Complete Phase 1: parallel sync, IPC, theme colors, lazy CLI loading

- Sync: Parallelize message downloads with asyncio.gather (batch size 5)
- Sync: Increase HTTP semaphore from 2 to 5 concurrent requests
- Sync: Add IPC notifications to sync daemon after sync completes
- Mail: Replace all hardcoded RGB colors with theme variables
- Mail: Remove envelope icon/checkbox gap (padding cleanup)
- Mail: Add IPC listener for refresh notifications from sync
- Calendar: Style current time line with error color and solid line
- Tasks: Fix table not displaying (CSS grid to horizontal layout)
- CLI: Implement lazy command loading for faster startup (~12s to ~0.3s)
- Add PROJECT_PLAN.md with full improvement roadmap
- Add src/utils/ipc.py for Unix socket cross-app communication

src/mail/app.py

@@ -10,6 +10,7 @@ from .actions.delete import delete_current
 from src.services.taskwarrior import client as taskwarrior_client
 from src.services.himalaya import client as himalaya_client
 from src.utils.shared_config import get_theme_name
+from src.utils.ipc import IPCListener, IPCMessage
 from textual.containers import Container, ScrollableContainer, Vertical, Horizontal
 from textual.timer import Timer
 from textual.binding import Binding
@@ -149,7 +150,7 @@ class EmailViewerApp(App):
     async def on_mount(self) -> None:
         self.alert_timer: Timer | None = None  # Timer to throttle alerts
         self.theme = get_theme_name()
-        self.title = "MaildirGTD"
+        self.title = "LUK Mail"
         self.query_one("#main_content").border_title = self.status_title
         sort_indicator = "↑" if self.sort_order_ascending else "↓"
         self.query_one("#envelopes_list").border_title = f"1️⃣ Emails {sort_indicator}"
@@ -157,6 +158,10 @@ class EmailViewerApp(App):
 
         self.query_one("#folders_list").border_title = "3️⃣ Folders"
 
+        # Start IPC listener for refresh notifications from sync daemon
+        self._ipc_listener = IPCListener("mail", self._on_ipc_message)
+        self._ipc_listener.start()
+
         self.fetch_accounts()
         self.fetch_folders()
         worker = self.fetch_envelopes()
@@ -164,6 +169,12 @@ class EmailViewerApp(App):
         self.query_one("#envelopes_list").focus()
         self.action_oldest()
 
+    def _on_ipc_message(self, message: IPCMessage) -> None:
+        """Handle IPC messages from sync daemon."""
+        if message.event == "refresh":
+            # Schedule a reload on the main thread
+            self.call_from_thread(self.fetch_envelopes)
+
     def compute_status_title(self):
         metadata = self.message_store.get_metadata(self.current_message_id)
         message_date = metadata["date"] if metadata else "N/A"
@@ -820,6 +831,9 @@ class EmailViewerApp(App):
         self.query_one("#envelopes_list").focus()
 
     def action_quit(self) -> None:
+        # Stop IPC listener before exiting
+        if hasattr(self, "_ipc_listener"):
+            self._ipc_listener.stop()
         self.exit()
 
     def action_toggle_selection(self) -> None: