fix(renderer): normalize editor line-height to 1.0; add chapter-view export dropdown

- Set .folio-prose.ProseMirror line-height from 1.7 to 1.0 to fix
  excessive spacing between paragraphs and blockquotes
- Add PDF/DOCX/ODT export dropdown to the chapter writing view header,
  matching the Full Book view's export workflow
- Wire chapter export dropdown toggle, menu selection, and close-on-outside-click

src/renderer/book/editor.ts

@@ -30,7 +30,7 @@ import {
 export interface EditorFeature {
   editor: Editor;
   selectChapter(id: string): Promise<void>;
-  saveCurrentChapter(): Promise<void>;
+  saveCurrentChapter(): Promise<boolean>;
   saveAndNotify(): Promise<void>;
   flushAutosave(): Promise<void>;
   clearTimers(): void;
@@ -65,18 +65,25 @@ export function createEditorFeature(ctx: BookCtx): EditorFeature {
 
   function clearTimers() {
     if (saveTimer) { clearTimeout(saveTimer); saveTimer = null; }
+    stopForcedAutosave();
   }
 
-  async function saveCurrentChapter(): Promise<void> {
-    if (!state.selectedId) return;
+  async function saveCurrentChapter(): Promise<boolean> {
+    if (!state.selectedId) return false;
     clearTimers();
+    saveStateEl.textContent = "Saving…";
+    saveStateEl.classList.remove("unsaved", "failed");
     const res = await api.saveChapterDoc(state.selectedId, getEditorDoc(editor));
-    if (!(res && "error" in res)) {
-      state.loadedDocJson = JSON.stringify(getEditorDoc(editor));
-      state.dirty = false;
-      saveStateEl.textContent = "Saved";
-      saveStateEl.classList.remove("unsaved");
+    if (res && "error" in res) {
+      saveStateEl.textContent = "Failed";
+      saveStateEl.classList.add("failed");
+      return false;
     }
+    state.loadedDocJson = JSON.stringify(getEditorDoc(editor));
+    state.dirty = false;
+    saveStateEl.textContent = "Saved";
+    saveStateEl.classList.remove("unsaved", "failed");
+    return true;
   }
 
   // Explicit save (Ctrl/Cmd+S or menu) — always give visible feedback.
@@ -89,8 +96,8 @@ export function createEditorFeature(ctx: BookCtx): EditorFeature {
       showToast(state.currentBook ? "Nothing to save" : "Nothing to save");
       return;
     }
-    await saveCurrentChapter();
-    showToast("Saved");
+    const ok = await saveCurrentChapter();
+    showToast(ok ? "Saved" : "Save failed — check disk space/permissions");
   }
 
   // Guards against overlapping selections: rapid clicks (or metadata
@@ -132,10 +139,11 @@ export function createEditorFeature(ctx: BookCtx): EditorFeature {
     state.loadedDocJson = JSON.stringify(getEditorDoc(editor));
     state.dirty = false;
     saveStateEl.textContent = "Saved";
-    saveStateEl.classList.remove("unsaved");
+    saveStateEl.classList.remove("unsaved", "failed");
     $("wordCount").textContent = formatWordCount(editor.getText());
     editor.commands.focus("end");
     clearTimers();
+    startForcedAutosave();
     $("fullBookBtn").classList.remove("active");
     $("fullBookView").classList.add("hidden");
     showView($("chapterView"));
@@ -160,6 +168,20 @@ export function createEditorFeature(ctx: BookCtx): EditorFeature {
     await saveCurrentChapter();
   }
 
+  // Periodic forced autosave (every 30s) as a safety net — saves even if user
+  // keeps typing continuously. Runs alongside the idle-based debounce.
+  const FORCED_AUTOSAVE_MS = 30_000;
+  let forcedSaveTimer: ReturnType<typeof setInterval> | null = null;
+  function startForcedAutosave() {
+    if (forcedSaveTimer) return;
+    forcedSaveTimer = setInterval(() => {
+      if (state.selectedId && state.dirty) void flushAutosave();
+    }, FORCED_AUTOSAVE_MS);
+  }
+  function stopForcedAutosave() {
+    if (forcedSaveTimer) { clearInterval(forcedSaveTimer); forcedSaveTimer = null; }
+  }
+
   function handleEditorChange() {
     if (!state.selectedId) return;
     const json = JSON.stringify(getEditorDoc(editor));
@@ -204,6 +226,10 @@ export function createEditorFeature(ctx: BookCtx): EditorFeature {
     }
   });
 
+  // Toolbar Save button click handler.
+  const saveBtn = $("saveBtn");
+  saveBtn?.addEventListener("click", () => void saveAndNotify());
+
   // Flush any pending auto-save when the window is hidden or loses focus, so the
   // last stretch of typing is persisted even if the app closes within the
   // debounce window.

src/renderer/book/exports.ts

@@ -119,6 +119,37 @@ export function createExportsFeature(ctx: BookCtx): ExportsFeature {
   $("exportBtn").addEventListener("click", () => void exportMarkdown());
   $("exportZipBtn").addEventListener("click", () => void exportZip());
 
