fix: invalidate version cache when current version changes

Version check cache was only validated by time, causing stale update
notifications when the application version changed. Now the cache is
also invalidated when the current version doesn't match the cached
current_version, ensuring accurate update checks.

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

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

Author: unhappychoice

src/version/cache.rs

@@ -70,6 +70,12 @@ impl VersionCache {
     pub fn is_cache_valid(entry: &VersionCacheEntry, frequency_hours: u64) -> bool {
         let now = Utc::now();
         let hours_since_check = (now - entry.last_checked).num_hours();
-        hours_since_check < frequency_hours as i64
+        let time_valid = hours_since_check < frequency_hours as i64;
+
+        // Also check if the current version matches
+        let current_version = env!("CARGO_PKG_VERSION");
+        let version_valid = entry.current_version == current_version;
+
+        time_valid && version_valid
     }
 }

tests/unit/version/checker_test.rs

@@ -22,6 +22,13 @@ fn test_is_version_newer() {
     assert!(!VersionChecker::is_version_newer("1.2.2", "1.2.3"));
     assert!(!VersionChecker::is_version_newer("1.2", "1.2.0"));
     assert!(VersionChecker::is_version_newer("1.2.0", "1.2"));
+
+    // Test the specific case causing issues
+    println!(
+        "Testing 0.6.2 vs 0.6.2: {}",
+        VersionChecker::is_version_newer("0.6.2", "0.6.2")
+    );
+    assert!(!VersionChecker::is_version_newer("0.6.2", "0.6.2"));
 }
 
 #[test]