fix: tab completion cursor positioning and code formatting

Fix tab completion cursor bug where the cursor would jump to incorrect
position after autocompleting filenames or paths. The cursor now correctly
moves to the end of the completed text.

Changes:
- Fix cursor position after tab completion in index.html
  When tab completion updates the command line ($current), also update
  $cursorPos to match the new length. This prevents cursor quirks and
  incorrect positioning when typing after completion.

- Fix code formatting in main.go
  Correct indentation inconsistency in autocomplete handler (lines 2815-2816)
  from spaces to tabs to match project style.

Fixes reported issue where:
- Tab completion caused cursor to appear in wrong position
- Subsequent typing would insert characters at incorrect location

Author: puria

index.html

@@ -885,9 +885,11 @@
 
                if (lcp && lcp !== basePart) {
                  $current = cmd + ' ' + flagsPart + (dirPart + lcp);
+                 $cursorPos = $current.length; // Fix cursor position
                } else if (items.length === 1) {
                  const one = items[0];
                  $current = cmd + ' ' + flagsPart + (dirPart + one.name + (one.dir ? '/' : ''));
+                 $cursorPos = $current.length; // Fix cursor position
                } else {
                  const list = items.map(it => it.name + (it.dir ? '/' : '')).join('  ');
                  $buffer += `<div class='line out'>${makeClickable(ansiToHtml(list))}</div>`;

main.go

@@ -2812,8 +2812,8 @@ func (s *server) handleComplete(w http.ResponseWriter, r *http.Request) {
 				}
 				if req.TextOnly {
 					// Use file category to check if viewable (text or image)
-          cat := getFileCategory(name)
-          if !(cat == FileCategoryText || cat == FileCategoryImage) {
+					cat := getFileCategory(name)
+					if !(cat == FileCategoryText || cat == FileCategoryImage) {
 						continue
 					}
 				}