Fixes#14519
## Summary
On macOS, the Option key combined with a letter produces locale input
characters (e.g. Polish layout: Option+S → `ś`, Option+L → `ł`). The
AFFiNE command registry registers shortcuts like `Alt+KeyS` (used for
Page ↔ Edgeless mode switch) via `tinykeys`, which matches on
`event.code` (the physical key) — so it fires even when the user was
actually typing a non-ASCII character.
Reported in #14519: Polish users cannot type `ś` inside AFFiNE because
Option+S triggers the mode switch instead.
## Fix
In the command registry handler
([registry.ts](packages/frontend/core/src/commands/registry/registry.ts)),
skip the command when Alt is the only modifier **and** the key produced
a non-ASCII character — the user intends to type the character, not
invoke the shortcut.
Matches the existing handling in blocksuite's `keymap.ts` (added for the
same class of issue in #14059).
## Demo
https://github.com/user-attachments/assets/eb6d2e69-39bf-4236-a886-9e2bde425626
## Verified locally (macOS)
- Switched input source to Polish
- Typed `właśnie` in an AFFiNE doc — all characters including `ś`
(Option+S), `ł` (Option+L) now produce the correct output
- Previously Option+S would toggle edgeless mode
- US layout (Option+S → `ß`) and other locale chars (ą, ń, ę) also now
pass through correctly
- Regular Cmd-based shortcuts (Cmd+K, Cmd+S, etc.) unaffected because
the guard excludes `metaKey`
## Test plan
- [x] On macOS, add Polish input source (System Settings → Keyboard →
Input Sources → +)
- [x] Switch to Polish layout
- [x] In any AFFiNE doc, type Option+S → `ś` appears (not mode switch)
- [x] Confirm other shortcuts (Cmd+K, Cmd+Enter, etc.) still work
- [x] Confirm on US layout that Option+S produces `ß` (OS default)
without firing the mode switch
<!-- This is an auto-generated comment: release notes by coderabbit.ai
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## Summary by CodeRabbit
* **Bug Fixes**
* Fixed keyboard event handling with Alt key and non-ASCII characters to
prevent unintended command execution.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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