fix(packui): M113 收口 —— 导出的「Save to」字段形状与「没进包」标题承诺

复审看图挑出的两处，只改这两处，其余不动。

1. **Save to 字段**：原来是 `label("Save to (empty = suggested)")` + 空值，看起来像「这句提示就是字段值」，
   与上面 Pack name / Version 的「标签在上、值在下」不一致。改成短标签 `Save to` + 占位
   `empty = suggested path`（新增 `PackExportOutputPlaceholder` 一个键）。

2. **`Not in the pack (listed one by one)` 与 `...and 6 more files` 自相矛盾**：13 条没进包的其实全列了，
   但紧随其后的「还有 6 个」说的是**内联样例**的截断，两句挨着会被读成一件事。
   改法：「没进包」标题带真实计数（`Not in the pack: {count}`），内联样例加自己的标题
   `Copied into overrides/ (first {shown}):`，截断那句改成 `…and {count} more files (not shown here)`
   —— 谁被截断、截了几条，写在它自己的那一块里。

`tolerable_title` 因此改成收 `String`（计数是运行时 format 出来的），`golden.rs` 同步三个键。

门禁：`cargo fmt --all --check` 通过；`cargo test -p unlucky-app-iced --lib -j 2`
504 passed / 0 failed（TEST_EXIT=0）；`cargo check -p unlucky-app-iced --all-targets` 零 warning。
出图：`04-export-light.png` / `04-export-dark.png` 已重出（其余 8 张未受影响、未改动）。

crates/i18n/src/catalog/content.rs

@@ -173,7 +173,11 @@ macro_rules! content_entries {
             PackExportFormat => ("Format", "格式"),
             PackExportName => ("Pack name", "包名"),
             PackExportVersion => ("Version", "版本"),
-            PackExportOutput => ("Save to (empty = suggested)", "保存到（留空 = 自动）"),
+            PackExportOutput => ("Save to", "保存到"),
+            PackExportOutputPlaceholder => (
+                "empty = suggested path",
+                "留空 = 自动给一个路径"
+            ),
             PackExportPrecheck => ("Dry run", "预检"),
             PackExportConfirm => ("Write the pack", "确认写盘"),
             PackExportAbort => ("Back", "返回"),
@@ -196,13 +200,20 @@ macro_rules! content_entries {
                 "{bytes} copied into overrides/",
                 "{bytes} 会原样拷进 overrides/"
             ),
+            PackPreviewInlineTitle => (
+                "Copied into overrides/ (first {shown}):",
+                "原样拷进 overrides/（只列前 {shown} 个）："
+            ),
             PackPreviewSkippedTitle => (
-                "Not in the pack (listed one by one)",
-                "没进包（逐条列出）"
+                "Not in the pack: {count}",
+                "没进包：{count} 项"
             ),
             PackPreviewNotes => ("Known losses", "已知损失"),
             PackPreviewTarget => ("Will be written to {path}", "将写到 {path}"),
-            PackPreviewMore => ("…and {count} more files", "…还有 {count} 个文件"),
+            PackPreviewMore => (
+                "…and {count} more files (not shown here)",
+                "…还有 {count} 个文件（这里不展开）"
+            ),
             PackPreviewComplete => ("Nothing is left out", "没有遗漏任何文件"),
             PackPreviewIncomplete => (
                 "Some files will not be in the pack",

crates/i18n/src/catalog/golden.rs

@@ -272,7 +272,8 @@ pub(super) const GOLDEN: &[(&str, &str, &str)] = &[
     ("PackExportFormat", "Format", "格式"),
     ("PackExportName", "Pack name", "包名"),
     ("PackExportVersion", "Version", "版本"),
-    ("PackExportOutput", "Save to (empty = suggested)", "保存到（留空 = 自动）"),
+    ("PackExportOutput", "Save to", "保存到"),
+    ("PackExportOutputPlaceholder", "empty = suggested path", "留空 = 自动给一个路径"),
     ("PackExportPrecheck", "Dry run", "预检"),
     ("PackExportConfirm", "Write the pack", "确认写盘"),
     ("PackExportAbort", "Back", "返回"),
@@ -283,10 +284,11 @@ pub(super) const GOLDEN: &[(&str, &str, &str)] = &[
     ("PackPreviewHead", "Will inline {inline} files · cannot export: {skipped}", "将内联 {inline} 个文件 · 无法导出 {skipped} 项"),
     ("PackPreviewRemote", "{count} files can be referenced remotely", "{count} 个文件可走远程引用"),
     ("PackPreviewInlineBytes", "{bytes} copied into overrides/", "{bytes} 会原样拷进 overrides/"),
-    ("PackPreviewSkippedTitle", "Not in the pack (listed one by one)", "没进包（逐条列出）"),
+    ("PackPreviewInlineTitle", "Copied into overrides/ (first {shown}):", "原样拷进 overrides/（只列前 {shown} 个）："),
+    ("PackPreviewSkippedTitle", "Not in the pack: {count}", "没进包：{count} 项"),
     ("PackPreviewNotes", "Known losses", "已知损失"),
     ("PackPreviewTarget", "Will be written to {path}", "将写到 {path}"),
-    ("PackPreviewMore", "…and {count} more files", "…还有 {count} 个文件"),
+    ("PackPreviewMore", "…and {count} more files (not shown here)", "…还有 {count} 个文件（这里不展开）"),
     ("PackPreviewComplete", "Nothing is left out", "没有遗漏任何文件"),
     ("PackPreviewIncomplete", "Some files will not be in the pack", "有文件不会进包"),
     ("PackReasonModrinthSha1", "Modrinth match (SHA-1)", "Modrinth 命中（SHA-1）"),