Fix: resolve compilation warnings and test failures

- Fix project extraction to skip common directories (src, lib, etc.)
- Remove unused imports in window.rs (AppError, PWSTR, HWND)
- Remove unused import in database.rs tests (chrono::Duration)
- All tests now pass (25/25)
- Zero compilation warnings

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

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

src/analysis/entities.rs

@@ -91,10 +91,15 @@ impl EntityExtractor {
         // Pattern 2: Extract from path
         if text.contains('/') || text.contains('\\') {
             let parts: Vec<&str> = text.split(&['/', '\\'][..]).collect();
-            // Find directory name before filename
-            if parts.len() >= 2 {
-                let potential_project = parts[parts.len() - 2];
-                if !potential_project.is_empty() && potential_project.len() > 2 {
+            // Common directory names to skip (not project names)
+            let skip_dirs = ["src", "lib", "bin", "tests", "test", "examples", "target", "build", "dist", "node_modules"];
+
+            // Find directory name before filename, skipping common directories
+            for i in (0..parts.len().saturating_sub(1)).rev() {
+                let potential_project = parts[i];
+                if !potential_project.is_empty()
+                    && potential_project.len() > 2
+                    && !skip_dirs.contains(&potential_project.to_lowercase().as_str()) {
                     return Some(potential_project.to_string());
                 }
             }

src/capture/window.rs

@@ -1,11 +1,13 @@
 /// Window metadata extraction (Windows uniquement)
 use serde::{Deserialize, Serialize};
-use crate::error::{AppError, Result};
+use crate::error::Result;
+
+#[cfg(not(windows))]
+use crate::error::AppError;
 
 #[cfg(windows)]
 use windows::{
-    core::PWSTR,
-    Win32::Foundation::{HWND, MAX_PATH},
+    Win32::Foundation::MAX_PATH,
     Win32::System::ProcessStatus::GetModuleBaseNameW,
     Win32::System::Threading::{OpenProcess, PROCESS_QUERY_INFORMATION, PROCESS_VM_READ},
     Win32::UI::WindowsAndMessaging::{GetForegroundWindow, GetWindowTextW, GetWindowThreadProcessId},

src/storage/database.rs

@@ -284,7 +284,6 @@ impl Database {
 mod tests {
     use super::*;
     use tempfile::NamedTempFile;
-    use chrono::Duration;
 
     #[test]
     fn test_database_creation() {