fix: hardening round from code review (4 P1 + 15 P2)

P1:
- settingsStore: back up an unparseable settings.json to .bak before
  falling back to defaults, so the next mutation can no longer silently
  wipe custom themes/highlight rules
- ptyDispatcher: fan out per-session data/exit handlers (Set instead of
  a single slot) so SSH split panes stop stealing each other's stream
- FilePanel: monotonic refresh token keeps stale listings from painting
  over a newer navigation; upload finish no longer yanks the panel back
- settings.css: active settings-tab label derives from --chrome-fg so it
  stays visible on the shipped light themes

P2 (main/renderer):
- paste guard: a paste ending in a newline always confirms
- Workspace: closing an SSH pane no longer seeds the local cwd with a
  remote path
- tray: skip close-dialog continuation on a destroyed window
- commands: close zombie 'in-progress' session logs at hydrate
- zmodem: clear the stale offer timer before arming a new one
- connectionsStore: coerce/validate renderer input before persisting
- sftp: OperationError marker class keeps translated errors out of the
  transport-retry classifier
- CommandsPanel: surface save failures inside the dialog
- ConnectionSidebar: drop a tautological tooltip condition

P2 (i18n/tooling/tests):
- localize the 16 ANSI color labels and the highlight sample text
  (21 new keys across zh-CN/zh-TW/en/ja)
- sync-changelog: keep ### subheadings, normalize CRLF notes
- release.cjs: GitHub release reuse-by-tag (idempotent re-runs); fail
  loudly on a failed Gitea asset listing
- commands-store test: absent historyEnabled now truly tests absence

src/shared/i18n/dicts/zh-CN/common.ts

@@ -4,6 +4,7 @@ const common: Record<string, string> = {
   'common.cancel': '取消',
   'common.close': '关闭',
   'common.save': '保存',
+  'common.saveFailed': '保存失败，请重试',
   'common.delete': '删除',
   'common.edit': '编辑',
   'common.add': '新增',

src/shared/i18n/dicts/zh-CN/settings.ts

@@ -16,6 +16,22 @@ const settings: Record<string, string> = {
   'settings.color.background': '背景',
   'settings.color.cursor': '光标',
   'settings.color.selection': '选区',
+  'settings.color.ansi.black': '黑',
+  'settings.color.ansi.red': '红',
+  'settings.color.ansi.green': '绿',
+  'settings.color.ansi.yellow': '黄',
+  'settings.color.ansi.blue': '蓝',
+  'settings.color.ansi.magenta': '品红',
+  'settings.color.ansi.cyan': '青',
+  'settings.color.ansi.white': '白',
+  'settings.color.ansi.brightBlack': '亮黑',
+  'settings.color.ansi.brightRed': '亮红',
+  'settings.color.ansi.brightGreen': '亮绿',
+  'settings.color.ansi.brightYellow': '亮黄',
+  'settings.color.ansi.brightBlue': '亮蓝',
+  'settings.color.ansi.brightMagenta': '亮品红',
+  'settings.color.ansi.brightCyan': '亮青',
+  'settings.color.ansi.brightWhite': '亮白',
   'settings.font.label': '字体',
   'settings.font.desc': '内置默认字体或系统等宽字体',
   'settings.font.placeholder': '选择字体',
@@ -153,6 +169,7 @@ const settings: Record<string, string> = {
   'settings.highlight.clearBg': '清空',
   'settings.highlight.addBg': '添加',
   'settings.highlight.palette': '色板',
+  'settings.highlight.sampleText': '高亮',
   'settings.highlight.note': '备注',
   'settings.highlight.notePlaceholder': '规则说明（可选）',
   'settings.highlight.caseInsensitive': '忽略大小写',