fix: title H1 layout — no emoji gap, add-icon above title, larger font

- Remove reserved left space when note has no emoji icon (conditional render)
- Move "Add icon" button above the title row (Notion-style hover reveal)
- Increase title font size to 32px and top padding to 32px for proper H1 weight
- Update smoke test to validate no-emoji layout and new hover target

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/components/EditorContent.tsx

@@ -203,13 +203,23 @@ export function EditorContent({
       {showEditor && activeTab && (
         <div className="editor-scroll-area">
           <div className="title-section">
-            <div className="title-section__row">
+            {!emojiIcon && (
               <NoteIcon
-                icon={emojiIcon}
+                icon={null}
                 editable={!isTrashed}
                 onSetIcon={handleSetIcon}
                 onRemoveIcon={handleRemoveIcon}
               />
+            )}
+            <div className="title-section__row">
+              {emojiIcon && (
+                <NoteIcon
+                  icon={emojiIcon}
+                  editable={!isTrashed}
+                  onSetIcon={handleSetIcon}
+                  onRemoveIcon={handleRemoveIcon}
+                />
+              )}
               <TitleField
                 title={activeTab.entry.title}
                 filename={activeTab.entry.filename}