Migrate omsorgapp to browser SPA, add Docker/CI build setup

- omsorgapp: drop Electron, run as a plain Vite/React browser app; refresh
  token moves to an HttpOnly cookie (omsorgCore), CORS added for the new
  browser origin, document download/preview switched to Blob-based browser
  APIs.
- Add Dockerfiles for omsorgCore, omsorgapp, and omsorgWeb, a docker-compose.yml
  wiring Postgres/MySQL/all three apps together, and a Gitea Actions workflow
  that builds and pushes images to the repo's container registry on push to
  main and on version tags.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

omsorgapp/src/style.css

@@ -798,6 +798,74 @@ button.omsorg-button--danger {
   margin: 0 0 18px;
 }
 
+.modal-panel--wide {
+  max-width: 1100px;
+}
+
+.modal-panel--viewer {
+  max-width: 95vw;
+  width: 95vw;
+  height: 90vh;
+  max-height: 90vh;
+  overflow: hidden;
+
+  display: flex;
+  flex-direction: column;
+  position: relative;
+}
+
+.modal-panel--viewer h2 {
+  padding-right: 40px;
+  flex-shrink: 0;
+}
+
+.document-viewer-body {
+  flex: 1;
+  min-height: 0;
+  overflow: hidden;
+
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+
+.document-viewer-content {
+  width: 100%;
+  height: 100%;
+  border: none;
+}
+
+.document-viewer-content--image {
+  width: auto;
+  height: auto;
+  max-width: 100%;
+  max-height: 100%;
+  object-fit: contain;
+}
+
+.modal-close-button {
+  position: absolute;
+  top: 20px;
+  right: 20px;
+
+  display: flex;
+  align-items: center;
+  justify-content: center;
+
+  width: 32px;
+  height: 32px;
+  padding: 0;
+  border: 1px solid var(--omsorg-border);
+  border-radius: 999px;
+  background: transparent;
+  color: inherit;
+  cursor: pointer;
+}
+
+.modal-close-button:hover {
+  background: rgba(255, 255, 255, 0.08);
+}
+
 .form-grid {
   display: grid;
   grid-template-columns: repeat(2, 1fr);
@@ -1725,6 +1793,11 @@ button.omsorg-button--danger {
   gap: 8px;
 }
 
+.settings-sort-order-controls {
+  display: flex;
+  gap: 4px;
+}
+
 .settings-roles-detail {
   flex: 1;
   min-width: 0;