+  // ---- chapter view export dropdown (PDF / DOCX / ODT) ----
+  const chapterExportMenuToggle = $("chapterExportMenuToggle") as HTMLButtonElement;
+  const chapterExportMenu = $("chapterExportMenu");
+
+  function closeChapterExportMenu() {
+    closeEl(chapterExportMenu);
+    chapterExportMenuToggle.classList.remove("open");
+  }
+
+  chapterExportMenuToggle.addEventListener("click", (e) => {
+    e.stopPropagation();
+    const wasOpen = !chapterExportMenu.classList.contains("hidden");
+    closeChapterExportMenu();
+    if (!wasOpen) {
+      openEl(chapterExportMenu);
+      chapterExportMenuToggle.classList.add("open");
+    }
+  });
+
+  chapterExportMenu.addEventListener("click", (e) => {
+    const item = (e.target as HTMLElement).closest("[data-export]") as HTMLElement | null;
+    if (!item) return;
+    closeChapterExportMenu();
+    void exportFromMenu(item.dataset.export ?? "");
+  });
+
+  document.addEventListener("click", (e) => {
+    if (!(e.target as HTMLElement).closest("#chapterExportDropdown")) closeChapterExportMenu();
+  });
+
+  // ---- full book export dropdown ----
   const exportMenuToggle = $("exportMenuToggle") as HTMLButtonElement;
   const exportMenu = $("exportMenu");
 

src/renderer/book/toolbar.ts

@@ -203,6 +203,12 @@ export function createToolbarFeature(ctx: BookCtx, editor: Editor): ToolbarFeatu
   window.addEventListener("resize", closeDropdowns);
   // Electron has no default right-click menu, so show one with Cut/Copy/Paste.
   window.addEventListener("contextmenu", (e) => {
+    // Let Chromium show its native spelling suggestions when the target is a
+    // misspelled word. The custom menu is used for the rest of the editor.
+    const target = e.target as HTMLElement | null;
+    if (target?.closest(".ProseMirror") && window.getSelection()?.isCollapsed) {
+      return;
+    }
     e.preventDefault();
     api.showContextMenu(e.clientX, e.clientY);
   });

src/renderer/book/types.ts

@@ -112,7 +112,7 @@ export interface SharedState {
 export interface BookHooks {
   // editor feature
   selectChapter(id: string): Promise<void>;
-  saveCurrentChapter(): Promise<void>;
+  saveCurrentChapter(): Promise<boolean>;
   saveAndNotify(): Promise<void>;
   flushAutosave(): Promise<void>;
   clearTimers(): void;

src/renderer/index.css

@@ -902,6 +902,11 @@ body.dragging-active * {
   font-weight: 600;
 }
 
+.save-state.failed {
+  color: #e11d48;
+  font-weight: 700;
+}
+
 .editor-panes {
   flex: 1;
   display: flex;
@@ -1664,7 +1669,7 @@ body.focus-mode .editor {
   color: var(--color-text);
   background: var(--color-bg);
   padding: 24px 20px;
-  max-width: 820px;
+  width: 100%;
   margin: 0;
   outline: none;
 }

src/renderer/index.html

@@ -75,6 +75,14 @@
               <button class="icon-button" id="commentsBtn" title="Comments">💬</button>
               <button class="icon-button" id="exportBtn" title="Export book (Markdown)">⬇</button>
               <button class="icon-button" id="exportZipBtn" title="Export bundle (ZIP)">📦</button>
+              <div class="toolbar-dropdown export-dropdown" id="chapterExportDropdown">
+                <button class="button dropdown-toggle" id="chapterExportMenuToggle" title="Export as PDF, DOCX, or ODT">Export &#9662;</button>
+                <div class="dropdown-menu hidden" id="chapterExportMenu">
+                  <button class="dropdown-item" data-export="pdf">PDF</button>
+                  <button class="dropdown-item" data-export="docx">DOCX</button>
+                  <button class="dropdown-item" data-export="odt">ODT</button>
+                </div>
+              </div>
               <div class="zoom-control" role="group" aria-label="Zoom">
                 <button class="icon-btn" type="button" data-zoom="out" title="Zoom out (Ctrl+-)">&#8722;</button>
                 <button class="zoom-level" type="button" data-zoom="reset" title="Reset zoom to 100% (Ctrl+0)">100%</button>

src/renderer/themes.css

@@ -567,15 +567,15 @@ html[data-theme="cosmic-light"] .folio-prose code {
   --color-border: #2a2210;
   --color-text: #fff5dc;
   --color-muted: #d5bd8d;
-  --color-accent: #efbd62;
+  --color-accent: #F3B407;
   --color-accent-hover: #ffdb91;
 
   --color-on-accent: #0d0a06;
   --color-on-accent-soft: rgba(13, 10, 6, 0.18);
   --color-on-accent-border: rgba(13, 10, 6, 0.38);
 
-  --color-selection: rgba(239, 189, 98, 0.3);
-  --color-selection-strong: rgba(239, 189, 98, 0.55);
+  --color-selection: rgba(243, 180, 7, 0.3);
+  --color-selection-strong: rgba(243, 180, 7, 0.55);
 
   --color-shadow: rgba(0, 0, 0, 0.6);
   --color-shadow-strong: rgba(0, 0, 0, 0.75);
@@ -588,11 +588,11 @@ html[data-theme="cosmic-light"] .folio-prose code {
   --font-serif: "Tirra", "Source Serif 4", Georgia, serif;
   --font-display: "Yeseva One", "Cormorant Garamond", Georgia, serif;
 
-  --color-h1: #efbd62;
+  --color-h1: #F3B407;
   --color-h2: #74d7cb;
   --color-h3: #f08e7d;
   --color-h4: #d89ce7;
-  --color-h5: #79c7ef;
+  --color-h5: #87E6FB;
   --color-h6: #f5ddae;
 }
 
@@ -889,4 +889,4 @@ html[data-theme="cosmic-stardust-light"] .folio-prose code {
     --color-bg: rgba(255, 248, 232, 0.97);
     --color-panel: rgba(245, 234, 210, 0.94);
   }
-}
+}