rework minimap, toolbox, and menu designs with unified theming (#6038)

## Summary

This PR redesigns the graph canvas interface components including
minimap, toolbox, and menu systems with updated spacing, colors, and
interaction patterns - using the design tokens directly from Figma,
which can be used elsewhere going forward.

There are some other changes to the designs, outlined
[here](https://www.notion.so/comfy-org/Update-Minimap-Menu-v2-2886d73d365080e88e12f8df027019c0):

- [x]  Update/standardize the padding between viewport and toolbox
- [x] Update toolbox component’s style to match the other floating menus
style (border radius, height, padding and follow theme colors)
- [x]  Expose the minimap button
- [x]  Remove the focus button and delete it’s keybinding
- [x]  Group the hand and the default cursor buttons


https://github.com/user-attachments/assets/92542e60-c32d-4a21-a6f6-e72837a70b17

## Review Focus

New CSS variables for cross-component theming consistency and
CanvasModeSelector component extraction for improved code organization.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6038-rework-minimap-toolbox-and-menu-designs-with-unified-theming-28b6d73d36508191a0c6cf8036d965c4)
by [Unito](https://www.unito.io)

---------

Co-authored-by: github-actions <github-actions@github.com>

src/components/graph/CanvasModeSelector.vue

@@ -0,0 +1,126 @@
+<template>
+  <Button
+    ref="buttonRef"
+    severity="secondary"
+    class="group h-8 rounded-none! bg-interface-panel-surface p-0 transition-none! hover:rounded-lg! hover:bg-button-hover-surface!"
+    :style="buttonStyles"
+    @click="toggle"
+  >
+    <template #default>
+      <div class="flex items-center gap-1 pr-0.5">
+        <div
+          class="rounded-lg bg-button-active-surface p-2 group-hover:bg-button-hover-surface"
+        >
+          <i :class="currentModeIcon" class="block h-4 w-4" />
+        </div>
+        <i class="icon-[lucide--chevron-down] block h-4 w-4 pr-1.5" />
+      </div>
+    </template>
+  </Button>
+
+  <Popover
+    ref="popover"
+    :auto-z-index="true"
+    :base-z-index="1000"
+    :dismissable="true"
+    :close-on-escape="true"
+    unstyled
+    :pt="popoverPt"
+  >
+    <div class="flex flex-col gap-1">
+      <div
+        class="flex cursor-pointer items-center justify-between px-3 py-2 text-sm hover:bg-node-component-surface-hovered"
+        @click="setMode('select')"
+      >
+        <div class="flex items-center gap-2">
+          <i class="icon-[lucide--mouse-pointer-2] h-4 w-4" />
+          <span>{{ $t('graphCanvasMenu.select') }}</span>
+        </div>
+        <span class="text-[9px] text-text-primary">{{
+          unlockCommandText
+        }}</span>
+      </div>
+
+      <div
+        class="flex cursor-pointer items-center justify-between rounded px-3 py-2 text-sm hover:bg-node-component-surface-hovered"
+        @click="setMode('hand')"
+      >
+        <div class="flex items-center gap-2">
+          <i class="icon-[lucide--hand] h-4 w-4" />
+          <span>{{ $t('graphCanvasMenu.hand') }}</span>
+        </div>
+        <span class="text-[9px] text-text-primary">{{ lockCommandText }}</span>
+      </div>
+    </div>
+  </Popover>
+</template>
+
+<script setup lang="ts">
+import Button from 'primevue/button'
+import Popover from 'primevue/popover'
+import { computed, ref } from 'vue'
+
+import { useCanvasStore } from '@/renderer/core/canvas/canvasStore'
+import { useCommandStore } from '@/stores/commandStore'
+
+interface Props {
+  buttonStyles?: Record<string, string>
+}
+
+defineProps<Props>()
+const buttonRef = ref<InstanceType<typeof Button>>()
+const popover = ref<InstanceType<typeof Popover>>()
+const commandStore = useCommandStore()
+const canvasStore = useCanvasStore()
+
+const isCanvasReadOnly = computed(() => canvasStore.canvas?.read_only ?? false)
+
+const currentModeIcon = computed(() =>
+  isCanvasReadOnly.value
+    ? 'icon-[lucide--hand]'
+    : 'icon-[lucide--mouse-pointer-2]'
+)
+
+const unlockCommandText = computed(() =>
+  commandStore
+    .formatKeySequence(commandStore.getCommand('Comfy.Canvas.Unlock'))
+    .toUpperCase()
+)
+
+const lockCommandText = computed(() =>
+  commandStore
+    .formatKeySequence(commandStore.getCommand('Comfy.Canvas.Lock'))
+    .toUpperCase()
+)
+
+const toggle = (event: Event) => {
+  const el = (buttonRef.value as any)?.$el || buttonRef.value
+  popover.value?.toggle(event, el)
+}
+
+const setMode = (mode: 'select' | 'hand') => {
+  if (mode === 'select' && isCanvasReadOnly.value) {
+    void commandStore.execute('Comfy.Canvas.Unlock')
+  } else if (mode === 'hand' && !isCanvasReadOnly.value) {
+    void commandStore.execute('Comfy.Canvas.Lock')
+  }
+  popover.value?.hide()
+}
+
+const popoverPt = computed(() => ({
+  root: {
+    class: 'absolute z-50 -translate-y-2'
+  },
+  content: {
+    class: [
+      'mb-2 text-text-primary',
+      'shadow-lg border border-node-border',
+      'bg-nav-background',
+      'rounded-lg',
+      'p-2 px-3',
+      'min-w-39',
+      'select-none'
+    ]
+  }
+}))
+</script>