Agent sessions: store archived/unread state in profile scope

[Copilot]

Moves agent session archived/unread state from workspace to profile scope, enabling cross-workspace session management (e.g., archiving a Codex session reflects everywhere).

Changes

• saveSessionStates(): Store to StorageScope.PROFILE instead of StorageScope.WORKSPACE
• loadSessionStates(): Load from profile scope first; if empty, migrate from workspace scope and clean up old data

Migration

Existing workspace-scoped state is automatically migrated on first load:

// Try profile scope first (new location)
let statesCache = this.storageService.get(STATE_STORAGE_KEY, StorageScope.PROFILE);

// Migration: check workspace scope (old location) and migrate if found
if (!statesCache) {
    statesCache = this.storageService.get(STATE_STORAGE_KEY, StorageScope.WORKSPACE);
    if (statesCache) {
        this.storageService.store(STATE_STORAGE_KEY, statesCache, StorageScope.PROFILE, StorageTarget.MACHINE);
        this.storageService.remove(STATE_STORAGE_KEY, StorageScope.WORKSPACE);
    }
}

Original prompt

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This section details on the original issue you should resolve

<issue_title>Agent sessions: consider to store archived/unread state in global scope</issue_title>
<issue_description>This would help getting rid of sessions across all workspaces, such as for Codex. This requires a migration of the existing data though. </issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes ⛔ Agent sessions: migrate state storage to application and user #286494

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