El IDE: 10-round pass — syntax highlighting, file browser, runner, completion, split panes, find/replace, settings, minimap

Round 1: Fix dependency paths (../el/crates → ../el/engrams), verify build
Round 2: Enhanced syntax highlighting — function call detection, all El keywords (activate, sealed, parallel, deploy, etc.)
Round 3: Full El keyword set in CodeMirror tokenizer and completions; 50+ builtin function completions with type signatures
Round 4: File system integration — mkdir, rename, delete, file tree search; git status badges
Round 5: Runner integration — Ctrl+R shortcut, SSE streaming output, clickable error lines with jump-to-line
Round 6: Error highlighting with accurate line/col from lexer/parser spans; diagnostic dedup
Round 7: Find/replace panel; Ctrl+G go-to-line; toggle line comment; word-wrap compartment fix
Round 8: Code completion — 50+ builtins, keyword completions, snippet completions, server snippet integration
Round 9: Resizable panels — file tree drag-resize + collapse (Ctrl+B), type-graph drag-resize, bottom panel toggle (Ctrl+J), width persistence
Round 10: Settings API (GET/POST/DELETE /api/settings, ~/.el-ide/settings.json); frontend wired to API with debounced save; theme persistence
Round 11: Minimap click-to-jump and drag-to-scroll
Round 12: Command palette — added Go To Line, Toggle Word Wrap/Minimap/File Tree/Bottom Panel, font size commands, New File, Select Next Occurrence
Round 13: Multi-cursor — Ctrl+D select next occurrence, EditorSelection exposed for multi-range selection

crates/el-lsp/src/diagnostic.rs

@@ -31,7 +31,12 @@ pub fn check(source: &str) -> Vec<Diagnostic> {
     let tokens = match el_lexer::tokenize(source) {
         Ok(t) => t,
         Err(e) => {
-            out.push(Diagnostic::error(format!("Lex error: {e}")));
+            out.push(Diagnostic {
+                message: format!("Lex error: {}", e.kind),
+                severity: "error".into(),
+                line: Some(e.span.line),
+                col: Some(e.span.col),
+            });
             return out;
         }
     };
@@ -39,7 +44,12 @@ pub fn check(source: &str) -> Vec<Diagnostic> {
     let program = match el_parser::parse(tokens, source.to_string()) {
         Ok(p) => p,
         Err(e) => {
-            out.push(Diagnostic::error(format!("Parse error: {e}")));
+            out.push(Diagnostic {
+                message: format!("Parse error: {}", e.kind),
+                severity: "error".into(),
+                line: Some(e.span.line),
+                col: Some(e.span.col),
+            });
             return out;
         }
     };