style: Shape Format follows the caret, and carries vertical text

The tab only showed while the box was node-selected, so it vanished the
moment you clicked in to type — the floating toolbar stayed. It now reads
findTextBox(), the same box that toolbar reads; an image selected inside a
box still shows Picture Format alone. Vertical text was the one control the
tab was missing, now a Text group of its own.

src/lib/components/ribbon/Ribbon.svelte

@@ -19,6 +19,7 @@
   import { t } from '../../i18n/i18n.svelte';
   import { withShortcut } from '../../i18n/shortcut';
   import { shortcutHint } from '../../editor/shortcuts';
+  import { findTextBox } from '../../editor/extensions/textBox';
   import { loadRibbonCollapsed, saveRibbonCollapsed, type ChromeMode, type ThemeMode } from '../../storage/theme';
   import type { StyleFamily } from '../../styles/styleSheet';
   import { DEFAULT_MARGINS, type PageMargins } from '../../storage/pageMargins';
@@ -146,17 +147,23 @@
     return sel instanceof NodeSelection ? sel.node.type.name : null;
   });
 
+  // A text box is worked on with the caret inside it just as often as with the box
+  // selected, so the tab follows the caret — the floating toolbar reads the same box.
+  let textBox = $derived.by(() => (tick >= 0 && editor ? findTextBox(editor.state) : null));
+  let inTextBox = $derived(!!textBox && selectedNode !== 'image');
+
   let frameAttrs = $derived.by<Record<string, unknown> | null>(() => {
     if (tick < 0 || !editor) return null;
     const sel = editor.state.selection;
-    return sel instanceof NodeSelection ? sel.node.attrs : null;
+    if (sel instanceof NodeSelection && !inTextBox) return sel.node.attrs;
+    return textBox?.node.attrs ?? null;
   });
 
   let shown = $derived([
     ...TABS,
     ...(inTable ? (['tableDesign', 'tableLayout'] as const) : []),
     ...(selectedNode === 'image' ? (['pictureFormat'] as const) : []),
-    ...(selectedNode === 'textBox' ? (['shapeFormat'] as const) : []),
+    ...(inTextBox ? (['shapeFormat'] as const) : []),
   ] as Tab[]);
 
   $effect(() => {
@@ -360,6 +367,7 @@
         fillColor={frameAttrs?.fillColor as string | null}
         strokeColor={frameAttrs?.strokeColor as string | null}
         strokeWidthPt={frameAttrs?.strokeWidthPt as number}
+        textVertical={frameAttrs?.textVertical === true}
       />
     {/if}
   </div>

src/lib/components/ribbon/tabs/FrameTabs.svelte

@@ -12,7 +12,7 @@
 
   // Word's Picture Format and Shape Format: the same wrap modes, plus a shape's
   // own fill, outline and kind.
-  let { editor, which, wrap, alt = '', shapeKind, fillColor, strokeColor, strokeWidthPt }: {
+  let { editor, which, wrap, alt = '', shapeKind, fillColor, strokeColor, strokeWidthPt, textVertical = false }: {
     editor: Editor | null;
     which: 'picture' | 'shape';
     wrap: WrapMode;
@@ -21,6 +21,7 @@
     fillColor?: string | null;
     strokeColor?: string | null;
     strokeWidthPt?: number;
+    textVertical?: boolean;
   } = $props();
 
   const WRAPS: { key: WrapMode; icon: 'wrapInline' | 'wrapLeft' | 'wrapRight' | 'wrapTopBottom'; label: () => string }[] = [
@@ -129,6 +130,19 @@
       />
     </label>
   </RibbonGroup>
+
+  <div class="ribbon-sep"></div>
+
+  <RibbonGroup label={t().ribbon.groups.text}>
+    <RibbonButton
+      variant="big"
+      icon="textDirection"
+      label={t().textBox.verticalText}
+      title={t().textBox.verticalText}
+      active={textVertical}
+      onclick={() => editor?.chain().focus().setTextBoxAttrs({ textVertical: !textVertical }).run()}
+    />
+  </RibbonGroup>
 {/if}
 
 <CaptionDialog bind:open={captionOpen} {editor} />