fix(pii): remove lookahead from hostname regex, fix fmt in analysis test

Rust's `regex` crate does not support lookaround assertions. The hostname
pattern `(?=.{1,253}\b)` caused a panic on every `PiiDetector::new()` call,
failing all four PII detector tests in CI (rust-fmt-check, rust-clippy,
rust-tests). Removed the lookahead; the remaining pattern correctly matches
valid FQDNs without the RFC 1035 length pre-check.

Also reformatted analysis.rs:253 to satisfy `rustfmt` (line break after `=`).

All 127 Rust tests pass and `cargo fmt --check` and `cargo clippy -- -D
warnings` are clean.

src-tauri/src/commands/analysis.rs

@@ -250,10 +250,8 @@ mod tests {
 
     #[test]
     fn test_validate_log_file_path_accepts_small_file() {
-        let file_path = std::env::temp_dir().join(format!(
-            "tftsr-analysis-test-{}.log",
-            uuid::Uuid::now_v7()
-        ));
+        let file_path =
+            std::env::temp_dir().join(format!("tftsr-analysis-test-{}.log", uuid::Uuid::now_v7()));
         std::fs::write(&file_path, "hello").unwrap();
         let result = validate_log_file_path(file_path.to_string_lossy().as_ref());
         assert!(result.is_ok());

src-tauri/src/pii/patterns.rs

@@ -75,7 +75,9 @@ pub fn get_patterns() -> Vec<(PiiType, Regex)> {
         // Hostname / FQDN
         (
             PiiType::Hostname,
-            Regex::new(r"\b(?=.{1,253}\b)(?:[A-Za-z0-9](?:[A-Za-z0-9\-]{0,61}[A-Za-z0-9])?\.)+[A-Za-z]{2,63}\b")
+            Regex::new(
+                r"\b(?:[A-Za-z0-9](?:[A-Za-z0-9\-]{0,61}[A-Za-z0-9])?\.)+[A-Za-z]{2,63}\b",
+            )
             .unwrap(),
         ),
     ]