fix: chip text and input backgrounds in both light/dark modes

Root fixes:
- .chip now has explicit color: var(--text) in base theme,
  not just dark — buttons no longer use browser default
- All inputs/selects/textareas get background: var(--surface)
  and color: var(--text) in both light and dark themes
- Removed color-scheme: dark on body (prevented browser from
  forcing dark form controls regardless of data-theme)
- Dark mode input override only changes background shade now

This fixes: unreadable chip text and always-dark inputs.

static/style.css

@@ -98,6 +98,8 @@ body {
     border: 1px solid var(--border);
     border-radius: 4px;
     font-size: 1rem;
+    background: var(--surface);
+    color: var(--text);
 }
 .form-card button[type="submit"] { margin-top: 20px; width: 100%; }
 .form-footer { margin-top: 16px; text-align: center; font-size: 0.85rem; color: var(--muted); }
@@ -133,6 +135,7 @@ body {
     border-radius: 4px;
     font-size: 1rem;
     background: var(--surface);
+    color: var(--text);
 }
 .hint { font-size: 0.8rem; color: var(--muted); margin-top: 4px; }
 
@@ -194,6 +197,7 @@ body {
 /* ── Chips ── */
 .chip {
     padding: 6px 18px;
+    color: var(--text);
     border: 2px solid var(--border);
     border-radius: 20px;
     background: var(--surface);
@@ -252,7 +256,15 @@ body {
 .manage-form .hint { margin-bottom: 8px; }
 .manage-form label { display: block; margin: 12px 0 4px; font-weight: 500; font-size: 0.85rem; }
 .manage-form input[type="text"],
-.manage-form input[type="password"] { width: 100%; padding: 6px 10px; border: 1px solid var(--border); border-radius: 4px; margin-bottom: 8px; }
+.manage-form input[type="password"] {
+    width: 100%;
+    padding: 6px 10px;
+    border: 1px solid var(--border);
+    border-radius: 4px;
+    margin-bottom: 8px;
+    background: var(--surface);
+    color: var(--text);
+}
 
 /* ── Language footer ── */
 .lang-footer {
@@ -379,9 +391,6 @@ body {
 }
 
 /* ── Dark mode overrides for non-variable colors ── */
-[data-theme="dark"] body {
-    color-scheme: dark;
-}
 [data-theme="dark"] .btn:hover {
     background: #2a2a4a;
 }
@@ -407,9 +416,6 @@ body {
 [data-theme="dark"] .chip-no.active {
     color: #1a1a2e;
 }
-[data-theme="dark"] .chip {
-    color: var(--text);
-}
 [data-theme="dark"] .badge {
     color: var(--text);
 }
@@ -449,7 +455,6 @@ body {
 [data-theme="dark"] select,
 [data-theme="dark"] textarea {
     background: #1a1a30;
-    color: var(--text);
     border-color: var(--border);
 }
 [data-theme="dark"] input::placeholder {