feat(ui): add desktop git sidebar + terminal dock and improve in-app PR workflow (#362)

* feat: add unified dropdown with services content in header

* feat: add right Git sidebar with resizable panel

* feat: implement responsive panel auto-toggle and terminal rehydration

- Auto-close the right sidebar when width is below a threshold and auto-open it when space permits
- Auto-close the bottom terminal when height is below a threshold and auto-open it when enough space
- Apply a dedicated rehydrated streaming configuration for terminal sessions to optimize reconnect behavior

* feat: enhance PR view with status caching and annotations

* feat(ui): enable chat dispatch in PullRequestSection

* feat(TerminalView): adjust layout

* feat: refine chat input layout and text selection menu

* fix(ui): show empty state in GitView when no changes

* feat(git): update PR actions styling and create PR button

packages/ui/src/index.css

@@ -549,6 +549,25 @@ html:not(.dark) .chat-scroll {
   }
 }
 
+/* Git right-sidebar header/actions collapse to icon-only when narrow. */
+@container git-header (max-width: 26rem) {
+  .git-header-label {
+    display: none;
+  }
+}
+
+/* Animated tabs: collapse labels based on local container width. */
+@container animated-tabs (max-width: 23rem) {
+  .animated-tabs__label {
+    display: none;
+  }
+
+  .animated-tabs__button {
+    padding-inline: 0.5rem;
+    gap: 0;
+  }
+}
+
 /* Text font: IBM Plex Sans */
 .streamdown-content {
   font-family: var(--font-sans);