diff --git a/frontend/src/assets/icons.generated.js b/frontend/src/assets/icons.generated.js
index c2aaa1f16..b95dd51f6 100644
--- a/frontend/src/assets/icons.generated.js
+++ b/frontend/src/assets/icons.generated.js
@@ -5,7 +5,7 @@
   never waits on (or depends on) the icon service. Regenerate with `npm run icons` after adding or
   removing an icon; `check-icons.mjs` fails the build if this drifts.
 
-  259 icons.
+  260 icons.
 */
 export const BUNDLED_ICONS = {
   "la:angle-double-right": {"body":"<path fill=\"currentColor\" d=\"M9.094 4.781L7.688 6.22l9.78 9.78l-9.78 9.781l1.406 1.438L20.313 16zm7 0L14.687 6.22L24.47 16l-9.782 9.781l1.407 1.438L27.312 16z\"/>","width":32,"height":32},
@@ -266,5 +266,6 @@ export const BUNDLED_ICONS = {
   "mdi:transfer-down": {"body":"<path fill=\"currentColor\" d=\"M16 3v2H8V3zm0 4v2H8V7zm0 4v2H8v-2zM5 15h14l-7 7z\"/>","width":24,"height":24},
   "mdi:transfer-up": {"body":"<path fill=\"currentColor\" d=\"M8 21v-2h8v2zm0-4v-2h8v2zm0-4v-2h8v2zm11-4H5l7-7z\"/>","width":24,"height":24},
   "mdi:undo-variant": {"body":"<path fill=\"currentColor\" d=\"M13.5 7a6.5 6.5 0 0 1 6.5 6.5a6.5 6.5 0 0 1-6.5 6.5H10v-2h3.5c2.5 0 4.5-2 4.5-4.5S16 9 13.5 9H7.83l3.08 3.09L9.5 13.5L4 8l5.5-5.5l1.42 1.41L7.83 7zM6 18h2v2H6z\"/>","width":24,"height":24},
+  "mdi:view-split-vertical": {"body":"<path fill=\"currentColor\" d=\"M13 5h8v14h-8zM3 5h8v2H3zm0 6V9h8v2zm0 8v-2h8v2zm0-4v-2h8v2z\"/>","width":24,"height":24},
   "mdi:web": {"body":"<path fill=\"currentColor\" d=\"M16.36 14c.08-.66.14-1.32.14-2s-.06-1.34-.14-2h3.38c.16.64.26 1.31.26 2s-.1 1.36-.26 2m-5.15 5.56c.6-1.11 1.06-2.31 1.38-3.56h2.95a8.03 8.03 0 0 1-4.33 3.56M14.34 14H9.66c-.1-.66-.16-1.32-.16-2s.06-1.35.16-2h4.68c.09.65.16 1.32.16 2s-.07 1.34-.16 2M12 19.96c-.83-1.2-1.5-2.53-1.91-3.96h3.82c-.41 1.43-1.08 2.76-1.91 3.96M8 8H5.08A7.92 7.92 0 0 1 9.4 4.44C8.8 5.55 8.35 6.75 8 8m-2.92 8H8c.35 1.25.8 2.45 1.4 3.56A8 8 0 0 1 5.08 16m-.82-2C4.1 13.36 4 12.69 4 12s.1-1.36.26-2h3.38c-.08.66-.14 1.32-.14 2s.06 1.34.14 2M12 4.03c.83 1.2 1.5 2.54 1.91 3.97h-3.82c.41-1.43 1.08-2.77 1.91-3.97M18.92 8h-2.95a15.7 15.7 0 0 0-1.38-3.56c1.84.63 3.37 1.9 4.33 3.56M12 2C6.47 2 2 6.5 2 12a10 10 0 0 0 10 10a10 10 0 0 0 10-10A10 10 0 0 0 12 2\"/>","width":24,"height":24}
 }
diff --git a/frontend/src/components/EditorMarkdown.vue b/frontend/src/components/EditorMarkdown.vue
index 1b5e1944f..d73a93a28 100644
--- a/frontend/src/components/EditorMarkdown.vue
+++ b/frontend/src/components/EditorMarkdown.vue
@@ -233,6 +233,19 @@
               t('editor.markup.keyboardKey')
             }}</w-tooltip>
           </w-btn>
+          <!-- -> The only way back once the preview is closed: its own toggle goes with it -->
+          <template v-if="!state.previewShown">
+            <w-space />
+            <w-btn
+              icon="mdi:view-split-vertical"
+              padding="xs sm"
+              flat
+              @click="state.previewShown = true">
+              <w-tooltip anchor="top middle" self="bottom middle">{{
+                t('editor.togglePreviewPane')
+              }}</w-tooltip>
+            </w-btn>
+          </template>
         </div>
         <!-- ------------------------------------------------------- -->
         <!-- MONACO EDITOR -->
@@ -857,10 +870,6 @@ function processContent(newContent) {
   })
 }
 
