feat(ui): 优化购卡键盘渲染逻辑与单程区间选中样式

- 重构 showCardNameInput 渲染逻辑，添加 renderInput 局部更新，解决按键闪烁问题
- 优化单程区间的选中样式，移除文本前缀，改为绿色背景高亮，与购票界面保持一致
- 更新版本号至 v1.5.30

ticketmachine.lua

@@ -1,6 +1,6 @@
 local CURRENT_STATION_CODE = 'Ticket-Machine'
 local API_BASE = 'https://ticket.fse-media.group/api'
-local VERSION = 'v1.5.29'
+local VERSION = 'v1.5.30'
 local UPDATE_CHECK_INTERVAL = 5
 
 -- ###########################
@@ -1435,10 +1435,11 @@ local function showSingleSegmentSelection()
       local lineColor = nearestCCColor(seg.color)
       local textColor = contrastTextColor(lineColor)
       local isSelected = (state.singleSegment == seg)
+      local bg = isSelected and colors.green or lineColor
+      local fg = isSelected and colors.white or textColor
       local label = seg.lineName .. ' ' .. tostring(seg.cost) .. 'c'
-      if isSelected then label = '>' .. label end
       if #label > bw then label = label:sub(1, bw) end
-      addButton(x, y, label, bw, 3, {lineColor, textColor}, function()
+      addButton(x, y, label, bw, 3, {bg, fg}, function()
         state.singleSegment = seg
       end)
     end
@@ -1579,6 +1580,25 @@ local function showCardNameInput()
     {'+'}
   }
 
+  local function clearLine(y)
+    termDev.setBackgroundColor(colors.black)
+    termDev.setCursorPos(1, y)
+    termDev.write(string.rep(' ', w))
+  end
+
+  local function renderInput()
+    local placeholder = name
+    if #placeholder == 0 then
+      placeholder = 'ENTER NAME'
+    elseif #placeholder > (w - 8) then
+      placeholder = '...' .. placeholder:sub(-(w - 11))
+    end
+    clearLine(4)
+    clearLine(5)
+    centerText(4, '[' .. placeholder .. ']', colors.yellow)
+    if msg and #msg > 0 then centerText(5, msg, msgCol) end
+  end
+
   local function isAllowedHolderChar(ch)
     if type(ch) ~= 'string' or #ch ~= 1 then return false end
     if ch:match('[A-Za-z ]') then return true end
@@ -1590,19 +1610,14 @@ local function showCardNameInput()
     if ch:match('[A-Za-z]') then ch = ch:upper() end
     if ch == ' ' and (#name == 0 or name:sub(-1) == ' ') then return end
     name = name .. ch
+    msg = ''
+    renderInput()
   end
 
   while state.page == 'card_name' do
-    local placeholder = name
-    if #placeholder == 0 then
-      placeholder = 'ENTER NAME'
-    elseif #placeholder > (w - 8) then
-      placeholder = '...' .. placeholder:sub(-(w - 11))
-    end
     local rows = (keyboardMode == 'symbol') and symbolRows or alphaRows
     drawHeader('Enter Holder Name', (keyboardMode == 'symbol') and 'Symbol keyboard' or 'Letters / symbols / space')
-    centerText(4, '[' .. placeholder .. ']', colors.yellow)
-    if msg and #msg > 0 then centerText(5, msg, msgCol) end
+    renderInput()
     Buttons = {}
     local keyW, keyH = (w < 44 and 2 or 3), 2
     local sY = 7
@@ -1621,20 +1636,34 @@ local function showCardNameInput()
       appendHolderChar(' ')
     end)
     addButton(2, h-3, '<-back', 8, 3, {colors.black, colors.red}, function() state.page = 'card_home' end)
+    
+    local currentKeyboardMode = keyboardMode
     addButton(12, h-3, (keyboardMode == 'symbol') and 'ABC' or 'SYM', 8, 3, {colors.black, colors.orange}, function()
       keyboardMode = (keyboardMode == 'symbol') and 'alpha' or 'symbol'
     end)
-    addButton(w-31, h-3, 'BKSP', 8, 3, {colors.black, colors.red}, function() name = name:sub(1, -2) end)
-    addButton(w-21, h-3, 'CLEAR', 8, 3, {colors.black, colors.red}, function() name = '' end)
+    
+    addButton(w-31, h-3, 'BKSP', 8, 3, {colors.black, colors.red}, function() 
+      name = name:sub(1, -2) 
+      msg = ''
+      renderInput()
+    end)
+    addButton(w-21, h-3, 'CLEAR', 8, 3, {colors.black, colors.red}, function() 
+      name = '' 
+      msg = ''
+      renderInput()
+    end)
     addButton(w-11, h-3, 'NEXT->', 10, 3, {colors.black, colors.green}, function()
       local clean = firstString(name)
       if #clean < 2 then
         msg, msgCol = 'Name too short', colors.red
+        renderInput()
         return
       end
       state.holderName = clean
       state.page = 'card_topup'
     end)
+
+    while state.page == 'card_name' and keyboardMode == currentKeyboardMode do
       local ev, p1, p2, p3 = os.pullEvent()
       if ev == 'mouse_click' or ev == 'monitor_touch' then
         for _, b in ipairs(Buttons) do
@@ -1644,6 +1673,8 @@ local function showCardNameInput()
         appendHolderChar(tostring(p1 or ''))
       elseif ev == 'key' and p1 == keys.backspace then
         name = name:sub(1, -2)
+        msg = ''
+        renderInput()
       elseif ev == 'key' and (p1 == keys.enter or p1 == keys.numPadEnter) then
         local clean = firstString(name)
         if #clean >= 2 then
@@ -1651,6 +1682,8 @@ local function showCardNameInput()
           state.page = 'card_topup'
         else
           msg, msgCol = 'Name too short', colors.red
+          renderInput()
+        end
       end
     end
   end