test(e2e): modernize stale routes for 2.0 section URLs (#347)

The e2e specs predate the 2.0 section-route migration and navigated to
single-segment tool URLs (/resize) that now 404 (App.tsx only mounts
/:section/:toolId). This broke the whole e2e suite (Cross-Browser, Device
Matrix, E2E Full, Visual) - part of the known stale-spec backlog.

- Sweep 929 goto("/<tool>") -> goto("/<section>/<tool>") across 45 spec
  files, using the authoritative TOOLS + toolSection() mapping. Two-segment
  routes, top-level routes (/automate, /editor, ...), and intentional 404
  tests (/nonexistent-*) are untouched.
- Implement the legacy redirects the specs already assert: the 1.x color
  tools (brightness-contrast, saturation, color-channels, color-effects)
  redirect to /image/adjust-colors (App.tsx). Good for old bookmarks too.
- Remove the analytics-consent page tests (gui-navigation + gui-visual);
  #336 deleted that page.

Mechanical + biome-clean + web typecheck passes. Browser-specific behavior
can only be confirmed by the nightly e2e jobs.

apps/web/src/App.tsx

@@ -187,6 +187,24 @@ export function App() {
                   <Route path="/files" element={<FilesPage />} />
                   <Route path="/privacy" element={<PrivacyPolicyPage />} />
                   <Route path="/editor" element={<EditorPage />} />
+                  {/* Legacy 1.x color tools were consolidated into adjust-colors;
+                      redirect old bookmarks to the section route. */}
+                  <Route
+                    path="/brightness-contrast"
+                    element={<Navigate to="/image/adjust-colors" replace />}
+                  />
+                  <Route
+                    path="/saturation"
+                    element={<Navigate to="/image/adjust-colors" replace />}
+                  />
+                  <Route
+                    path="/color-channels"
+                    element={<Navigate to="/image/adjust-colors" replace />}
+                  />
+                  <Route
+                    path="/color-effects"
+                    element={<Navigate to="/image/adjust-colors" replace />}
+                  />
                   <Route path="/:section/:toolId" element={<ToolPage />} />
                   <Route path="/" element={<HomePage />} />
                   <Route path="*" element={<NotFoundPage />} />