Update helpdoc viewer UI and improve text handling

- Add title localization for helpdoc viewer
- Implement ANSI-aware string truncation for proper display
- Improve focus indication with color highlighting
- Move display_width utility to shared module
- Update welcome and command helpdoc formatting
- Bump copyright year to 2026

10 files changed, 4 insertions, 14 deletions

diff --git a/resources/helpdoc/Welcome_To_JVCS.en.md b/resources/helpdoc/Welcome_To_JVCS.en.md
index f82f58e..8161371 100644
--- a/resources/helpdoc/Welcome_To_JVCS.en.md
+++ b/resources/helpdoc/Welcome_To_JVCS.en.md
@@ -1 +1 @@
-# Welcome
+> Welcome to the `JustEnoughVCS` CLI program!
diff --git a/resources/helpdoc/Welcome_To_JVCS.zh-CN.md b/resources/helpdoc/Welcome_To_JVCS.zh-CN.md
index 2dfd3ee..a67c5b0 100644
--- a/resources/helpdoc/Welcome_To_JVCS.zh-CN.md
+++ b/resources/helpdoc/Welcome_To_JVCS.zh-CN.md
@@ -1 +1 @@
-# 你好
+> 欢迎使用 `JustEnoughVCS` 命令行程序！
diff --git a/resources/helpdoc/commands/hexdump.en.md b/resources/helpdoc/commands/hexdump.en.md
index 60d5275..4d30df1 100644
--- a/resources/helpdoc/commands/hexdump.en.md
+++ b/resources/helpdoc/commands/hexdump.en.md
@@ -1,5 +1,3 @@
-# Hexdump
-
 > Print binary information
 
 ## Usage
diff --git a/resources/helpdoc/commands/hexdump.zh-CN.md b/resources/helpdoc/commands/hexdump.zh-CN.md
index 9b5b8ad..cbc743f 100644
--- a/resources/helpdoc/commands/hexdump.zh-CN.md
+++ b/resources/helpdoc/commands/hexdump.zh-CN.md
@@ -1,5 +1,3 @@
-# Hexdump
-
 > 打印二进制信息
 
 ## 使用
diff --git a/resources/helpdoc/commands/sheetdump.en.md b/resources/helpdoc/commands/sheetdump.en.md
index 1616f12..63be56b 100644
--- a/resources/helpdoc/commands/sheetdump.en.md
+++ b/resources/helpdoc/commands/sheetdump.en.md
@@ -1,5 +1,3 @@
-# Sheetdump
-
 > Visually output the internal structure of a `Sheet`
 
 ## Usage
diff --git a/resources/helpdoc/commands/sheetdump.zh-CN.md b/resources/helpdoc/commands/sheetdump.zh-CN.md
index 0ae46ef..e1a827f 100644
--- a/resources/helpdoc/commands/sheetdump.zh-CN.md
+++ b/resources/helpdoc/commands/sheetdump.zh-CN.md
@@ -1,5 +1,3 @@
-# Sheetdump
-
 > 可视化地输出 `Sheet` 的内部结构
 
 ## 使用
diff --git a/resources/helpdoc/commands/sheetedit.en.md b/resources/helpdoc/commands/sheetedit.en.md
index 80f2a7b..2a161dd 100644
--- a/resources/helpdoc/commands/sheetedit.en.md
+++ b/resources/helpdoc/commands/sheetedit.en.md
@@ -1,5 +1,3 @@
-# Sheetedit
-
 > Edit `Sheet` files using your system editor
 
 ## Usage
diff --git a/resources/helpdoc/commands/sheetedit.zh-CN.md b/resources/helpdoc/commands/sheetedit.zh-CN.md
index f30825a..b94ee34 100644
--- a/resources/helpdoc/commands/sheetedit.zh-CN.md
+++ b/resources/helpdoc/commands/sheetedit.zh-CN.md
@@ -1,5 +1,3 @@
-# Sheetedit
-
 > 使用系统编辑器修改 `Sheet` 文件
 
 ## 使用
diff --git a/resources/locales/jvn/helpdoc_viewer/en.yml b/resources/locales/jvn/helpdoc_viewer/en.yml
index 1f5d9d4..78acae4 100644
--- a/resources/locales/jvn/helpdoc_viewer/en.yml
+++ b/resources/locales/jvn/helpdoc_viewer/en.yml
@@ -1,4 +1,5 @@
 helpdoc_viewer:
+  title: JustEnoughVCS Help Documents
   tree_area_hint: |
       _List_ | ↑↓: Page | ←→/Space: Switch view | Q: Quit
   content_area_hint: |
diff --git a/resources/locales/jvn/helpdoc_viewer/zh-CN.yml b/resources/locales/jvn/helpdoc_viewer/zh-CN.yml
index 65825d5..1c169c9 100644
--- a/resources/locales/jvn/helpdoc_viewer/zh-CN.yml
+++ b/resources/locales/jvn/helpdoc_viewer/zh-CN.yml
@@ -1,4 +1,5 @@
 helpdoc_viewer:
+  title: JustEnoughVCS 帮助文档
   tree_area_hint: |
       _列表_ | ↑↓: 翻页 | ←→/Space: 切换视图 | Q: 退出
   content_area_hint: |