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]>

Main.py

@@ -11,7 +11,7 @@ from typing import Optional
 import flet as ft
 
 from Browser import Browser
-from Core import AppName, ApplyAppearance, BuildTheme, BundledFontFamily, EffectiveSettings, LoadConfig
+from Core import AppName, ApplyAppearance, BuildTheme, BundledFontFamily, EffectiveSettings, LoadConfig, ResizeHandle
 from Sidebar import Sidebar
 
 
@@ -75,8 +75,14 @@ def _BuildWindow(Config, StartPath: Path, **BrowserHooks) -> tuple[ft.Row, Brows
     """The normal SaraFem window (sidebar + browser). The file picker is this
     same window with a PickerBar under it, so the two always look alike;
     BrowserHooks are the picker's Browser hooks (see Picker.py)."""
-    OuterRow = ft.Row(expand=True, spacing=0)
+    # STRETCH so the sidebar-width divider (a bare GestureDetector, no
+    # layout control of its own) gets a real height to be draggable across —
+    # confirmed here, not assumed; Flet doesn't stretch Row children by
+    # default. Sidebar/BrowserView already fill full height regardless
+    # (their own content drives that), so this doesn't change how they look.
+    OuterRow = ft.Row(expand=True, spacing=0, vertical_alignment=ft.CrossAxisAlignment.STRETCH)
     SidebarView: Optional[Sidebar] = None
+    SidebarDivider: Optional[ft.Control] = None
 
     def OnPathChanged(NewPath: Path) -> None:
         if SidebarView is not None:
@@ -86,19 +92,41 @@ def _BuildWindow(Config, StartPath: Path, **BrowserHooks) -> tuple[ft.Row, Brows
         if SidebarView is not None:
             SidebarView.RefreshBookmarks()
 
+    def _BuildSidebarWidthDivider() -> ft.Control:
+        """Resizes the sidebar, never BrowserView on its other side — same
+        "only touch your own side" convention as the preview panel's
+        divider in Browser.py, and the two are independent."""
+
+        def OnDrag(Delta: float) -> None:
+            # SidebarSide "right" puts the divider on the sidebar's *left*,
+            # so dragging right (growing the file list) has to shrink the
+            # sidebar — sign flips relative to the "left" case.
+            Signed = -Delta if Config.SidebarSide == "right" else Delta
+            NewWidth = max(120, (SidebarView.width or Config.SidebarWidth) + Signed)
+            SidebarView.width = NewWidth
+            SidebarView.update()
+
+        def OnDragEnd() -> None:
+            Config.SidebarWidth = int(SidebarView.width)
+            Config.Save()
+
+        return ResizeHandle("horizontal", None, OnDrag, OnDragEnd)
+
     def BuildOuterLayout() -> list[ft.Control]:
-        nonlocal SidebarView
+        nonlocal SidebarView, SidebarDivider
         Layout: list[ft.Control] = [BrowserView]
         if Config.ShowSidebar and (Config.ShowBookmarks or Config.ShowDevices or Config.ShowFiletree):
             SidebarView = Sidebar(
                 OnNavigate=BrowserView.NavigateTo, Config=Config, OnFilesMoved=BrowserView.Refresh
             )
+            SidebarDivider = _BuildSidebarWidthDivider()
             if Config.SidebarSide == "left":
-                Layout.insert(0, SidebarView)
+                Layout[0:0] = [SidebarView, SidebarDivider]
             else:
-                Layout.append(SidebarView)
+                Layout += [SidebarDivider, SidebarView]
         else:
             SidebarView = None
+            SidebarDivider = None
         return Layout
 
     def OnToggleSidebar() -> None:
@@ -111,6 +139,9 @@ def _BuildWindow(Config, StartPath: Path, **BrowserHooks) -> tuple[ft.Row, Brows
             return
         SidebarView.visible = Config.ShowSidebar
         SidebarView.update()
+        if SidebarDivider is not None:
+            SidebarDivider.visible = Config.ShowSidebar
+            SidebarDivider.update()
         if Config.ShowSidebar:
             SidebarView.UpdateSelection(BrowserView.CurrentPath)