List view metadata columns and drag-to-resize everywhere

- New optional list-view columns: Description, Size (now includes
  directories), Modified, Owner, Created (via statx birth time), Content
  (item/line count or image dimensions), Access (rwx)
- Drag-to-resize: list view column headers, sidebar sections (Bookmarks/
  Devices/Filetree), Preview/Tags split, and the sidebar/preview side
  panels themselves — all commit to Config on release, not per drag frame
- Column resizing mutates existing row cells live instead of rebuilding,
  with metadata cached per (file, mtime) — fixes lag in large folders
- Fix list view background click (rows were full ListTile width with no
  empty space to click); bookmark selected-background now covers the
  triple-dot menu too; batch rename/new-file dialogs pre-select their
  default text instead of just pre-filling it
- Toolbar scrolls instead of clipping when buttons don't fit; toolbar and
  breadcrumbs are independently toggleable
- Add a "Server" bookmark icon

Co-Authored-By: Claude Sonnet 5 <[email protected]>

Sidebar.py

@@ -9,15 +9,15 @@ from typing import Callable, Optional
 
 import flet as ft
 
-from Bookmarks import IconChoices, LoadBookmarks, SaveBookmarks
+from Bookmarks import IconChoices, IconLabelOverrides, LoadBookmarks, SaveBookmarks
 from Core import (
     AppConfig,
-    ApplyHeightBounds,
     ChipButtonStyle,
     DragGroup,
     MoveIntoDirectory,
     NotificationStyle,
     Palette,
+    ResizeHandle,
 )
 from Devices import DevicesPanel
 from Filetree import Filetree
@@ -40,6 +40,11 @@ class Sidebar(ft.Container):
 
         Sections: list[ft.Control] = []
         SplitEvenly = Config.SplitBookmarksFiletreeEvenly and Config.ShowBookmarks and Config.ShowFiletree
+        # Section boxes a resize-drag can mutate .height on directly — only
+        # built (and only get a drag handle between them) outside SplitEvenly,
+        # which is a 50/50 flex split with no single fixed height to drag.
+        BookmarksBox: Optional[ft.Container] = None
+        DevicesBox: Optional[ft.Container] = None
 
         if Config.ShowBookmarks:
             self.BookmarksListView = ft.ReorderableListView(
@@ -52,21 +57,28 @@ class Sidebar(ft.Container):
                 self.BookmarksListView.expand = 1
                 Sections.append(self.BookmarksListView)
             else:
-                Sections.append(
-                    ApplyHeightBounds(self.BookmarksListView, Config.BookmarksMinHeight, Config.BookmarksMaxHeight)
+                BookmarksBox = ft.Container(
+                    content=self.BookmarksListView,
+                    height=Config.BookmarksMaxHeight or Config.BookmarksMinHeight or None,
                 )
+                Sections.append(BookmarksBox)
 
         if Config.ShowBookmarks and (Config.ShowDevices or Config.ShowFiletree):
-            Sections.append(ft.Divider(height=1, color=Palette.Surface1))
+            if BookmarksBox is not None:
+                Sections.append(self._BuildSectionDivider(BookmarksBox, "BookmarksMaxHeight"))
+            else:
+                Sections.append(ft.Divider(height=1, color=Palette.Surface1))
 
         if Config.ShowDevices:
             self.DevicesView = DevicesPanel(OnNavigate=OnNavigate, Config=Config)
-            Sections.append(
-                ApplyHeightBounds(self.DevicesView, Config.DevicesMinHeight, Config.DevicesMaxHeight)
+            DevicesBox = ft.Container(
+                content=self.DevicesView,
+                height=Config.DevicesMaxHeight or Config.DevicesMinHeight or None,
             )
+            Sections.append(DevicesBox)
 
         if Config.ShowDevices and Config.ShowFiletree:
-            Sections.append(ft.Divider(height=1, color=Palette.Surface1))
+            Sections.append(self._BuildSectionDivider(DevicesBox, "DevicesMaxHeight"))
 
         if Config.ShowFiletree:
             self.FiletreeView = Filetree(
@@ -77,11 +89,9 @@ class Sidebar(ft.Container):
             )
             if SplitEvenly:
                 self.FiletreeView.expand = 1
-                Sections.append(self.FiletreeView)
             else:
-                Sections.append(
-                    ApplyHeightBounds(self.FiletreeView, Config.FiletreeMinHeight, Config.FiletreeMaxHeight)
-                )
+                self.FiletreeView.height = Config.FiletreeMaxHeight or Config.FiletreeMinHeight or None
+            Sections.append(self.FiletreeView)
 
