fix: file-tree returns full depth for treemap drill-down

The /api/file-tree endpoint was capping depth at maxDepth (10), causing
directories deeper than 10 levels to have empty children. The frontend
treemap couldn't drill into them and directory node counts were wrong.

Fix: when no depth param is passed, return the full tree (null depth =
unlimited). The treemap needs the complete hierarchy for drill-down and
correct proportional sizing.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: aksOps

src/main/java/io/github/randomcodespace/iq/api/GraphController.java

@@ -207,8 +207,9 @@ public Map<String, Object> getFileTree(
             @RequestParam(required = false) Integer depth,
             @RequestParam(required = false) Integer maxFiles) {
         requireQueryService();
-        int cappedDepth = (depth != null) ? Math.min(depth, config.getMaxDepth()) : config.getMaxDepth();
-        // Default unlimited for treemap; pass maxFiles to limit if needed
+        // depth=null means unlimited (full tree for treemap). Otherwise cap at maxDepth.
+        Integer cappedDepth = (depth != null) ? Math.min(depth, config.getMaxDepth()) : null;
+        // Default unlimited for treemap
         int limit = (maxFiles != null) ? maxFiles : Integer.MAX_VALUE;
         return queryService.getFileTree(cappedDepth, limit);
     }

src/test/java/io/github/randomcodespace/iq/api/GraphControllerTest.java

@@ -567,7 +567,7 @@ void getFileTreeShouldReturnHierarchicalTree() throws Exception {
                 Map.of("name", "src", "type", "directory", "nodeCount", 10L, "children", List.of()),
                 Map.of("name", "pom.xml", "type", "file", "nodeCount", 1L, "children", List.of())));
         treeResult.put("total_files", 3L);
-        when(queryService.getFileTree(anyInt(), anyInt())).thenReturn(treeResult);
+        when(queryService.getFileTree(any(), anyInt())).thenReturn(treeResult);
 
         mockMvc.perform(get("/api/file-tree"))
                 .andExpect(status().isOk())