fix: parse tool_use/tool_result messages and add OpenCode SQLite backend (#1401)

* fix: parse tool_use/tool_result messages and add OpenCode SQLite backend

  - Claude: reclassify user messages containing tool_result as "tool" role
  - Codex: handle function_call and function_call_output payload types
  - Gemini: support array content and toolCalls extraction, filter info/error types
  - OpenCode: add SQLite session scan, load and delete alongside legacy JSON
  - utils: extend parse_timestamp_to_ms for integer timestamps, extract tool_use/tool_result in shared extract_text

* fix: address remaining issues from tool_use/tool_result parsing commit
  - Claude: fix role misclassification for mixed user+tool_result messages (any → all)
  - OpenCode: extract duplicate part text logic into extract_part_text()
  - OpenCode: add path validation for SQLite delete to prevent foreign DB access
  - OpenCode: wrap SQLite deletion in transaction for atomicity
  - openclaw_config: remove redundant as_deref() on Option<&str>

src-tauri/src/session_manager/mod.rs

@@ -69,6 +69,11 @@ pub fn scan_sessions() -> Vec<SessionMeta> {
 }
 
 pub fn load_messages(provider_id: &str, source_path: &str) -> Result<Vec<SessionMessage>, String> {
+    // OpenCode SQLite sessions use a "sqlite:" prefixed source_path
+    if provider_id == "opencode" && source_path.starts_with("sqlite:") {
+        return opencode::load_messages_sqlite(source_path);
+    }
+
     let path = Path::new(source_path);
     match provider_id {
         "codex" => codex::load_messages(path),
@@ -85,6 +90,11 @@ pub fn delete_session(
     session_id: &str,
     source_path: &str,
 ) -> Result<bool, String> {
+    // OpenCode SQLite sessions bypass the file-based deletion path
+    if provider_id == "opencode" && source_path.starts_with("sqlite:") {
+        return opencode::delete_session_sqlite(session_id, source_path);
+    }
+
     let root = provider_root(provider_id)?;
     delete_session_with_root(provider_id, session_id, Path::new(source_path), &root)
 }