         BorderSide = ft.BorderSide(1, Palette.Surface1)
         Border = ft.Border(left=BorderSide) if Config.SidebarSide == "right" else ft.Border(right=BorderSide)
@@ -94,6 +104,25 @@ class Sidebar(ft.Container):
             border=Border,
         )
 
+    DefaultSectionHeight = 150  # starting point for a drag when a section had no explicit height yet
+
+    def _BuildSectionDivider(self, Box: ft.Container, MaxHeightAttr: str) -> ft.Control:
+        """A resize handle for the section above it (Box) — drags resize that
+        section, whatever's below just reflows into the space that leaves,
+        same "resize what's above the divider" convention as the file list's
+        column dividers resize the column to their left."""
+
+        def OnDrag(Delta: float) -> None:
+            Current = Box.height or self.DefaultSectionHeight
+            Box.height = max(40, Current + Delta)
+            Box.update()
+
+        def OnDragEnd() -> None:
+            setattr(self.Config, MaxHeightAttr, int(Box.height))
+            self.Config.Save()
+
+        return ResizeHandle("vertical", self.Config.SidebarWidth, OnDrag, OnDragEnd)
+
     def _BuildBookmarkTiles(self) -> list[ft.Control]:
         self.LocationTiles = {}
         return [self._BuildBookmarkTile(B) for B in LoadBookmarks()]
@@ -117,6 +146,10 @@ class Sidebar(ft.Container):
         # Not a ListTile: the drag-to-reorder handle needs to wrap everything
         # except the triple-dot menu, which ListTile's fixed leading/title/
         # trailing layout doesn't let us carve out — so this is a plain Row.
+        # The selected background lives on OuterContainer (wrapping the whole
+        # Row, triple-dot included) rather than just RowContent — it used to
+        # stop short of the triple-dot, leaving its area unstyled ("I think
+        # the background of the button should continue to the menu").
         NameLabel = ft.Text(Bookmark.Name, size=14, color=Palette.Text)
         RowContent = ft.Container(
             content=ft.Row(
@@ -127,34 +160,35 @@ class Sidebar(ft.Container):
                 spacing=12,
             ),
             padding=ft.Padding.symmetric(horizontal=16, vertical=10),
-            border_radius=4,
             ink=True,
             on_click=lambda e, p=Bookmark.Path: self.OnNavigate(p),
+            expand=True,
+        )
+
+        MenuButton = ft.PopupMenuButton(
+            icon=ft.Icons.MORE_VERT,
+            items=[
+                ft.PopupMenuItem(content="Edit", on_click=lambda e, b=Bookmark: self._ShowEditBookmarkDialog(b)),
+            ],
+        )
+
+        OuterContainer = ft.Container(
+            content=ft.Row(
+                [ft.Container(ft.ReorderableDragHandle(content=RowContent), expand=True), MenuButton],
+                spacing=0,
+            ),
+            border_radius=4,
         )
 
         def SetSelected(IsSelected: bool) -> None:
-            RowContent.bgcolor = Palette.Surface1 if IsSelected else None
+            OuterContainer.bgcolor = Palette.Surface1 if IsSelected else None
             NameLabel.color = Palette.Mauve if IsSelected else Palette.Text
 
         self.LocationTiles[Bookmark.Path] = SetSelected
 
-        Row = ft.Row(
-            [
-                ft.Container(ft.ReorderableDragHandle(content=RowContent), expand=True),
-                ft.PopupMenuButton(
-                    icon=ft.Icons.MORE_VERT,
-                    items=[
-                        ft.PopupMenuItem(
-                            content="Edit", on_click=lambda e, b=Bookmark: self._ShowEditBookmarkDialog(b)
-                        ),
-                    ],
-                ),
-            ],
-            spacing=0,
-        )
         return ft.DragTarget(
             group=DragGroup,
-            content=Row,
+            content=OuterContainer,
             on_accept=lambda e, dest=Bookmark.Path: self._OnEntryDropped(e, dest),
         )
 
@@ -178,7 +212,10 @@ class Sidebar(ft.Container):
         IconDropdown = ft.Dropdown(
             value=Bookmark.Icon,
             label="Icon",
-            options=[ft.DropdownOption(key=Name, text=Name.split("_")[0].title()) for Name in IconChoices],
+            options=[
+                ft.DropdownOption(key=Name, text=IconLabelOverrides.get(Name, Name.split("_")[0].title()))
+                for Name in IconChoices
+            ],
         )
 
         def DoSave(e=None) -> None: