fix(conversation): open cached perps actions locally

[SeniorZhai]

No description provided.

[Copilot]

Pull request overview

This PR improves how trade-related app-card actions are handled in conversations by attempting to open Perps/Spot trade actions directly in local screens when the needed market/token data is already cached, falling back to the existing URL/web handling otherwise.

Changes:

• Add URL parsing helpers (toPerpsTradeAction, toSpotTradeAction) to identify Perps vs Spot trade actions and extract parameters.
• Update ConversationFragment to open Perps/Spot trade actions locally when cache prerequisites are met.
• Add unit tests covering the new parsing behavior.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
app/src/test/java/one/mixin/android/ui/conversation/PerpsTradeActionTest.kt	Adds JVM tests for Spot/Perps trade action parsing.
app/src/main/java/one/mixin/android/ui/conversation/PerpsTradeAction.kt	Introduces Perps/Spot action models and URL parsing utilities.
app/src/main/java/one/mixin/android/ui/conversation/ConversationViewModel.kt	Adds an IO-thread helper to query cached token data by asset id.
app/src/main/java/one/mixin/android/ui/conversation/ConversationFragment.kt	Attempts local navigation for cached trade actions before falling back to openAsUrlOrWeb.

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