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/en/settings.ts

@@ -16,6 +16,22 @@ const settings: Record<string, string> = {
   'settings.color.background': 'Background',
   'settings.color.cursor': 'Cursor',
   'settings.color.selection': 'Selection',
+  'settings.color.ansi.black': 'Black',
+  'settings.color.ansi.red': 'Red',
+  'settings.color.ansi.green': 'Green',
+  'settings.color.ansi.yellow': 'Yellow',
+  'settings.color.ansi.blue': 'Blue',
+  'settings.color.ansi.magenta': 'Magenta',
+  'settings.color.ansi.cyan': 'Cyan',
+  'settings.color.ansi.white': 'White',
+  'settings.color.ansi.brightBlack': 'Bright Black',
+  'settings.color.ansi.brightRed': 'Bright Red',
+  'settings.color.ansi.brightGreen': 'Bright Green',
+  'settings.color.ansi.brightYellow': 'Bright Yellow',
+  'settings.color.ansi.brightBlue': 'Bright Blue',
+  'settings.color.ansi.brightMagenta': 'Bright Magenta',
+  'settings.color.ansi.brightCyan': 'Bright Cyan',
+  'settings.color.ansi.brightWhite': 'Bright White',
   'settings.font.label': 'Font',
   'settings.font.desc': 'The built-in default or a system monospace font',
   'settings.font.placeholder': 'Select a font',
@@ -162,6 +178,7 @@ const settings: Record<string, string> = {
   'settings.highlight.clearBg': 'Clear',
   'settings.highlight.addBg': 'Add',
   'settings.highlight.palette': 'Palette',
+  'settings.highlight.sampleText': 'Highlight',
   'settings.highlight.note': 'Note',
   'settings.highlight.notePlaceholder': 'Rule description (optional)',
   'settings.highlight.caseInsensitive': 'Ignore case',