feat: Warn when binding browser-reserved shortcuts (#9406)

## Summary

Show a non-blocking warning in the keybinding edit dialog when users try
to bind shortcuts that browsers intercept (e.g. Ctrl+T, Ctrl+W, F12).

## Changes

- **What**: Add `RESERVED_BY_BROWSER` set of known browser-intercepted
shortcuts, `isBrowserReserved` getter on `KeyComboImpl`, and a warning
`<Message>` in the keybinding edit dialog. Users can still save the
binding.

## Review Focus

Whether the list of browser-reserved shortcuts is comprehensive enough,
and whether a non-blocking warning (vs blocking) is the right UX choice.

## Before


https://github.com/user-attachments/assets/5abfc062-5ed1-4fcd-b394-ff98221d82a8

## After



https://github.com/user-attachments/assets/12a49e24-051f-4579-894a-164dbf1cb7b7


Fixes #1087

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-9406-feat-Warn-when-binding-browser-reserved-shortcuts-31a6d73d36508162a021e88ab76914f6)
by [Unito](https://www.unito.io)

---------

Co-authored-by: Kelly Yang <124ykl@gmail.com>
Co-authored-by: Alexander Brown <drjkl@comfy.org>
Co-authored-by: Christian Byrne <cbyrne@comfy.org>
Co-authored-by: jaeone94 <89377375+jaeone94@users.noreply.github.com>
Co-authored-by: Benjamin Lu <benjaminlu1107@gmail.com>
Co-authored-by: Comfy Org PR Bot <snomiao+comfy-pr@gmail.com>
Co-authored-by: christian-byrne <72887196+christian-byrne@users.noreply.github.com>
Co-authored-by: github-actions <github-actions@github.com>
Co-authored-by: AustinMroz <austin@comfy.org>
Co-authored-by: GitHub Action <action@github.com>
Co-authored-by: Terry Jia <terryjia88@gmail.com>
Co-authored-by: Alexander Brown <DrJKL0424@gmail.com>
Co-authored-by: Dante <bunggl@naver.com>
Co-authored-by: Deep Mehta <42841935+deepme987@users.noreply.github.com>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
Co-authored-by: Amp <amp@ampcode.com>
Co-authored-by: Jin Yi <jin12cc@gmail.com>
Co-authored-by: Yourz <crazilou@vip.qq.com>
Co-authored-by: pythongosssss <125205205+pythongosssss@users.noreply.github.com>

src/components/dialog/content/setting/keybinding/EditKeybindingContent.vue

@@ -0,0 +1,56 @@
+<template>
+  <div class="flex w-96 flex-col border-t border-border-default px-4">
+    <p class="mb-4 text-sm text-muted-foreground">
+      {{ $t('g.setAKeybindingForTheFollowing') }}
+    </p>
+    <div class="mb-4 text-sm text-base-foreground">
+      {{ commandLabel }}
+    </div>
+
+    <input
+      class="text-foreground mb-4 w-full rounded-sm border border-border-default bg-secondary-background px-3 py-2 text-center shadow-none focus:outline-none"
+      :value="dialogState.newCombo?.toString() ?? ''"
+      :placeholder="$t('g.enterYourKeybind')"
+      :aria-label="$t('g.enterYourKeybind')"
+      autocomplete="off"
+      autofocus
+      @keydown.stop.prevent="captureKeybinding"
+    />
+    <div class="min-h-12">
+      <p
+        v-if="dialogState.newCombo?.isBrowserReserved"
+        class="m-0 text-sm text-destructive-background"
+      >
+        {{ $t('g.browserReservedKeybinding') }}
+      </p>
+      <p
+        v-else-if="existingKeybindingOnCombo"
+        class="m-0 text-sm text-destructive-background"
+      >
+        {{ $t('g.keybindingAlreadyExists') }}
+        {{ existingKeybindingOnCombo.commandId }}
+      </p>
+    </div>
+  </div>
+</template>
+
+<script setup lang="ts">
+import type { KeybindingImpl } from '@/platform/keybindings/keybinding'
+import { KeyComboImpl } from '@/platform/keybindings/keyCombo'
+
+import type { EditKeybindingDialogState } from '@/composables/useEditKeybindingDialog'
+
+const { dialogState, onUpdateCombo, existingKeybindingOnCombo } = defineProps<{
+  dialogState: EditKeybindingDialogState
+  commandLabel: string
+  onUpdateCombo: (combo: KeyComboImpl) => void
+  existingKeybindingOnCombo: KeybindingImpl | null
+}>()
+
+function captureKeybinding(event: KeyboardEvent) {
+  if (!event.shiftKey && !event.altKey && !event.ctrlKey && !event.metaKey) {
+    if (event.key === 'Escape') return
+  }
+  onUpdateCombo(KeyComboImpl.fromEvent(event))
+}
+</script>