feat: implement right-click as mirror for long-click across shared UI

This commit introduces a new `Modifier.onRightClick` extension to improve desktop usability by mapping secondary mouse clicks to existing long-click actions. It also removes the legacy desktop `MenuBar` implementation in favor of this more consistent cross-platform UX approach.

Specific changes include:
- **Core UI**: Added `Modifier.onRightClick` in `ModifierExtensions.kt` using `PointerButton.Secondary` to detect right-clicks on desktop platforms.
- **Desktop**: Removed the `MenuBar` and associated keyboard shortcuts from the main entry point.
- **Messaging Feature**: Added right-click support to `MessageItem`, `Reaction`, and `ContactItem`.
- **Node Feature**:
    - Added right-click support to `NodeItem`, `NodeDetailsSection`, `NodeDetailComponents`, and `InfoCard` to trigger copy actions or context menus.
    - Updated `TracerouteLog`, `NeighborInfoLog`, and `NodeItem` to handle right-click events.
- **Connections Feature**: Updated `DeviceListItem` to support right-click for deletion/context actions.
- **Documentation**: Updated `roadmap.md` to reflect the completion of right-click UX integration.

Signed-off-by: James Rich <2199651+jamesarich@users.noreply.github.com>

core/ui/src/commonMain/kotlin/org/meshtastic/core/ui/util/ModifierExtensions.kt

@@ -16,7 +16,12 @@
  */
 package org.meshtastic.core.ui.util
 
+import androidx.compose.foundation.gestures.awaitEachGesture
+import androidx.compose.ui.ExperimentalComposeUiApi
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.input.pointer.PointerButton
+import androidx.compose.ui.input.pointer.PointerEventType
+import androidx.compose.ui.input.pointer.pointerInput
 
 /**
  * Conditionally applies the [action] to the receiver [Modifier] if [precondition] is true. Otherwise, returns the
@@ -24,3 +29,18 @@ import androidx.compose.ui.Modifier
  */
 inline fun Modifier.thenIf(precondition: Boolean, action: Modifier.() -> Modifier): Modifier =
     if (precondition) action() else this
+
+/**
+ * Adds a secondary (right) mouse-button click handler. On touch-only platforms the secondary button event never fires,
+ * so this is a safe no-op. Intended to mirror `onLongClick` behavior for desktop users who expect right-click context
+ * actions.
+ */
+@OptIn(ExperimentalComposeUiApi::class)
+fun Modifier.onRightClick(action: () -> Unit): Modifier = pointerInput(action) {
+    awaitEachGesture {
+        val event = awaitPointerEvent()
+        if (event.type == PointerEventType.Press && event.button == PointerButton.Secondary) {
+            action()
+        }
+    }
+}