policyprepworkflow: enhancements and fixes

- Added row copy functionality (Ctrl+C)
- Improved row selection visual contrast
- Fixed data state issues when navigating between stages

Server Log tab
- Added new Server Log tab to the main application
- Implemented live filtering with wildcard support
- Enabled auto-refresh capability

Multiagent selector
- Added file loading support for device lists

TUI/Widgets/multiagentselector.py

@@ -14,6 +14,7 @@
 #    along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 import difflib
+from pathlib import Path
 import re
 from typing import List, Optional
 
@@ -57,7 +58,7 @@ class MultiAgentSelector(Widget):
 
     def compose(self):
         yield Header(show_clock=True, icon="⚙")
-        title_text = Static("🖥️ Agent Selector", id="selector_title")
+        title_text = Static("🖥️ Agent Selector", id="selector_title")
         title_text.styles.margin = (0, 0, 0, 1)
         yield title_text
 
@@ -77,7 +78,7 @@ class MultiAgentSelector(Widget):
                 text_area.styles.overflow_y = "auto"
                 yield text_area
 
-                with Horizontal(id="switch_search_container"):
+                with Horizontal(id="switch_container"):
                     switch = Switch(value=False, id="match_switch")
                     switch.styles.width = "auto"
                     switch.styles.margin = (1, 0, 0, 0)
@@ -89,8 +90,13 @@ class MultiAgentSelector(Widget):
                     switch_label.styles.margin = (2, 1, 0, 0)
                     yield switch_label
 
+                with Horizontal(id="action_buttons_container"):
+                    load_file = Button("📂 Load File", id="load_file_button")
+                    load_file.styles.margin = (1, 1, 0, 1)
+                    yield load_file
+
                     search = Button("🔍 Search", id="search_button")
-                    search.styles.margin = (1, 0, 0, 0)
+                    search.styles.margin = (1, 0, 0, 1)
                     yield search
 
                 with Horizontal() as select_buttons:
@@ -152,6 +158,9 @@ class MultiAgentSelector(Widget):
             ]
             self.post_message(self.AgentsSelected(selected_agents))
             event.stop()
+        elif btn_id == "load_file_button":
+            self._load_from_file()
+            event.stop()
         elif btn_id == "search_button":
             self.update_matches()
             event.stop()
@@ -166,7 +175,7 @@ class MultiAgentSelector(Widget):
             match_list.add_option((name, name))
         unmatched_label = self.query_one("#unmatched_label", Static)
         if unmatched:
-            unmatched_label.update(f"⚠️ No matches for: {', '.join(unmatched)}")
+            unmatched_label.update(f"⚠️ No matches for: {', '.join(unmatched)}")
         else:
             unmatched_label.update("")
 
@@ -214,3 +223,118 @@ class MultiAgentSelector(Widget):
                 else:
                     unmatched.append(name)
         return sorted(matched), unmatched
+
+    def _load_from_file(self):
+        """Safely load device names from a text file."""
+        try:
+            # Import here to avoid issues if tkinter isn't available
+            import tkinter as tk
+            from tkinter import filedialog
+
+            # Create file dialog
+            root = tk.Tk()
+            root.withdraw()
+
+            file_path = filedialog.askopenfilename(
+                title="Select device list file",
+                filetypes=[
+                    ("Text files", "*.txt"),
+                    ("CSV files", "*.csv"),
+                    ("All files", "*.*"),
+                ],
+            )
+
+            if not file_path:
+                # User cancelled
+                return
+
+            # Validate file path
+            path_obj = Path(file_path)
+            if not path_obj.exists():
+                self.app.notify("File does not exist", severity="error", timeout=3)
+                return
+
+            if not path_obj.is_file():
+                self.app.notify(
+                    "Selected path is not a file", severity="error", timeout=3
+                )
+                return
+
+            # Check file size (limit to 1 MB for safety)
+            file_size = path_obj.stat().st_size
+            if file_size > 1_000_000:  # 1 MB
+                self.app.notify(
+                    f"File too large ({file_size:,} bytes). Maximum 1 MB.",
+                    severity="error",
+                    timeout=5,
+                )
+                return
+
+            # Read file with proper encoding to preserve emojis
+            try:
+                with open(file_path, "r", encoding="utf-8") as f:
+                    content = f.read()
+            except UnicodeDecodeError:
+                # Try with different encoding if UTF-8 fails
+                try:
+                    with open(file_path, "r", encoding="latin-1") as f:
+                        content = f.read()
+                    self.app.notify(
+                        "File loaded with Latin-1 encoding (UTF-8 failed)",
+                        severity="warning",
+                        timeout=3,
+                    )
+                except Exception as e:
+                    self.app.notify(
+                        f"Error reading file: {str(e)}", severity="error", timeout=5
+                    )
+                    return
+
+            # Validate and sanitize content
+            lines = content.split("\n")
+            valid_lines = []
+            invalid_count = 0
+
+            # Pattern for valid hostnames/device names
+            # Allows: letters, numbers, hyphens, underscores, periods, and Unicode chars
+            hostname_pattern = re.compile(r"^[\w\-\.\u0080-\uFFFF]+$", re.UNICODE)
+
+            for line in lines:
+                line = line.strip()
+                if not line:
+                    continue  # Skip empty lines
+
+                # Check if line looks like a valid hostname/device name
+                if hostname_pattern.match(line):
+                    valid_lines.append(line)
+                else:
+                    invalid_count += 1
+                    # Log but don't add invalid entries
+
+            if not valid_lines:
+                self.app.notify(
+                    "No valid device names found in file", severity="warning", timeout=3
+                )
+                return
+
+            # Update text area with validated content
+            text_area = self.query_one("#device_input", TextArea)
+            text_area.text = "\n".join(valid_lines)
+
+            # Show notification
+            msg = f"✅ Loaded {len(valid_lines)} devices from file"
+            if invalid_count > 0:
+                msg += f" ({invalid_count} invalid entries skipped)"
+
+            self.app.notify(msg, severity="information", timeout=5)
+
+        except ImportError:
+            self.app.notify(
+                "tkinter not available - cannot open file dialog",
+                severity="error",
+                timeout=3,
+            )
+        except Exception as e:
+            self.app.notify(
+                f"Error loading file: {str(e)}", severity="error", timeout=5
+            )