Add note on keymaps to home page, allow moving cursor in confirmation…

… dialog using arrow keys

docs/overrides/home.html

@@ -1696,7 +1696,10 @@ <h2 class="feature-title">
           </p>
           <p class="feature-description">
             Adjust the user interface to your liking through the <span data-text="configuration system" class="gradient-text subtle-purple-glow">configuration system</span> or at runtime.
-          </p>  
+          </p>
+          <p class="feature-description">
+            Customize keybindings to your liking using the <span data-text="keymap" class="gradient-text subtle-purple-glow">keymap</span> system.
+          </p>
         </div>
         <div class="feature-image">
           <img src="assets/themes.png" alt="A selection of Posting's themes stacked on top of each other.">

src/posting/widgets/confirmation.py

@@ -3,6 +3,7 @@
 from typing import Literal
 from textual import on
 from textual.app import ComposeResult
+from textual.binding import Binding
 from textual.containers import Horizontal, Vertical
 from textual.screen import ModalScreen
 from textual.widgets import Button, Static
@@ -26,6 +27,15 @@ class ConfirmationModal(ModalScreen[bool]):
     }
     """
 
+    BINDINGS = [
+        Binding(
+            "left,right,up,down,h,j,k,l",
+            "move_focus",
+            "Navigate",
+            show=False,
+        )
+    ]
+
     def __init__(
         self,
         message: str,
@@ -68,3 +78,7 @@ def confirm(self) -> None:
     @on(Button.Pressed, "#cancel-button")
     def cancel(self) -> None:
         self.dismiss(False)
+
+    def action_move_focus(self) -> None:
+        # It's enough to just call focus_next here as there are only two buttons.
+        self.screen.focus_next()