Add theme engine, animated UI, and Bus Dump / Crypto / Exfil modules

UI:
- Theme engine (5 palettes) persisted to NVS; live Theme switcher module
- Animated shell: boot splash, CRT scanlines, breathing menu cursor,
  wipe-in transitions, spinners, progress bars

New recon modules:
- Bus Dump: SPI-NOR + I2C EEPROM readout to microSD (read-only)
- Crypto Lab: entropy, magic-byte file-ID, XOR brute, AES-128 known-key
- Exfil: SD browser + base64 dump export over USB serial, manifest writer

README updated with the new module table and look-and-feel notes.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AAhMHMRAQLQ9hSbBECKNfn

src/modules/themepick.cpp

@@ -0,0 +1,43 @@
+#include "../core/module.h"
+#include "../core/ui.h"
+#include "../core/theme.h"
+#include <M5Cardputer.h>
+
+// Live theme switcher. Preview swatches, [space]/arrows to cycle, choice
+// saved to NVS so it sticks across reboots.
+class ThemePicker : public Module {
+public:
+  const char* name() const override { return "Theme"; }
+  const char* blurb() const override { return "restyle the UI"; }
+
+  bool onKey(char c) override {
+    if (c == '.' || c == ' ') { theme::set(theme::current() + 1); repaint(); return true; }
+    if (c == ';')             { theme::set(theme::current() - 1); repaint(); return true; }
+    return false;
+  }
+  void onEnter() override { repaint(); }
+
+  void draw() override {
+    auto& d = M5.Display;
+    ui::lineC(0, ui::accent(), "theme: %s  (%d/%d)",
+              theme::active().name, theme::current() + 1, theme::COUNT);
+    // swatch row
+    int y = ui::BODY_Y + 20;
+    for (int i = 0; i < theme::COUNT; i++) {
+      const Theme& t = theme::LIST[i];
+      int x = 6 + i * 30;
+      d.fillRoundRect(x, y, 24, 24, 4, ui::rgb(t.bg));
+      d.fillRect(x + 4, y + 4, 16, 5, ui::rgb(t.accent));
+      d.fillRect(x + 4, y + 11, 10, 4, ui::rgb(t.warn));
+      d.fillRect(x + 4, y + 16, 14, 4, ui::rgb(t.bad));
+      d.drawRoundRect(x, y, 24, 24, 4, i == theme::current() ? ui::glow() : ui::dim());
+    }
+    ui::line(5, "everything restyles instantly.");
+    ui::hintBar("; / .  cycle   [`]back");
+  }
+private:
+  void repaint() { M5.Display.fillScreen(ui::bg());
+                   ui::titleBar(name(), blurb()); draw(); }
+};
+
+Module* makeThemePicker() { return new ThemePicker(); }