chore(release): v1.9.4 — modal UX unification + project responsible-person filter

- Unify modals: ConfirmModal now locks scroll; 8 ad-hoc modals migrated to the
  shared FormModal (consistent open/close animation, blurred backdrop, ESC,
  click-outside, scroll-lock, mobile, reduced-motion). FormModal gains
  submitDisabled + subtitle props.
- Projects: the responsible-person picker (create modal + edit page) lists only
  active users with projects.view (edit page keeps the current assignee).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "app-ts",
-  "version": "1.9.3",
+  "version": "1.9.4",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "app-ts",
-      "version": "1.9.3",
+      "version": "1.9.4",
       "license": "ISC",
       "dependencies": {
         "@dnd-kit/core": "^6.3.1",