refactor: Use jq for JSON pretty printing if available

**Changed**: Raw query analysis JSON formatting

**Before**:
- Custom 60+ line Lua JSON pretty printer
- Always used regardless of jq availability

**After**:
- Try `jq` first if available (best formatting)
- Fallback to compact JSON if jq not installed
- Simpler, cleaner code (removed 60+ lines)

**Why jq**:
- Industry standard JSON formatter
- Better formatting than custom implementation
- Already installed on most dev systems
- If not available, compact JSON is acceptable

**User Impact**:
- Users with jq get nicely formatted JSON
- Users without jq get compact but functional JSON
- No custom formatter to maintain

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Author: TimelordUK

nvim-plugin/lua/sql-cli/cli_analyzer.lua

@@ -309,14 +309,19 @@ function M.show_raw_analysis_popup(query)
     return
   end
 
-  -- Convert analysis to pretty JSON
+  -- Format JSON (use jq if available for pretty printing)
   local json_str = vim.fn.json_encode(analysis)
-  local ok, pretty_json = pcall(vim.fn.json_decode, json_str)
-  if ok then
-    json_str = vim.fn.json_encode(pretty_json)
+  if vim.fn.executable('jq') == 1 then
+    local jq_output = vim.fn.system('jq .', json_str)
+    if vim.v.shell_error == 0 then
+      json_str = jq_output
+      if log then
+        log.debug('cli_analyzer', 'Formatted JSON with jq')
+      end
+    end
   end
 
-  -- Format JSON with indentation
+  -- Split into lines
   local lines = {}
   for line in json_str:gmatch('[^\n]+') do
     table.insert(lines, line)