fix(KB-083): fix SpecEditor layout with proper CSS and remove hardcoded rows

- Add comprehensive CSS styles for SpecEditor component layout
- Remove hardcoded rows prop from SpecEditor for flexible sizing
- Add layout tests for SpecEditor to verify responsive behavior
- Include changeset for patch release of @dustinbyrne/kb package

packages/dashboard/app/components/SpecEditor.tsx

@@ -128,7 +128,6 @@ export function SpecEditor({
             onChange={(e) => setEditContent(e.target.value)}
             disabled={isSaving}
             placeholder="Enter task specification in Markdown..."
-            rows={20}
           />
         ) : content ? (
           <div className="markdown-body">

packages/dashboard/app/components/__tests__/SpecEditor.test.tsx

@@ -452,4 +452,37 @@ Test mission description.
 
     expect(screen.queryByText(/Ctrl/)).toBeNull();
   });
+
+  it("textarea fills available width in edit mode", () => {
+    render(<SpecEditor content={mockContent} onSave={mockOnSave} />);
+
+    fireEvent.click(screen.getByText("Edit"));
+
+    const textarea = screen.getByRole("textbox") as HTMLTextAreaElement;
+    expect(textarea.classList.contains("spec-editor-textarea")).toBe(true);
+    // Verify textarea has the CSS class for proper sizing
+    expect(getComputedStyle(textarea).width).toBeDefined();
+  });
+
+  it("spec-editor-content has correct flex direction", () => {
+    const { container } = render(<SpecEditor content={mockContent} onSave={mockOnSave} />);
+
+    const contentDiv = container.querySelector(".spec-editor-content");
+    expect(contentDiv).toBeTruthy();
+  });
+
+  it("toolbar remains visible when content is long", () => {
+    const longContent = "# Title\n\n" + "Content line\n".repeat(100);
+    render(<SpecEditor content={longContent} onSave={mockOnSave} />);
+
+    fireEvent.click(screen.getByText("Edit"));
+
+    // Toolbar should still be visible
+    const toolbar = document.querySelector(".spec-editor-toolbar");
+    expect(toolbar).toBeTruthy();
+
+    // View and Edit buttons should still be present
+    expect(screen.getByText("View")).toBeTruthy();
+    expect(screen.getByText("Edit")).toBeTruthy();
+  });
 });

packages/dashboard/app/styles.css

@@ -5802,6 +5802,200 @@ html .column.drag-over * {
   }
 }
 
+/* === Spec Editor === */
+.spec-editor {
+  display: flex;
+  flex-direction: column;
+  height: 100%;
+  min-height: 0;
+  overflow: hidden;
+}
+
+/* Toolbar - fixed at top */
+.spec-editor-toolbar {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  padding: 8px 0;
+  border-bottom: 1px solid var(--border);
+  flex-shrink: 0;
+}
+
+.spec-editor-mode-toggle {
+  display: flex;
+  align-items: center;
+  gap: 4px;
+}
+
+.spec-editor-actions {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+}
+
+/* Content area - flexible and scrollable */
+.spec-editor-content {
+  flex: 1;
+  min-height: 0;
+  overflow-y: auto;
+  overflow-x: hidden;
+  padding: 12px 0;
+}
+
+/* Textarea - fills available space in edit mode */
+.spec-editor-textarea {
+  width: 100%;
+  min-height: 200px;
+  height: 100%;
+  flex: 1;
+  padding: 12px;
+  background: var(--bg);
+  border: 1px solid var(--border);
+  border-radius: var(--radius);
+  color: var(--text);
+  font-family: "SF Mono", Monaco, Consolas, monospace;
+  font-size: 13px;
+  line-height: 1.6;
+  resize: none;
+  outline: none;
+  transition: border-color 0.15s, box-shadow 0.15s;
+}
+
+.spec-editor-textarea:focus {
+  border-color: var(--todo);
+  box-shadow: 0 0 0 2px rgba(88, 166, 255, 0.15);
+}
+
+.spec-editor-textarea:disabled {
+  opacity: 0.6;
+  cursor: not-allowed;
+}
+
+/* Empty state */
+.spec-editor-empty {
+  padding: 24px;
+  text-align: center;
+  color: var(--text-muted);
+  font-size: 13px;
+  font-style: italic;
+}
+
+/* Keyboard hint - stays above revision section */
+.spec-editor-hint {
+  display: flex;
+  align-items: center;
+  gap: 4px;
+  padding: 8px 0;
+  font-size: 12px;
+  color: var(--text-muted);
+  border-top: 1px solid var(--border);
+  flex-shrink: 0;
+}
+
+.spec-editor-hint kbd {
+  display: inline-block;
+  padding: 2px 6px;
+  background: var(--card);
+  border: 1px solid var(--border);
+  border-radius: 4px;
+  font-size: 11px;
+  font-family: "SF Mono", Monaco, Consolas, monospace;
+}
+
+/* AI Revision section - fixed at bottom */
+.spec-editor-revision {
+  padding: 16px 0;
+  border-top: 1px solid var(--border);
+  flex-shrink: 0;
+}
+
+.spec-editor-revision h4 {
+  font-size: 13px;
+  font-weight: 600;
+  margin: 0 0 4px 0;
+  color: var(--text);
+}
+
+.spec-editor-revision-help {
+  font-size: 12px;
+  color: var(--text-muted);
+  margin: 0 0 8px 0;
+}
+
+.spec-editor-feedback {
+  width: 100%;
+  padding: 10px 12px;
+  background: var(--bg);
+  border: 1px solid var(--border);
+  border-radius: var(--radius);
+  color: var(--text);
+  font-family: inherit;
+  font-size: 13px;
+  line-height: 1.5;
+  resize: vertical;
+  outline: none;
+  transition: border-color 0.15s, box-shadow 0.15s;
+}
+
+.spec-editor-feedback:focus {
+  border-color: var(--todo);
+  box-shadow: 0 0 0 2px rgba(88, 166, 255, 0.15);
+}
+
+.spec-editor-feedback:disabled {
+  opacity: 0.6;
+  cursor: not-allowed;
+}
+
+.spec-editor-revision-actions {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  margin-top: 8px;
+}
+
+.spec-editor-char-count {
+  font-size: 11px;
+  color: var(--text-muted);
+  font-family: "SF Mono", Monaco, Consolas, monospace;
+}
+
+/* Mobile responsive */
+@media (max-width: 768px) {
+  .spec-editor-content {
+    padding: 8px 0;
+  }
+
+  .spec-editor-textarea {
+    min-height: 150px;
+    padding: 10px;
+    font-size: 14px;
+  }
+
+  .spec-editor-toolbar {
+    padding: 6px 0;
+    flex-wrap: wrap;
+    gap: 8px;
+  }
+
+  .spec-editor-hint {
+    padding: 6px 0;
+    font-size: 11px;
+  }
+
+  .spec-editor-revision {
+    padding: 12px 0;
+  }
+
+  .spec-editor-revision h4 {
+    font-size: 12px;
+  }
+
+  .spec-editor-revision-help {
+    font-size: 11px;
+  }
+}
+
 /* === Quick Entry Box === */
 .quick-entry-box {
   padding: 8px 10px;