Remove clear button to simplify UI

The clear button was unnecessary clutter - users can simply select and delete
text in the input field if they want to clear it.

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

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

app/styles.css

@@ -270,33 +270,6 @@ textarea:focus {
     }
 }
 
-.clear-btn {
-    width: 100%;
-    padding: 15px;
-    background: transparent;
-    border: 2px solid var(--accent);
-    border-radius: 12px;
-    color: var(--accent);
-    font-size: 1rem;
-    font-weight: 600;
-    text-transform: uppercase;
-    letter-spacing: 1px;
-    cursor: pointer;
-    transition: all 0.3s ease;
-    margin-top: 20px;
-}
-
-.clear-btn:hover {
-    background: var(--accent);
-    color: var(--bg-primary);
-    box-shadow: 0 0 30px var(--shadow);
-    transform: translateY(-2px);
-}
-
-.clear-btn:active {
-    transform: translateY(0);
-}
-
 footer {
     text-align: center;
     margin-top: 30px;
@@ -374,11 +347,6 @@ footer p {
         padding: 15px;
     }
 
-    .clear-btn {
-        padding: 18px;
-        font-size: 1.1rem;
-    }
-
     .copy-notification {
         padding: 15px 25px;
         font-size: 1rem;
@@ -422,10 +390,6 @@ footer p {
         padding: 15px;
     }
 
-    .clear-btn {
-        min-height: 48px; /* Minimum touch target size */
-    }
-
     #outputText {
         cursor: pointer;
         -webkit-user-select: all;
@@ -486,8 +450,4 @@ footer p {
         box-shadow: none;
         border: 1px solid #ccc;
     }
-
-    .clear-btn {
-        display: none;
-    }
 }