fix: update timer adjustment button labels to reflect correct time change

Author: murdercode

src/index.html

@@ -97,17 +97,15 @@
       <div style="text-align:center; position: relative">
         <div class="timer-status-container">
           <button class="timer-adjust-btn" id="timer-minus-btn" title="Subtract 5 minutes">
-            <i class="ri-subtract-line"></i>
-            <span>5</span>
+            <span>-5</span>
           </button>
           <div class="timer-status clickable" id="timer-status">
             <i id="status-icon" class="ri-brain-line"></i>
             <span id="status-text">Focus</span>
             <i class="ri-arrow-down-s-line tag-dropdown-arrow" id="tag-dropdown-arrow"></i>
           </div>
           <button class="timer-adjust-btn" id="timer-plus-btn" title="Add 5 minutes">
-            <i class="ri-add-line"></i>
-            <span>5</span>
+            <span>+5</span>
           </button>
         </div>
         <!-- Tag Dropdown Menu -->