Colour the host's file rows by what their mode says

The remote pane's NAME column was blue for a directory and plain for everything
else, and the PERMS column was faint whatever it said. Two colours now come off
the mode, split across those two columns on purpose: NAME says what a row is,
so a file with an execute bit is green there, and PERMS says what is notable
about how it is set, so a file anyone may write to is amber over the characters
that actually say so. Because the two never compete for one TextBlock, a
world-writable executable shows both facts instead of one winning an argument.
No new blue is spent, which is what App.axaml asks for: it reserves blue for a
directory, a distinct scope, and calls it deliberately rare.

Both are files only, and each exclusion is a wrong answer avoided rather than a
case not got to. Every symbolic link is lrwxrwxrwx by convention and its mode
governs nothing — what may be written is the target, whose mode an lstat
listing never fetched — so amber there would fire on every link on the host. A
world-writable directory is /tmp, made safe by a sticky bit PosixMode does not
render, and warning about it would be warning about the half of the mode that
is on screen while the half that answers the warning is not. And the execute
bit on a directory means "may be searched", which is true of very nearly every
directory a host has, so green there would paint the whole pane and mark
nothing.

The two questions read back the string PosixMode wrote rather than carrying its
nine booleans through SftpEntry as well. That is the point rather than a
shortcut: two representations of one fact is how a row ends up coloured for a
bit the column beside it does not show. A mode of the wrong length answers
false rather than throwing, since these decide a colour and a listing is not
worth failing over one.

The amber is Warn rather than WarnText, which is the muted amber a warning card
writes its sentences in. At 9.5px against TextFaint that one is a shade rather
than a signal, and a marker nobody notices is the same as no marker.

The local pane is untouched, on the grounds it already gives for having no
PERMS column at all: a POSIX mode is not a fact about a file on Windows, and
colouring one there would invent exactly what the column declines to print.

Twenty cases in RemotePathTests, which needs no container — the execute bit in
any of the three triples rather than only the owner's, the others-write bit
alone, a mode of the wrong length, and the file-only rule for both questions
from all three kinds. dotnet format is clean and the app and layout suites pass
at 109 and 35.

src/DodoSSH.Client.App/ViewModels/TransfersViewModel.cs

@@ -37,6 +37,12 @@ internal sealed class RemoteEntryRowViewModel(SftpEntry entry)
 
     /// <summary>The mode as <c>drwxr-xr-x</c>, which is the design's <c>PERMS</c> column.</summary>
     internal string Permissions => entry.Permissions;
+
+    /// <summary>Whether the row is a file with an execute bit, which the NAME column colours for.</summary>
+    internal bool IsExecutable => entry.IsExecutable;
+
+    /// <summary>Whether the row is a file anyone may write to, which the PERMS column colours for.</summary>
+    internal bool IsWorldWritable => entry.IsWorldWritable;
 }
 
 /// <summary>One local file or directory, as a row.</summary>

src/DodoSSH.Client.App/Views/TransfersScreen.axaml

@@ -23,6 +23,16 @@
       A directory is marked by colour rather than by an icon: this application ships no icon set, and the
       palette already reserves blue for "a directory, a distinct scope" — see App.axaml, where it is
       described as deliberately rare. This is the one place it is spent.
+
+      Two further colours come from the mode, and they are split across the two columns on purpose: NAME says
+      what a row is, PERMS says what is notable about how it is set. So an executable is green in NAME —
+      "live, yours, something that runs" — while a file anyone may write to is amber in PERMS, over the
+      characters that actually say so. The two never compete for one TextBlock, which is what lets a
+      world-writable executable show both facts instead of one winning an argument.
+
+      Both are files only; see SftpEntry, which will not read a mode off a symbolic link or a directory.
+      Rendering `-rwxrwxrwx` in two colours at once is not something this list can do, so amber over the whole
+      string is the compromise: the eye lands on the column, and the string itself is the detail.
     -->
     <Style Selector="TextBlock.entry">
       <Setter Property="Foreground" Value="{StaticResource Text}" />
@@ -30,6 +40,25 @@
     <Style Selector="TextBlock.entry.dir">
       <Setter Property="Foreground" Value="{StaticResource Info}" />
     </Style>
+    <Style Selector="TextBlock.entry.exec">
+      <Setter Property="Foreground" Value="{StaticResource Accent}" />
+    </Style>
+
+    <!--
+      Faint by default, as this column has always been: a mode is there so its absence would be noticed. It
+      steps up to amber only when it has something to say, which is the whole reason the default is quiet.
+    -->
+    <Style Selector="TextBlock.perms">
+      <Setter Property="Foreground" Value="{StaticResource TextFaint}" />
+    </Style>
+    <!--
+      Warn rather than WarnText, which is the muted amber a warning card writes its sentences in. At 9.5px
+      against TextFaint that one is a shade, not a signal, and a marker nobody notices is the same as no
+      marker at all.
+    -->
+    <Style Selector="TextBlock.perms.loose">
+      <Setter Property="Foreground" Value="{StaticResource Warn}" />
+    </Style>
   </UserControl.Styles>
 
   <Grid RowDefinitions="44,*,Auto">
@@ -291,14 +320,15 @@
               <Grid ColumnDefinitions="2,*,84,110,92" Margin="0,5,12,5">
                 <Border Grid.Column="0" Classes="rowmark" />
                 <TextBlock Grid.Column="1" Classes="mono entry" Classes.dir="{Binding IsNavigable}"
+                           Classes.exec="{Binding IsExecutable}"
                            Text="{Binding Name}" FontSize="11"
                            Margin="12,0,8,0" TextTrimming="CharacterEllipsis" />
                 <TextBlock Grid.Column="2" Classes="mono" Text="{Binding Size}" FontSize="9.5"
                            Foreground="{StaticResource TextDim}" VerticalAlignment="Center" />
                 <TextBlock Grid.Column="3" Classes="mono" Text="{Binding Modified}" FontSize="9.5"
                            Foreground="{StaticResource TextFaint}" VerticalAlignment="Center" />
-                <TextBlock Grid.Column="4" Classes="mono" Text="{Binding Permissions}" FontSize="9.5"
-                           Foreground="{StaticResource TextFaint}" VerticalAlignment="Center" />
+                <TextBlock Grid.Column="4" Classes="mono perms" Classes.loose="{Binding IsWorldWritable}"
+                           Text="{Binding Permissions}" FontSize="9.5" VerticalAlignment="Center" />
               </Grid>
             </DataTemplate>
           </ListBox.ItemTemplate>