feat: add marketing video mode and Remotion marketing video project

Add debug-only Marketing Video Mode toggle that enables hands-free
screen recording across the app: auto-scrolling Featured Trips carousel,
auto-filling trip wizard, smooth trip detail scrolling via CADisplayLink,
and trip options auto-sort with scroll.

Add Remotion marketing video project with 6 scene compositions using
image sequences extracted from screen recordings, varied phone entrance
animations, and deduped frames for smooth playback.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

marketing-videos/src/theme.ts

@@ -0,0 +1,40 @@
+export const THEME = {
+  colors: {
+    hero: "#2D6A4F",
+    search: "#F97316",
+    searchDark: "#1a1a2e",
+    customize: "#EAB308",
+    group: "#3B82F6",
+    itinerary: "#FFF8E7",
+    cta: "#DC2626",
+    white: "#FFFFFF",
+    black: "#000000",
+    textDark: "#1a1a2e",
+  },
+  spring: {
+    damping: 12,
+    mass: 0.5,
+    stiffness: 120,
+  },
+  textShadow: "0 4px 20px rgba(0, 0, 0, 0.4)",
+  textShadowLight: "0 2px 10px rgba(0, 0, 0, 0.15)",
+  font: {
+    heading: "Inter, -apple-system, BlinkMacSystemFont, sans-serif",
+    body: "Inter, -apple-system, BlinkMacSystemFont, sans-serif",
+  },
+} as const;
+
+export const SCENES = {
+  hero: { durationInFrames: 80 },
+  search: { durationInFrames: 80 },
+  customize: { durationInFrames: 80 },
+  group: { durationInFrames: 80 },
+  itinerary: { durationInFrames: 80 },
+  cta: { durationInFrames: 95 },
+} as const;
+
+export const TRANSITION_DURATION = 9;
+export const FPS = 30;
+export const WIDTH = 1080;
+export const HEIGHT = 1920;
+export const TOTAL_DURATION = 450;