fix(release): harden updater status and cutter layout

Ignore malformed update notifications that do not carry a version, preventing unusable release prompts in installed builds.

Keep the loaded cutter workspace free of the source selector and give cutter export selects an explicit non-repeating indicator after workspace styling.

Add regression coverage, bump the patch release to 1.0.10, and update public installation documentation.

src/cutter-workspace-styles.production-path.test.ts

@@ -0,0 +1,19 @@
+import { readFileSync } from 'node:fs';
+import { join } from 'node:path';
+import { describe, expect, test } from 'vitest';
+
+const styles = readFileSync(join(__dirname, 'styles.css'), 'utf8');
+const workspaceStyles = readFileSync(join(__dirname, 'workspace.css'), 'utf8');
+
+describe('cutter workspace style production paths', () => {
+    test('hides the source bar when the non-adjacent workspace is shown', () => {
+        expect(styles).toContain('.cutter-source-bar:has(~ .cutter-workspace.shown)');
+    });
+
+    test('keeps the export profile indicator from tiling after workspace background styling', () => {
+        const selector = '#cutterTab .cutter-export-options select {';
+        const start = workspaceStyles.indexOf(selector);
+        const end = workspaceStyles.indexOf('}', start);
+        expect(workspaceStyles.slice(start, end)).toMatch(/background-repeat:\s*no-repeat/);
+    });
+});