Add tweakcn custom theme import

Adds a browser-local custom tweakcn theme slot while preserving the existing built-in themes.

Includes:
- tweakcn share-link import, validation, persistence, and custom theme rendering
- Custom option in Appearance and Quick Settings
- responsive/config toolbar and chat tool-card polish from follow-up review
- security hardening for bounded fetches, CSS token validation, redirect handling, and fail-closed unreadable payloads

Verification:
- OPENCLAW_LOCAL_CHECK=0 pnpm check:changed
- GitHub CI clean on 6ff13a1b33

test/scripts/test-projects.test.ts

@@ -259,6 +259,22 @@ describe("scripts/test-projects changed-target routing", () => {
     ]);
   });
 
+  it("routes changed ui support files to the ui lane without dead include globs", () => {
+    const plans = buildVitestRunPlans(["--changed", "origin/main"], process.cwd(), () => [
+      "ui/src/styles/base.css",
+      "ui/src/test-helpers/lit-warnings.setup.ts",
+    ]);
+
+    expect(plans).toEqual([
+      {
+        config: "test/vitest/vitest.ui.config.ts",
+        forwardedArgs: [],
+        includePatterns: null,
+        watchMode: false,
+      },
+    ]);
+  });
+
   it("routes auto-reply route source files to route regression tests", () => {
     expect(
       resolveChangedTestTargetPlan([
@@ -274,7 +290,6 @@ describe("scripts/test-projects changed-target routing", () => {
       ],
     });
   });
-
   it("routes changed utils and shared files to their light scoped lanes", () => {
     const plans = buildVitestRunPlans(["--changed", "origin/main"], process.cwd(), () => [
       "src/shared/string-normalization.ts",