fix(dashboard): clarify Kanban Ready vs assignment

Ready column help and fallbacks now describe dependency-ready work; show a
badge on unassigned ready cards and fix the stale unassigned tooltip. Align
localized Ready help strings with the new semantics.

Co-authored-by: Cursor <cursoragent@cursor.com>

web/src/i18n/zh-hant.ts

@@ -663,7 +663,7 @@ export const zhHant: Translations = {
     columnHelp: {
       triage: "原始想法 — 規格制定者將完善規格",
       todo: "等待相依項目或尚未指派",
-      ready: "已指派，等待排程器輪詢",
+      ready: "相依項目已滿足；指派設定檔以便排程",
       running: "已被工作者領取 — 執行中",
       blocked: "工作者請求人工輸入",
       done: "已完成",