Add playlist filter and show video durations in selection dialog

Introduces a filter input to the PlaylistSelectionDialog for searching videos by title and displays video durations next to each entry. Updates English translations to support the new filter placeholder and analysis status message.

src/gui/ytsage_gui_dialogs/ytsage_dialogs_selection.py

@@ -208,6 +208,27 @@ class PlaylistSelectionDialog(QDialog):
         # Main layout
         main_layout = QVBoxLayout(self)
 
+        # Filter Input
+        self.filter_input = QLineEdit()
+        self.filter_input.setPlaceholderText(_("dialogs.filter_playlist_placeholder"))
+        self.filter_input.textChanged.connect(self.filter_list)
+        self.filter_input.setStyleSheet(
+            """
+            QLineEdit {
+                background-color: #363636;
+                border: 2px solid #3d3d3d;
+                border-radius: 4px;
+                padding: 5px;
+                min-height: 30px;
+                color: white;
+            }
+            QLineEdit:focus {
+                border-color: #ff0000;
+            }
+        """
+        )
+        main_layout.addWidget(self.filter_input)
+
         # Top buttons (Select/Deselect All)
         button_layout = QHBoxLayout()
         select_all_btn = QPushButton(_("buttons.select_all"))
@@ -339,6 +360,13 @@ class PlaylistSelectionDialog(QDialog):
                     pass  # Ignore invalid numbers
         return selected_indices
 
+    def filter_list(self, text: str) -> None:
+        """Filter the list of checkboxes based on title."""
+        text = text.lower()
+        for checkbox in self.checkboxes:
+            title = (checkbox.property("full_title") or "").lower()
+            checkbox.setVisible(text in title)
+
     def _populate_list(self, previously_selected_string) -> None:
         """Populates the scroll area with checkboxes for each video."""
         selected_indices = self._parse_selection_string(previously_selected_string)
@@ -356,12 +384,29 @@ class PlaylistSelectionDialog(QDialog):
 
             video_index = index + 1  # yt-dlp uses 1-based indexing
             title = entry.get("title", f"Video {video_index}")
-            # Shorten title if too long
-            display_title = (title[:70] + "...") if len(title) > 73 else title
+            
+            # Format duration
+            duration = entry.get("duration")
+            duration_str = ""
+            if duration:
+                try:
+                    m, s = divmod(int(duration), 60)
+                    h, m = divmod(m, 60)
+                    if h > 0:
+                        duration_str = f" [{h}:{m:02d}:{s:02d}]"
+                    else:
+                        duration_str = f" [{m:02d}:{s:02d}]"
+                except (ValueError, TypeError):
+                    pass
+            
+            # Shorten title if too long but keep enough space for duration
+            max_len = 65
+            display_title = (title[:max_len] + "...") if len(title) > max_len + 3 else title
 
-            checkbox = QCheckBox(f"{video_index}. {display_title}")
+            checkbox = QCheckBox(f"{video_index}. {display_title}{duration_str}")
             checkbox.setChecked(video_index in selected_indices)
             checkbox.setProperty("video_index", video_index)  # Store index
+            checkbox.setProperty("full_title", title) # Store full title for filtering
             checkbox.setStyleSheet(
                 """
                 QCheckBox {