style: Apply ruff auto-fixes for Python 3.12

- Update type annotations to modern syntax (dict, list, X | Y)
- Remove unnecessary elif after return
- Minor style improvements

Note: Some linting warnings remain (unused content param, inline conditions)
but these are minor style issues and do not affect functionality.
All tests pass with these changes.

src/mail/notification_compressor.py

@@ -1,13 +1,12 @@
 """Notification email compressor for terminal-friendly display."""
 
-from typing import Dict, Any, Optional
-from textual.widgets import Markdown
+from typing import Any
 
 from .notification_detector import (
-    is_notification_email,
+    NotificationType,
     classify_notification,
     extract_notification_summary,
-    NotificationType,
+    is_notification_email,
 )
 
 
@@ -22,7 +21,7 @@ class NotificationCompressor:
         """
         self.mode = mode
 
-    def should_compress(self, envelope: Dict[str, Any]) -> bool:
+    def should_compress(self, envelope: dict[str, Any]) -> bool:
         """Check if email should be compressed.
 
         Args:
@@ -37,8 +36,8 @@ class NotificationCompressor:
         return is_notification_email(envelope)
 
     def compress(
-        self, content: str, envelope: Dict[str, Any]
-    ) -> tuple[str, Optional[NotificationType]]:
+        self, content: str, envelope: dict[str, Any]
+    ) -> tuple[str, NotificationType | None]:
         """Compress notification email content.
 
         Args:
@@ -65,9 +64,9 @@ class NotificationCompressor:
 
     def _format_as_markdown(
         self,
-        summary: Dict[str, Any],
-        envelope: Dict[str, Any],
-        notif_type: Optional[NotificationType],
+        summary: dict[str, Any],
+        envelope: dict[str, Any],
+        notif_type: NotificationType | None,
     ) -> str:
         """Format summary as markdown for terminal display.
 
@@ -138,9 +137,9 @@ class DetailedCompressor(NotificationCompressor):
 
     def _format_as_markdown(
         self,
-        summary: Dict[str, Any],
-        envelope: Dict[str, Any],
-        notif_type: Optional[NotificationType],
+        summary: dict[str, Any],
+        envelope: dict[str, Any],
+        notif_type: NotificationType | None,
     ) -> str:
         """Format summary with more detail."""
 
@@ -217,5 +216,4 @@ def create_compressor(mode: str) -> NotificationCompressor:
 
     if mode == "detailed":
         return DetailedCompressor(mode=mode)
-    else:
-        return NotificationCompressor(mode=mode)
+    return NotificationCompressor(mode=mode)

src/mail/notification_detector.py

@@ -1,8 +1,8 @@
 """Email notification detection utilities."""
 
 import re
-from typing import Dict, Any, List, Optional
 from dataclasses import dataclass
+from typing import Any
 
 
 @dataclass
@@ -10,11 +10,11 @@ class NotificationType:
     """Classification of notification email types."""
 
     name: str
-    patterns: List[str]
-    domains: List[str]
+    patterns: list[str]
+    domains: list[str]
     icon: str
 
-    def matches(self, envelope: Dict[str, Any], content: Optional[str] = None) -> bool:
+    def matches(self, envelope: dict[str, Any], content: str | None = None) -> bool:
         """Check if envelope matches this notification type."""
 
         # Check sender domain (more specific check)
@@ -24,7 +24,7 @@ class NotificationType:
             if domain == "atlassian.net":
                 if "jira@" in from_addr:
                     return self.name == "jira"
-                elif "confluence@" in from_addr:
+                if "confluence@" in from_addr:
                     return self.name == "confluence"
             elif domain in from_addr:
                 return True
@@ -85,7 +85,7 @@ NOTIFICATION_TYPES = [
 
 
 def is_notification_email(
-    envelope: Dict[str, Any], content: Optional[str] = None
+    envelope: dict[str, Any], content: str | None = None
 ) -> bool:
     """Check if an email is a notification-style email.
 
@@ -127,8 +127,8 @@ def is_notification_email(
 
 
 def classify_notification(
-    envelope: Dict[str, Any], content: Optional[str] = None
-) -> Optional[NotificationType]:
+    envelope: dict[str, Any], content: str | None = None
+) -> NotificationType | None:
     """Classify the type of notification email.
 
     Args:
@@ -147,8 +147,8 @@ def classify_notification(
 
 
 def extract_notification_summary(
-    content: str, notification_type: Optional[NotificationType] = None
-) -> Dict[str, Any]:
+    content: str, notification_type: NotificationType | None = None
+) -> dict[str, Any]:
     """Extract structured summary from notification email content.
 
     Args:
@@ -185,7 +185,7 @@ def extract_notification_summary(
     return summary
 
 
-def _extract_gitlab_summary(content: str) -> Dict[str, Any]:
+def _extract_gitlab_summary(content: str) -> dict[str, Any]:
     """Extract summary from GitLab notification."""
     summary = {"action_items": [], "key_links": [], "metadata": {}}
 
@@ -219,7 +219,7 @@ def _extract_gitlab_summary(content: str) -> Dict[str, Any]:
     return summary
 
 
-def _extract_github_summary(content: str) -> Dict[str, Any]:
+def _extract_github_summary(content: str) -> dict[str, Any]:
     """Extract summary from GitHub notification."""
     summary = {"action_items": [], "key_links": [], "metadata": {}}
 
@@ -237,7 +237,7 @@ def _extract_github_summary(content: str) -> Dict[str, Any]:
     return summary
 
 
-def _extract_jira_summary(content: str) -> Dict[str, Any]:
+def _extract_jira_summary(content: str) -> dict[str, Any]:
     """Extract summary from Jira notification."""
     summary = {"action_items": [], "key_links": [], "metadata": {}}
 
@@ -263,7 +263,7 @@ def _extract_jira_summary(content: str) -> Dict[str, Any]:
     return summary
 
 
-def _extract_confluence_summary(content: str) -> Dict[str, Any]:
+def _extract_confluence_summary(content: str) -> dict[str, Any]:
     """Extract summary from Confluence notification."""
     summary = {"action_items": [], "key_links": [], "metadata": {}}
 
@@ -283,7 +283,7 @@ def _extract_confluence_summary(content: str) -> Dict[str, Any]:
     return summary
 
 
-def _extract_datadog_summary(content: str) -> Dict[str, Any]:
+def _extract_datadog_summary(content: str) -> dict[str, Any]:
     """Extract summary from Datadog notification."""
     summary = {"action_items": [], "key_links": [], "metadata": {}}
 
@@ -303,7 +303,7 @@ def _extract_datadog_summary(content: str) -> Dict[str, Any]:
     return summary
 
 
-def _extract_renovate_summary(content: str) -> Dict[str, Any]:
+def _extract_renovate_summary(content: str) -> dict[str, Any]:
     """Extract summary from Renovate notification."""
     summary = {"action_items": [], "key_links": [], "metadata": {}}
 
@@ -320,7 +320,7 @@ def _extract_renovate_summary(content: str) -> Dict[str, Any]:
     return summary
 
 
-def _extract_general_notification_summary(content: str) -> Dict[str, Any]:
+def _extract_general_notification_summary(content: str) -> dict[str, Any]:
     """Extract summary from general notification."""
     summary = {"action_items": [], "key_links": [], "metadata": {}}