refactor: Improve code structure and test coverage

- Reorganized project structure
- Added comprehensive test suite
- Fixed GUI tests with proper ttk widget handling
- Updated requirements.txt with missing dependencies
- Improved error handling and code organization
- Removed duplicate test files
- Added proper test fixtures and configurations

assets/difficulties.json

@@ -1,8 +1,8 @@
 {
     "easy": {
         "words": 15,
-        "time_limit": null,
-        "description": "Practice mode with no time limit"
+        "time_limit": 120,
+        "description": "Practice mode with 2-minute time limit"
     },
     "medium": {
         "words": 25,
@@ -11,7 +11,7 @@
     },
     "hard": {
         "words": 40,
-        "time_limit": 60,
-        "description": "Challenge mode with more words"
+        "time_limit": 45,
+        "description": "Challenge mode with 45-second time limit"
     }
 }

assets/wordlist.txt

@@ -0,0 +1,100 @@
+the
+be
+to
+of
+and
+a
+in
+that
+have
+I
+it
+for
+not
+on
+with
+he
+as
+you
+do
+at
+this
+but
+his
+by
+from
+they
+we
+say
+her
+she
+or
+an
+will
+my
+one
+all
+would
+there
+their
+what
+so
+up
+out
+if
+about
+who
+get
+which
+go
+me
+when
+make
+can
+like
+time
+no
+just
+him
+know
+take
+people
+into
+year
+your
+good
+some
+could
+them
+see
+other
+than
+then
+now
+look
+only
+come
+its
+over
+think
+also
+back
+after
+use
+two
+how
+our
+work
+first
+well
+way
+even
+new
+want
+because
+any
+these
+give
+day
+most
+us