Add side panel and refactor title helpers

Introduce a `side_panel` flag throughout the skirmish state, board
creation,
and cell area calculation to enable a detachable side panel. Refactor
the
title helper to own its strings and use a static separator, updating the
single‑title helper accordingly. Add a new `SidePanelWidget` and expose
the
`skirmish_main_area_layout` helper. Extend keybindings with `Tab` and
`ShiftTab` actions under a new `Opener` group. Update structures and
units
to implement a `get_name` method and adjust related traits and imports.

src/app/states/skirmish_states/units/units_enum.rs

@@ -1,20 +1,43 @@
-use crate::app::states::skirmish_states::units::{MinerUnit, OptionalUnit, Unit};
+use crate::app::states::{
+    Players,
+    skirmish_states::units::{MinerUnit, Unit},
+};
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 pub enum Units {
     Miner(MinerUnit),
 }
 
-impl Units {
-    pub fn get_tag(&self) -> char {
+impl Unit for Units {
+    fn get_tag(&self) -> char {
         match self {
-            Units::Miner(m) => m.get_tag(),
+            Self::Miner(m) => m.get_tag(),
+        }
+    }
+
+    fn get_name(&self) -> &'static str {
+        match self {
+            Self::Miner(m) => m.get_name(),
+        }
+    }
+
+    fn get_owner(&self) -> Players {
+        match self {
+            Self::Miner(m) => m.get_owner(),
         }
     }
 }
 
-impl OptionalUnit for Option<Units> {
-    fn try_get_tag(&self) -> char {
+impl Unit for Option<Units> {
+    fn get_tag(&self) -> char {
         self.map_or(' ', |u| u.get_tag())
     }
+
+    fn get_name(&self) -> &'static str {
+        self.map_or("", |u| u.get_name())
+    }
+
+    fn get_owner(&self) -> Players {
+        self.map_or(Players::Enemy, |u| u.get_owner())
+    }
 }