[BUG] dynarray_insert() has same double capacity increase bug as push()

[seesee010]

Bug Description

dynarray_insert() has the same double capacity increase bug as dynarray_push().

Location

src/modify.c lines 164-170

Current Code

if (array->length >= array->capacity) {
    if (!dynarray_inc(array, array->capacity)) {
        return false;
    }
}

array->capacity *= 2;  // ← Doubles capacity AGAIN after inc() already did!

Problem

Same as bug #4 in dynarray_push():

1. dynarray_inc() already increases capacity
2. Then multiplication happens again
3. Results in exponential memory waste

Expected Behavior

Should only resize once.

Proposed Fix

if (array->length >= array->capacity) {
    size_t new_capacity = array->capacity * 2;
    if (!dynarray_setSize(array, new_capacity)) {
        return false;
    }
}
// Remove the extra capacity *= 2 line

Related Issue

This is the same root cause as the push() capacity bug

Impact

• Severity: Medium
• Memory waste
• Less critical than push() because insert() is used less frequently