Parse DEC backarrow key mode

Author: SqlRush

docs/cc-100-roadmap.md

@@ -172,6 +172,8 @@ M7 补充：terminal CSI parser 现在把 xterm/DEC `?45h/l` reverse-wraparound
 
 M7 补充：terminal CSI parser 现在把 DEC `?66h/l` application keypad mode 解析成结构化 `applicationKeypad` mode action，补齐 application cursor mode 相邻的输入状态序列。
 
+M7 补充：terminal CSI parser 现在把 DEC `?67h/l` backarrow key mode 解析成结构化 `backarrowKey` mode action，补齐键盘输入状态序列。
+
 M7 补充：terminal CSI parser 现在把 REP repeat-preceding-character (`CSI b`/`CSI 4b`) 解析成 edit action，visible-text/snapshot pipeline 和 ANSI message wrapping/trim 会按重复次数展开前一个可重复 grapheme。
 
 M7 补充：terminal CSI parser 现在按 ANSI 默认参数解析 scroll-region (`CSI r`/`CSI ;10r`)，缺失 top 默认为 1，缺失 bottom 保持为 0 表示 reset/full-height，避免把 reset 误判为单行区域。

docs/claude-code-go-rewrite-plan.md

@@ -269,6 +269,7 @@ test/parity/                 # golden tests against TS/official behavior
 - 本轮补充：terminal CSI parser 把 DEC `?12h/l` cursor blink mode 解析成结构化 `cursorBlink` mode action，补齐 cursor visibility/style 相邻的终端状态序列。
 - 本轮补充：terminal CSI parser 把 xterm/DEC `?45h/l` reverse-wraparound mode 解析成结构化 `reverseWrap` mode action，补齐 auto-wrap 相邻的 wrap 状态序列。
 - 本轮补充：terminal CSI parser 把 DEC `?66h/l` application keypad mode 解析成结构化 `applicationKeypad` mode action，补齐 application cursor mode 相邻的输入状态序列。
+- 本轮补充：terminal CSI parser 把 DEC `?67h/l` backarrow key mode 解析成结构化 `backarrowKey` mode action，补齐键盘输入状态序列。
 - 本轮补充：terminal CSI parser 把 REP repeat-preceding-character (`CSI b`) 归入 edit action，visible-text/snapshot pipeline 和 ANSI message wrapping/trim 会按重复次数展开前一个可重复 grapheme。
 - 本轮补充：terminal CSI parser 按 ANSI 默认参数解析 scroll-region (`CSI r`/`CSI ;10r`)，缺失 top 默认为 1，缺失 bottom 保持 0 表示 reset/full-height，避免 reset scroll region 被误判为单行区域。
 - 本轮补充：terminal CSI parser 把 DECSTR soft reset (`CSI !p`) 归入 reset action，并在 terminal parser 中清理 SGR/link 状态。

docs/first-second-parity-audit.md

@@ -220,6 +220,7 @@ M7 progress now includes:
 - `internal/tui`: terminal CSI parser now recognizes DEC cursor blink mode (`?12h/l`) as a structured `cursorBlink` mode action.
 - `internal/tui`: terminal CSI parser now recognizes xterm/DEC reverse-wraparound mode (`?45h/l`) as a structured `reverseWrap` mode action.
 - `internal/tui`: terminal CSI parser now recognizes DEC application keypad mode (`?66h/l`) as a structured `applicationKeypad` mode action.
+- `internal/tui`: terminal CSI parser now recognizes DEC backarrow key mode (`?67h/l`) as a structured `backarrowKey` mode action.
 - `internal/tui`: keybinding config, keymap resolution, and interaction script named-key input now accept terminal aliases for `ctrl-h`/`ctrl-i`/`ctrl-j`/`ctrl-m`, `ctrl-[`, and `ctrl-?`, including `control-*` and compact/camel variants.
 - `internal/tui`: keybinding config now accepts page navigation aliases such as `pgup`, `pg-up`, `prior`, `pgdn`, `pg-down`, and `next`.
 - `internal/tui`: terminal key parsing now accepts CSI-u/kitty keyboard protocol sequences for existing ctrl/alt editing keys, shift-enter, shift-tab, and printable shift-only runes.

internal/tui/terminal_csi.go

@@ -78,6 +78,7 @@ const (
 	DECModeAltScreen          = 47
 	DECModeReverseWrap        = 45
 	DECModeApplicationKeypad  = 66
+	DECModeBackarrowKey       = 67
 	DECModeAltScreenBuffer    = 1047
 	DECModeSaveRestoreCursor  = 1048
 	DECModeAltScreenClear     = 1049
@@ -241,6 +242,7 @@ const (
 	CSIModeActionReverseWrap       CSIModeActionType = "reverseWrap"
 	CSIModeActionCursorBlink       CSIModeActionType = "cursorBlink"
 	CSIModeActionApplicationKeypad CSIModeActionType = "applicationKeypad"
+	CSIModeActionBackarrowKey      CSIModeActionType = "backarrowKey"
 	CSIModeActionMouseTracking     CSIModeActionType = "mouseTracking"
 	CSIModeActionFocusEvents       CSIModeActionType = "focusEvents"
 	CSIModeActionAlternateScroll   CSIModeActionType = "alternateScroll"
@@ -601,6 +603,8 @@ func csiPrivateModeAction(mode int, enabled bool) (CSIAction, bool) {
 		return CSIAction{Type: CSIActionMode, Mode: CSIModeAction{Type: CSIModeActionAlternateScreen, Enabled: enabled}}, true
 	case DECModeApplicationKeypad:
 		return CSIAction{Type: CSIActionMode, Mode: CSIModeAction{Type: CSIModeActionApplicationKeypad, Enabled: enabled}}, true
+	case DECModeBackarrowKey:
+		return CSIAction{Type: CSIActionMode, Mode: CSIModeAction{Type: CSIModeActionBackarrowKey, Enabled: enabled}}, true
 	case DECModeSaveRestoreCursor:
 		cursorType := CSICursorActionRestore
 		if enabled {

internal/tui/tui_test.go

@@ -3664,6 +3664,8 @@ func TestParseCSISequenceActions(t *testing.T) {
 		{seq: "\x1b[?45l", want: CSIModeAction{Type: CSIModeActionReverseWrap, Enabled: false}},
 		{seq: "\x1b[?66h", want: CSIModeAction{Type: CSIModeActionApplicationKeypad, Enabled: true}},
 		{seq: "\x1b[?66l", want: CSIModeAction{Type: CSIModeActionApplicationKeypad, Enabled: false}},
+		{seq: "\x1b[?67h", want: CSIModeAction{Type: CSIModeActionBackarrowKey, Enabled: true}},
+		{seq: "\x1b[?67l", want: CSIModeAction{Type: CSIModeActionBackarrowKey, Enabled: false}},
 		{seq: EnterAlternateScreen, want: CSIModeAction{Type: CSIModeActionAlternateScreen, Enabled: true}},
 		{seq: "\x1b[?47l", want: CSIModeAction{Type: CSIModeActionAlternateScreen, Enabled: false}},
 		{seq: "\x1b[?1047h", want: CSIModeAction{Type: CSIModeActionAlternateScreen, Enabled: true}},