-function openEditorSettings() {
-  siteStore.$patch({ overlay: 'EditorMarkdownConfig' })
-}
-
 /**
  * Take files the author brought in — pasted or dropped — and write markdown for them at the cursor.
  *
@@ -1203,7 +1212,6 @@ onMounted(async () => {
   EVENT_BUS.on('insertAsset', insertAssetClb)
   EVENT_BUS.on('insertTable', insertTableClb)
   EVENT_BUS.on('insertBlock', insertBlockClb)
-  EVENT_BUS.on('openEditorSettings', openEditorSettings)
   EVENT_BUS.on('reloadEditorContent', reloadEditorContent)
 
   // this.$root.$on('editorInsert', opts => {
@@ -1243,7 +1251,6 @@ onBeforeUnmount(() => {
   EVENT_BUS.off('insertAsset', insertAssetClb)
   EVENT_BUS.off('insertTable', insertTableClb)
   EVENT_BUS.off('insertBlock', insertBlockClb)
-  EVENT_BUS.off('openEditorSettings', openEditorSettings)
   EVENT_BUS.off('reloadEditorContent', reloadEditorContent)
   pasteCaptureNode?.removeEventListener('paste', onEditorPaste, true)
   monacoRef.value?.removeEventListener('dragover', onEditorDragOver)
@@ -1283,6 +1290,14 @@ $editor-height-mobile: calc(100vh - 112px - 16px);
     height: $editor-height;
     position: relative;
     border-right: 5px solid $primary;
+    /*
+      Monaco writes its measured width in pixels onto its own elements, so this item's automatic
+      min-width -- min-content, i.e. whatever Monaco last laid itself out at -- pins it to the full
+      width it took while the preview was closed. Bringing the preview back then leaves it the few
+      pixels the flex line has left over, and Monaco never re-measures because its container never
+      shrinks. Zero lets the basis decide instead.
+    */
+    min-width: 0;
   }
   &-editor {
     display: block;
@@ -1318,16 +1333,21 @@ $editor-height-mobile: calc(100vh - 112px - 16px);
     // @include until($tablet) {
     //   display: none;
     // }
+    /*
+      `-enter-from` is the Vue 3 name; as `-enter` it matched nothing, so the pane animated shut but
+      snapped open. The inner selector was stale in the same way -- the content class is
+      `-preview-content` -- which left the render reflowing for the length of the transition.
+    */
     &-enter-active,
     &-leave-active {
       transition: max-width 0.5s ease;
       max-width: 50vw;
-      .editor-code-preview-content {
+      .editor-markdown-preview-content {
         width: 50vw;
         overflow: hidden;
       }
     }
-    &-enter,
+    &-enter-from,
     &-leave-to {
       max-width: 0;
     }
@@ -1445,6 +1465,9 @@ $editor-height-mobile: calc(100vh - 112px - 16px);
     border-left: 60px solid color.adjust($primary, $lightness: -5%);
     color: #fff;
     height: 32px;
+    // -> Flex so the preview toggle can be pushed to the far right by `w-space`
+    display: flex;
+    align-items: center;
   }
   &-sidebar {
     background-color: $dark-4;
diff --git a/frontend/src/components/PageHeader.vue b/frontend/src/components/PageHeader.vue
index e7cd39d28..880628977 100644
--- a/frontend/src/components/PageHeader.vue
+++ b/frontend/src/components/PageHeader.vue
@@ -197,15 +197,6 @@
           type="a">
           <w-tooltip>{{ t(`common.actions.viewDocs`) }}</w-tooltip>
         </w-btn>
-        <w-btn
-          class="ml-2 acrylic-btn"
-          icon="la:cog"
-          flat
-          color="grey"
-          :aria-label="t(`editor.settings`)"
-          @click="openEditorSettings">
-          <w-tooltip>{{ t(`editor.settings`) }}</w-tooltip>
-        </w-btn>
       </template>
       <!--
         Not `v-else-if` on the block below: changes made from the page properties panel put the header
@@ -462,10 +453,6 @@ function onEditableBlur(field, event) {
   syncEditable(event.target, tidied)
 }
 
