refactor: eliminate long namespace usage outside use statements

Replace direct long namespace references (crate::some::long::path::Type)
with proper imports and short type names for better code readability:

- Add missing imports to files throughout the codebase
- Replace long namespace paths with short type names
- Maintain consistent import style across the project
- Fix related module declarations and exports

Examples of changes:
- `crate::domain::error::GitTypeError::` → `GitTypeError::` (with proper import)
- `crate::presentation::game::models::ScreenType::` → `ScreenType::`
- `crate::domain::services::scoring::Rank::` → `Rank::`

All functionality preserved, no implementation changes.
All 589 tests passing.

🤖 Generated with [Claude Code](https://claude.ai/code)

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

Author: unhappychoice

src/domain/models/challenge.rs

@@ -1,5 +1,6 @@
 use super::git_repository::GitRepository;
 use crate::presentation::game::DifficultyLevel;
+use std::path::Path;
 
 #[derive(Debug, Clone, PartialEq, serde::Serialize, serde::Deserialize)]
 pub struct Challenge {
@@ -91,8 +92,6 @@ impl Challenge {
     }
 
     fn get_relative_path(&self, path: &str) -> String {
-        use std::path::Path;
-
         // Try to extract just the filename if it's a full path
         if let Some(file_name) = Path::new(path).file_name() {
             if let Some(parent) = Path::new(path).parent() {

src/domain/models/extraction_options.rs

@@ -1,3 +1,5 @@
+use crate::domain::services::extractor::LanguageRegistry;
+
 #[derive(Debug, Clone)]
 pub struct ExtractionOptions {
     pub include_patterns: Vec<String>,
@@ -10,7 +12,7 @@ pub struct ExtractionOptions {
 impl Default for ExtractionOptions {
     fn default() -> Self {
         Self {
-            include_patterns: crate::domain::services::extractor::LanguageRegistry::all_file_patterns(),
+            include_patterns: LanguageRegistry::all_file_patterns(),
             exclude_patterns: vec![
                 // === Common build directories ===
                 "**/build/**".to_string(),
@@ -101,7 +103,7 @@ impl Default for ExtractionOptions {
 impl ExtractionOptions {
     pub fn apply_language_filter(&mut self) {
         if let Some(ref languages) = self.languages {
-            let registry = crate::domain::services::extractor::LanguageRegistry::all_languages();
+            let registry = LanguageRegistry::all_languages();
             self.include_patterns = registry
                 .into_iter()
                 .filter(|lang| {

src/domain/models/languages/c.rs

@@ -1,4 +1,5 @@
 use crate::domain::models::Language;
+use crate::presentation::ui::Colors;
 use std::hash::Hash;
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
@@ -13,7 +14,6 @@ impl Language for C {
     }
 
     fn color(&self) -> ratatui::style::Color {
-        use crate::presentation::ui::Colors;
         Colors::lang_c()
     }
 

src/domain/models/languages/cpp.rs

@@ -1,4 +1,5 @@
 use crate::domain::models::Language;
+use crate::presentation::ui::Colors;
 use std::hash::Hash;
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
@@ -16,7 +17,6 @@ impl Language for Cpp {
     }
 
     fn color(&self) -> ratatui::style::Color {
-        use crate::presentation::ui::Colors;
         Colors::lang_cpp()
     }
 

src/domain/models/languages/csharp.rs

@@ -1,4 +1,5 @@
 use crate::domain::models::Language;
+use crate::presentation::ui::Colors;
 use std::hash::Hash;
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
@@ -16,7 +17,6 @@ impl Language for CSharp {
     }
 
     fn color(&self) -> ratatui::style::Color {
-        use crate::presentation::ui::Colors;
         Colors::lang_csharp()
     }
 

src/domain/models/languages/dart.rs

@@ -1,4 +1,5 @@
 use crate::domain::models::Language;
+use crate::presentation::ui::Colors;
 use std::hash::Hash;
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
@@ -13,7 +14,6 @@ impl Language for Dart {
     }
 
     fn color(&self) -> ratatui::style::Color {
-        use crate::presentation::ui::Colors;
         Colors::lang_dart()
     }
 

src/domain/models/languages/go.rs

@@ -1,4 +1,5 @@
 use crate::domain::models::Language;
+use crate::presentation::ui::Colors;
 use std::hash::Hash;
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
@@ -13,7 +14,6 @@ impl Language for Go {
     }
 
     fn color(&self) -> ratatui::style::Color {
-        use crate::presentation::ui::Colors;
         Colors::lang_go()
     }
 

src/domain/models/languages/haskell.rs

@@ -1,4 +1,5 @@
 use crate::domain::models::Language;
+use crate::presentation::ui::Colors;
 use std::hash::Hash;
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
@@ -16,7 +17,6 @@ impl Language for Haskell {
     }
 
     fn color(&self) -> ratatui::style::Color {
-        use crate::presentation::ui::Colors;
         Colors::lang_haskell()
     }
 

src/domain/models/languages/java.rs

@@ -1,4 +1,5 @@
 use crate::domain::models::Language;
+use crate::presentation::ui::Colors;
 use std::hash::Hash;
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
@@ -13,7 +14,6 @@ impl Language for Java {
     }
 
     fn color(&self) -> ratatui::style::Color {
-        use crate::presentation::ui::Colors;
         Colors::lang_java()
     }
 

src/domain/models/languages/javascript.rs

@@ -1,4 +1,5 @@
 use crate::domain::models::Language;
+use crate::presentation::ui::Colors;
 use std::hash::Hash;
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
@@ -16,7 +17,6 @@ impl Language for JavaScript {
     }
 
     fn color(&self) -> ratatui::style::Color {
-        use crate::presentation::ui::Colors;
         Colors::lang_javascript()
     }