feat(rawcli): colorized breadcrumb prompt

Color-code the prompt so the session state reads at a glance, using the
trace formatter's palette so prompt and trace look like one UI:

  [ raw / hf / NTAG213 / 0x ]
   dim  ^bold ^cyan  ^bold-green  ^yellow(hex) | magenta(binary)  dim

- bold `raw`; cyan RF field; bold-green identified transponder; entry
  mode yellow for hex, magenta for binary (so the base is obvious and
  flips color on Ctrl-/); dim brackets/separators.
- session.colored_breadcrumb() returns the ANSI form; breadcrumb() stays
  plain (stripping the ANSI yields it — asserted). Prompt message renders
  it via ANSI().

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

tests/test_rawcli.py

@@ -46,6 +46,18 @@ class TestBreadcrumb:
         s.field = "lf"
         assert s.breadcrumb() == "[raw / lf / 0x]"
 
+    def test_colored_matches_plain(self):
+        s = RawSession()
+        s.field, s.transponder = "hf", "NTAG213"
+        assert "\x1b[" in s.colored_breadcrumb()               # actually colored
+        assert _plain(s.colored_breadcrumb()) == s.breadcrumb()  # same content, ANSI stripped
+
+    def test_colored_mode_color_changes(self):
+        s = RawSession()
+        hex_prompt = s.colored_breadcrumb()
+        s.toggle_entry_mode()
+        assert hex_prompt != s.colored_breadcrumb()            # hex vs binary colored differently
+
 
 class TestTraceView:
     def test_command_and_response_lines(self):