Method handle_completion_resolve

src/completion/resolve.rs:109–146

Handle `completionItem/resolve` by populating the `documentation` field with rich markdown. Reuses the existing hover methods ([`hover_for_method`], [`hover_for_property`], [`hover_for_constant`], [`hover_for_function`], [`hover_for_class_info`]) so that the documentation shown on selection is identical to what the user sees when hovering over a symbol. For union-type members (where `extra_class

(&self, mut item: CompletionItem)

    /// rule, deduplicating by declaring class.  This mirrors the inline
    /// hover behaviour for union member access.
    pub(crate) fn handle_completion_resolve(&self, mut item: CompletionItem) -> CompletionItem {
        let Some(ref data_value) = item.data else {
            return item;
        };

        let Ok(data) = serde_json::from_value::<CompletionItemData>(data_value.clone()) else {
            return item;
        };

        let ctx = self.file_context(&data.uri);
        let content = self.get_file_content(&data.uri).unwrap_or_default();

        match data.kind.as_str() {
            // ── Class member kinds ──────────────────────────────────
            "method" | "property" | "constant" => {
                self.resolve_member(&mut item, &data, &ctx, &content);
            }

            // ── Standalone function ─────────────────────────────────
            "function" => {
                self.resolve_function(&mut item, &data, &ctx, &content);
            }

            // ── Class / interface / trait / enum reference ───────────
            "class" => {
                self.resolve_class(&mut item, &data, &ctx, &content);
            }

            // ── Global constant (define / stub) ─────────────────────
            "global_constant" => {
                self.resolve_global_constant(&mut item, &data);
            }

            _ => {}
        }

        item
    }

    /// Resolve a class member (method, property, or constant).
    fn resolve_member(