fix(readmymind): style the modal footer, point the empty-result copy at the steer note

The footer buttons shipped with class="btn btn-secondary/primary", but no
.btn or .btn-secondary rule exists in this codebase, so all four rendered
as unstyled UA buttons. Moved them to the btn-toolbar convention every
other modal footer uses, with a scoped flex-row footer rule (btn-toolbar
is display:flex, block-level) mirroring the runSummaryModal footer.

Send's accent needs a (0,4,0) re-assert: the skin block's bare
.btn-toolbar rule is (0,2,1) under html:not([data-skin="og"]) and beats
.btn-toolbar.btn-primary (0,2,0), the same specificity trap CLAUDE.md
documents for mobile.css. Scoped to this modal; the repo-wide greying of
btn-primary on non-OG skins is pre-existing and left as a design call.

The empty-result copy now points at the steer note sitting right below
it ("Add a steer note and Rethink to try again"), zh-CN updated.

Verified with the steer E2E (still green) plus desktop, phone (390px),
and error-phase screenshots; static guards extended to pin the footer
convention and the accent re-assert.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/web/public/i18n.js

@@ -255,7 +255,8 @@
     'Read My Mind: predict your next prompt': '读心术：预测您的下一条提示',
     'Predict my next prompt': '预测我的下一条提示',
     'Reading your mind…': '正在读取您的想法…',
-    'No suggestion this time. Rethink to try again.': '这次没有建议。点击「重想」再试一次。',
+    'No suggestion this time. Add a steer note and Rethink to try again.':
+      '这次没有建议。可添加引导备注后点击「重想」再试一次。',
     Rethink: '重想',
     Insert: '插入',
     "Put the text on the session's composer without submitting it": '将文本放入会话输入框但不提交',

src/web/public/index.html

@@ -2894,7 +2894,7 @@
           <div class="readmymind-why" id="readMyMindWhy" data-i18n-skip></div>
           <div class="readmymind-alternates" id="readMyMindAlternates" data-i18n-skip style="display:none"></div>
         </div>
-        <div class="readmymind-error" style="display:none">No suggestion this time. Rethink to try again.</div>
+        <div class="readmymind-error" style="display:none">No suggestion this time. Add a steer note and Rethink to try again.</div>
         <!-- Rethink steer note: the user's own words about what they actually
              meant, sent as `steer` with the next Rethink. Shown whenever
              Rethink is live (ready AND empty-result phases), hidden while a
@@ -2903,11 +2903,14 @@
           <input type="text" id="readMyMindSteer" class="readmymind-steer-input" maxlength="2000" placeholder="Steer the rethink, e.g. 'no, I meant the mobile bug'" aria-label="Steer note for Rethink" onkeydown="if(event.key==='Enter')app.rethinkReadMyMind()">
         </div>
       </div>
+      <!-- btn-toolbar, not bare "btn btn-*": no .btn/.btn-secondary rule exists
+           in this codebase, so the bare classes render as unstyled UA buttons.
+           btn-toolbar is the convention every other modal footer uses. -->
       <div class="modal-footer">
-        <button class="btn btn-secondary" onclick="app.closeReadMyMind()">Dismiss</button>
-        <button class="btn btn-secondary" id="readMyMindRethink" onclick="app.rethinkReadMyMind()">Rethink</button>
-        <button class="btn btn-secondary" onclick="app.sendReadMyMind(false)" title="Put the text on the session's composer without submitting it">Insert</button>
-        <button class="btn btn-primary" onclick="app.sendReadMyMind(true)">Send</button>
+        <button class="btn-toolbar" onclick="app.closeReadMyMind()">Dismiss</button>
+        <button class="btn-toolbar" id="readMyMindRethink" onclick="app.rethinkReadMyMind()">Rethink</button>
+        <button class="btn-toolbar" onclick="app.sendReadMyMind(false)" title="Put the text on the session's composer without submitting it">Insert</button>
+        <button class="btn-toolbar btn-primary" onclick="app.sendReadMyMind(true)">Send</button>
       </div>
     </div>
   </div>

src/web/public/mobile.css

@@ -1336,15 +1336,14 @@ html.mobile-init .file-browser-panel {
     width: calc(100% - 2rem);
   }
   /* Four footer buttons on a narrow phone: let them wrap instead of clipping,
-     and give buttons + alternate rows finger-sized targets. */
+     and give buttons + alternate rows finger-sized targets. The flex row
+     itself comes from the base rule in styles.css. */
   .readmymind-modal .modal-footer {
-    display: flex;
     flex-wrap: wrap;
-    justify-content: flex-end;
-    gap: 0.5rem;
   }
-  .readmymind-modal .modal-footer .btn {
+  .readmymind-modal .modal-footer .btn-toolbar {
     flex: 1 1 auto;
+    justify-content: center;
     min-height: 38px;
   }
   .readmymind-alt {

src/web/public/styles.css

@@ -10927,6 +10927,32 @@ kbd {
 .readmymind-steer-input::placeholder {
   color: var(--text-dim);
 }
+/* Footer row: the buttons are btn-toolbar (display: flex, block-level), so
+   without this rule the four of them stack vertically. Mirrors the
+   runSummaryModal footer; the ≤430px block in mobile.css adds wrapping. */
+.readmymind-modal .modal-footer {
+  display: flex;
+  justify-content: flex-end;
+  gap: 0.5rem;
+  padding: 0.75rem 1rem;
+  border-top: 1px solid rgba(255, 255, 255, 0.06);
+}
+/* Send keeps the primary accent: the skin block's bare .btn-toolbar rule is
+   (0,2,1) under html:not([data-skin="og"]) and outranks the base
+   .btn-toolbar.btn-primary (0,2,0) — the specificity trap CLAUDE.md documents
+   for mobile.css — so the accent is re-asserted here at (0,4,0). Scoped to
+   this modal on purpose; un-greying every btn-primary on the new skins is a
+   design call, not this feature's. */
+.readmymind-modal .modal-footer .btn-toolbar.btn-primary {
+  background: var(--accent);
+  border-color: var(--accent);
+  color: #fff;
+}
+.readmymind-modal .modal-footer .btn-toolbar.btn-primary:hover {
+  background: var(--accent-hover);
+  border-color: var(--accent-hover);
+  color: #fff;
+}
 
 /* Keyboard-accessory 🧠 key: the phone surface for the same opt-in setting
    (the header 🧠 button stays phone-hidden in mobile.css). The key ships in