-function openEditorSettings() {
-  EVENT_BUS.emit('openEditorSettings')
-}
-
 async function discardChanges() {
   // From create mode
   if (editorStore.mode === 'create') {
diff --git a/frontend/src/css/_page-contents.scss b/frontend/src/css/_page-contents.scss
index d194fbbb3..d40530ef8 100644
--- a/frontend/src/css/_page-contents.scss
+++ b/frontend/src/css/_page-contents.scss
@@ -76,6 +76,11 @@
 
   --content-mark: #fdf1a0;
 
+  /* The box behind the tick of a done task-list item; the tick itself is white in both themes */
+  --content-tick: #5b616b;
+  /* -> And the empty box of an item still to do, white whatever surface the content sits on */
+  --content-tick-empty: #fff;
+
   /* Admonition hues: the bar and the wash behind it, per severity */
   --content-info: #1867c0;
   --content-info-wash: rgba(24, 103, 192, 0.08);
@@ -153,6 +158,14 @@
 
     --content-mark: #6b5d13;
 
+    /*
+      Lighter than the light theme's, because the box has to be seen against a dark page -- but held
+      well below the white of the tick on it, which is what makes the tick readable.
+    */
+    --content-tick: rgba(255, 255, 255, 0.38);
+    /* -> A white box would be a lit square on a dark page; the empty one is just its outline */
+    --content-tick-empty: transparent;
+
     --content-info: #6ab0ff;
     --content-info-wash: rgba(106, 176, 255, 0.12);
     --content-success: #4ecf9a;
@@ -588,16 +601,53 @@
   /*
     Laid out inline rather than as a flex row: a task item can contain a nested list, and as a flex
     child that list would sit BESIDE the text instead of under it.
+
+    Drawn here rather than left to the browser, and NOT with `accent-color`: the renderer marks these
+    inputs disabled, and a disabled checkbox ignores `accent-color` entirely -- Chrome paints it its
+    own washed-out grey, which is the pale tick this replaces. `appearance: none` is what gets the
+    box back under this stylesheet's control; the tick then has to be drawn too, since the one the
+    browser supplies goes with the appearance.
   */
   .task-list-item-checkbox {
+    /*
+      The prefixed form is for Safari before 15.4, which is the last engine that will not take the
+      unprefixed one -- and which without it draws its own rounded box UNDER these rules, so the
+      border and the fill land on a control that is still the platform's.
+    */
+    -webkit-appearance: none;
+    appearance: none;
+    /* -> So the box measures 1em in every engine rather than 1em plus whatever the UA pads it by */
+    box-sizing: border-box;
     width: 1em;
     height: 1em;
+    /* -> Firefox gives a checkbox 3px of its own margin, Chrome 3px 3px 3px 4px */
     margin: 0 0.5em 0 0;
-    accent-color: var(--color-primary);
+    padding: 0;
+    border: 1px solid var(--content-rule-strong);
+    border-radius: 3px;
+    /* -> White rather than the surface behind it, so the box reads as empty and not as unfilled */
+    background-color: var(--content-tick-empty);
     /* -> Disabled by the renderer, so it must not read as something to try to click */
     cursor: default;
+    /* -> Safari and Firefox both dim a disabled control; here it is a mark, not a dead input */
     opacity: 1;
     vertical-align: -0.1em;
+
+    /*
+      A done item: a filled box with the tick laid over it. White in both themes -- the dark theme
+      lightens the box rather than the tick, so this one mark works on either.
+    */
+    &:checked {
+      border-color: transparent;
+      background-color: var(--content-tick);
+      background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath fill='none' stroke='%23fff' stroke-width='3.2' stroke-linecap='round' stroke-linejoin='round' d='M5 12.5l4.5 4.5L19 7'/%3E%3C/svg%3E");
+      background-repeat: no-repeat;
+      background-position: center;
+      background-size: 0.8em 0.8em;
+      /* -> Print drops background fills, and a done item that prints as an empty box says the opposite */
+      print-color-adjust: exact;
+      -webkit-print-color-adjust: exact;
+    }
   }
 
