fix: make ComponentEmoji id and name optional

[RainyN0077]

Discord only includes the id field for custom emojis, not for standard unicode emojis (e.g. 🔗, 🟢, 🗑️). The current code defines id as required via Field(...) which causes pydantic ValidationError when receiving MESSAGE_UPDATE events containing button components with unicode emojis.

Root Cause

In nonebot/adapters/discord/api/model.py, ComponentEmoji is defined as:

class ComponentEmoji(BaseModel):
    id: str | None = Field(...)      # ← REQUIRED — but Discord omits it for unicode emojis
    name: str | None = Field(...)
    animated: Missing[bool] = UNSET

Per Discord API docs, the emoji in a button is a partial emoji where both id and name are optional.

Fix

Change id and name from required to optional while preserving Discord field semantics:

class ComponentEmoji(BaseModel):
    id: MissingOrNullable[Snowflake] = UNSET
    name: MissingOrNullable[str] = UNSET
    animated: Missing[bool] = UNSET

This follows Discord's nullable/optional field rules and models id as a Snowflake.

Tests

Added regression coverage for:

• unicode component emoji payloads such as {"name": "🔗"} where id is omitted
• custom component emoji payloads where id is nullable and parsed as Snowflake

Error before fix

pydantic_core._pydantic_core.ValidationError: 42 validation errors for union[GuildMessageUpdateEvent,DirectMessageUpdateEvent]
GuildMessageUpdateEvent.components.list[...].ActionRow.components.0.Button.emoji.ComponentEmoji.id
  Field required [type=missing, input_value={'name': '🔗'}, input_type=dict]

Closes #90

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.79%. Comparing base (66ea530) to head (1887900).

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #91      +/-   ##
==========================================
+ Coverage   75.76%   75.79%   +0.03%     
==========================================
  Files          40       40              
  Lines        7286     7297      +11     
  Branches      380      380              
==========================================
+ Hits         5520     5531      +11     
  Misses       1684     1684              
  Partials       82       82              

Flag	Coverage Δ
unittests	75.79% <100.00%> (+0.03%)	⬆️

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[shoucandanghehe]

lgtm, thx