fix(tui): per-file polish round 8 — prompt part/frecency

expandPastedTextPlaceholders passed user-pasted text as the replacement
string to String.replace, so pasted content containing $&, $', $$ or $n
was interpreted as substitution patterns and corrupted on the
open-editor and copy paths; switch to a function replacer and add a
regression test. Frecency pruning called setStore with a plain object,
which Solid merges rather than replaces, so pruned paths were never
removed (unbounded in-memory growth past the cap); reconcile instead.

Author: edy

MERGE.md

@@ -203,6 +203,7 @@ fork 与上游改了同一处（常见于 TUI 视觉/UX、core 加固逻辑）
 | 逐文件打磨轮5：`routes/session/{index,dialog-message}.tsx` | 中 | 保留 bug 修复：TextPart `tableOptions` 由 setup 期字面量改 `createMemo`（原 `theme.border` 快照在主题切换后冻结表格边框色）；`index.tsx` revert 分支与 `dialog-message.tsx` revert/copy/fork 四处 `sync.data.part[id].reduce` 补 `?? []`（消息 part 未加载时 `.reduce` 抛错）；moveChild 方向语义（`- direction`）疑似与命令名相反但属上游行为，择要跳过（上游若已做可取上游版本） |
 | 逐文件打磨轮6：`feature-plugins/system/diff-viewer-ui.tsx`（`routes/session/{dialog-timeline,permission,dialog-fork-from-timeline,subagent-footer,question}.tsx`+`routes/home*.tsx`+`feature-plugins/{system/*,home/*}` 已审计） | 中 | 保留 bug 修复：`Panel` `borderProps.borderColor` 由 setup 期快照改 getter（`theme.border` 随对象展开保持响应式，原主题切换后 diff 查看器面板边框色冻结，`Separator` 已用 `() =>` 正确）；fork `.data!.id` 无守卫（与 `dialog-message.tsx` fork 同款上游模式）择要跳过；`diff-viewer-file-tree-utils.moveFileTreeSelectionToFile` 仅测试引用但恐留待键位，暂不删（上游若已做可取上游版本） |
 | 逐文件打磨轮7：`component/dialog-model.tsx`（`dialog-{agent,move-session,theme-list,variant,session-delete-failed,session-list,skill,stash,workspace-file-changes,workspace-list}.tsx`+`command-palette.tsx` 已审计） | 中 | 保留 bug 修复：收藏/最近模型选项由可选的 `model.id` 改用可靠的映射键 `item.modelID`（`id?: string` 缺省时 `model.id.includes("-nano")` 抛错、选中项 modelID 变 undefined；并与 providerOptions 分支用键一致）；`dialog-theme-list` `theme.all()` setup 期快照（需订阅 `subscribeThemes` 才能修，`all()` 非响应式且启动后基本不变）择要跳过（上游若已做可取上游版本） |
+| 逐文件打磨轮8：`prompt/{part.ts,frecency.tsx}` + `test/prompt/part.test.ts`（`prompt/{display,history,stash,traits}` + `component/prompt/{history,frecency,stash}` 再导出壳已审计） | 中 | 保留 bug 修复：`expandPastedTextPlaceholders` 的 `String.replace(needle, part.text)` 改函数替换 `() => part.text`（粘贴含 `$&`/`$'`/`$$`/`$n` 的文本经 open-editor/copy 路径被当替换模式解释而损坏，补回归测试）；`frecency` 剪枝 `setStore("data", obj)` 改 `reconcile(obj)`（Solid store 合并语义使被剪路径永不删除，会话内 map 无限增长、每次 update 全量重写 jsonl）（上游若已做可取上游版本） |
 
 ### 其他
 

packages/tui/src/prompt/frecency.tsx

@@ -1,6 +1,6 @@
 import path from "path"
 import { onMount } from "solid-js"
-import { createStore } from "solid-js/store"
+import { createStore, reconcile } from "solid-js/store"
 import { createSimpleContext } from "../context/helper"
 import { useTuiPaths } from "../context/runtime"
 import { appendText, readText, writeText } from "../util/persistence"
@@ -64,7 +64,7 @@ export const { use: useFrecency, provider: FrecencyProvider } = createSimpleCont
       const sorted = Object.entries(store.data)
         .sort(([, a], [, b]) => b.lastOpen - a.lastOpen)
         .slice(0, MAX_FRECENCY_ENTRIES)
-      setStore("data", Object.fromEntries(sorted))
+      setStore("data", reconcile(Object.fromEntries(sorted)))
       writeText(
         frecencyPath,
         sorted.map(([entryPath, entry]) => JSON.stringify({ path: entryPath, ...entry })).join("\n") + "\n",

packages/tui/src/prompt/part.ts

@@ -8,7 +8,7 @@ export function stripPromptPartIDs<Part extends { id: string; messageID: string;
 export function expandPastedTextPlaceholders(text: string, parts: readonly unknown[]) {
   return parts.reduce<string>((result, part) => {
     if (!isPastedTextPart(part)) return result
-    return result.replace(part.source.text.value, part.text)
+    return result.replace(part.source.text.value, () => part.text)
   }, text)
 }
 

packages/tui/test/prompt/part.test.ts

@@ -1,5 +1,5 @@
 import { describe, expect, test } from "bun:test"
-import { expandTrackedPastedText, stripPromptPartIDs } from "../../src/prompt/part"
+import { expandPastedTextPlaceholders, expandTrackedPastedText, stripPromptPartIDs } from "../../src/prompt/part"
 
 describe("prompt part", () => {
   test("strips persisted IDs from reused parts", () => {
@@ -50,4 +50,19 @@ describe("prompt part", () => {
       ]),
     ).toBe(`keep ${marker} then alpha\nbeta\ngamma tail`)
   })
+
+  test("inserts pasted text with $ patterns literally", () => {
+    const marker = "[Pasted ~2 lines]"
+    const pasted = "sed 's/a/$&/' && echo $'x' cost $$5"
+
+    expect(
+      expandPastedTextPlaceholders(`before ${marker} after`, [
+        {
+          type: "text",
+          text: pasted,
+          source: { text: { value: marker } },
+        },
+      ]),
+    ).toBe(`before ${pasted} after`)
+  })
 })