   /*
@@ -1091,6 +1141,18 @@
     vertical-align: middle;
   }
 
+  /*
+    An image in a list item stays in the sentence. Tailwind's preflight declares `img { display:
+    block }`, so without this the image takes a line of its own and the item's own words go under it,
+    which reads as a broken item rather than as an illustrated one.
+
+    `align-left` / `align-right` / `align-center` still win on specificity, so an author who asks for
+    one of those in a list still gets it.
+  */
+  li img {
+    display: inline-block;
+  }
+
   /* The alignment classes an author can attach through `markdown-it-attrs` */
   img,
   figure {
diff --git a/frontend/src/renderers/markdown.js b/frontend/src/renderers/markdown.js
index 301fea9f0..b2fca44c5 100644
--- a/frontend/src/renderers/markdown.js
+++ b/frontend/src/renderers/markdown.js
@@ -169,6 +169,36 @@ export class MarkdownRenderer {
       return inlineSpan(state, silent)
     })
 
+    /*
+      MDC's inline props, `{.class}`, and `markdown-it-attrs` both claim `{`, and MDC gets there first
+      — it runs while the inline is being parsed, `markdown-it-attrs` in a core rule afterwards, so
+      whatever MDC takes is already gone by the time the braces would have become attributes.
+
+      That is what made `{.is-warning}` on the line under a blockquote do nothing at all: the braces
+      were eaten and the class never reached the element. The same collision crashed the render
+      outright — `Cannot read properties of undefined (reading 'tag')` out of MDC's own renderer —
+      when the braces opened an inline, since the props it parsed then had no node to attach to. In
+      the editor that reads as the preview freezing on the last good render, and a save then storing
+      that stale HTML.
+
+      The two are told apart by what comes before the brace, which is also what each one means by it:
+      MDC's props decorate the thing they are stuck to (`[text]{.cls}`, `![img](…){.cls}`), while a
+      brace opening a line, or standing off behind a space, is `markdown-it-attrs` addressing the
+      block as a whole. So MDC keeps every brace that abuts a preceding character and lets the rest
+      fall through to the core rule.
+    */
+    const propsRule = this.md.inline.ruler.__rules__.find(
+      (rule) => rule.name === 'mdc_inline_props'
+    )
+    const inlineProps = propsRule.fn
+    this.md.inline.ruler.at('mdc_inline_props', (state, silent) => {
+      const preceding = state.src[state.pos - 1]
+      if (preceding === undefined || /\s/.test(preceding)) {
+        return false
+      }
+      return inlineProps(state, silent)
+    })
+
     if (config.underline) {
       this.md.use(mdUnderline)
     }