
+        where: { id: ctx.dbUser!.id },
+        data: { favoriteProjectIds: next as unknown as Prisma.InputJsonValue },
+      });
+      return { favoriteProjectIds: next, added: !current.includes(input.projectId) };
+    }),
+
   setPermissions: adminProcedure
     .input(
       z.object({