Parse CSI erase field area actions

Author: SqlRush

docs/cc-100-roadmap.md

@@ -228,6 +228,8 @@ M7 补充：terminal CSI parser 现在识别带 intermediate space 的 `CSI Ps S
 
 M7 补充：terminal CSI parser 现在把 DEC selective erase `CSI ? Ps J` / `CSI ? Ps K` 标记为 selective display/line erase，和普通 ED/EL 区分开。
 
+M7 补充：terminal CSI parser 现在把 ECMA `CSI Ps N` / `CSI Ps O` 解析成 erase-in-field / erase-in-area action，覆盖 to-end/to-start/all 三种 region。
+
 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

@@ -293,6 +293,7 @@ test/parity/                 # golden tests against TS/official behavior
 - 本轮补充：terminal CSI parser 现在把带参数的 `CSI Pl;Pr s` 解析成 left/right horizontal margin region action，同时保留无参数 `CSI s` save-cursor 语义，和 DEC `?69h/l` margin mode 闭环。
 - 本轮补充：terminal CSI parser 现在识别带 intermediate space 的 `CSI Ps SP @` / `CSI Ps SP A` scroll-left/right 序列，避免误解析成 insert-characters 或 cursor-up。
 - 本轮补充：terminal CSI parser 现在把 DEC selective erase `CSI ? Ps J` / `CSI ? Ps K` 标记为 selective display/line erase，和普通 ED/EL 区分开。
+- 本轮补充：terminal CSI parser 现在把 ECMA `CSI Ps N` / `CSI Ps O` 解析成 erase-in-field / erase-in-area action，覆盖 to-end/to-start/all 三种 region。
 - 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

@@ -247,6 +247,7 @@ M7 progress now includes:
 - `internal/tui`: terminal CSI parsing now distinguishes parameterized `CSI Pl;Pr s` left/right horizontal margin regions from bare `CSI s` save-cursor semantics.
 - `internal/tui`: terminal CSI parsing now recognizes intermediate-space `CSI Ps SP @` / `CSI Ps SP A` scroll-left/right sequences instead of misclassifying them as insert-characters or cursor-up.
 - `internal/tui`: terminal CSI parsing now marks DEC selective erase `CSI ? Ps J` / `CSI ? Ps K` separately from ordinary ED/EL erase actions.
+- `internal/tui`: terminal CSI parsing now exposes ECMA `CSI Ps N` / `CSI Ps O` erase-in-field and erase-in-area actions with the same to-end/to-start/all regions used by other erase operations.
 - `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`: keybinding config and named-key script input now accept DOM-style arrow key aliases such as `arrowLeft`, `arrowRight`, `arrowUp`, `arrowDown`, and modifier-arrow variants.

internal/tui/terminal_csi.go

@@ -38,6 +38,8 @@ const (
 	CSICommandEraseLine        byte = 'K'
 	CSICommandInsertLines      byte = 'L'
 	CSICommandDeleteLines      byte = 'M'
+	CSICommandEraseField       byte = 'N'
+	CSICommandEraseArea        byte = 'O'
 	CSICommandDeleteCharacters byte = 'P'
 	CSICommandEraseCharacters  byte = 'X'
 	CSICommandBackwardTab      byte = 'Z'
@@ -167,6 +169,8 @@ type CSIEraseActionType string
 const (
 	CSIEraseActionDisplay CSIEraseActionType = "display"
 	CSIEraseActionLine    CSIEraseActionType = "line"
+	CSIEraseActionField   CSIEraseActionType = "field"
+	CSIEraseActionArea    CSIEraseActionType = "area"
 	CSIEraseActionChars   CSIEraseActionType = "chars"
 )
 
@@ -412,6 +416,10 @@ func ParseCSISequence(sequence string) (CSIAction, bool) {
 		return CSIAction{Type: CSIActionErase, Erase: CSIEraseAction{Type: CSIEraseActionDisplay, Region: csiEraseDisplayRegion(csiParamDefault(params, 0, 0)), Selective: privateMode == '?'}}, true
 	case CSICommandEraseLine:
 		return CSIAction{Type: CSIActionErase, Erase: CSIEraseAction{Type: CSIEraseActionLine, Region: csiEraseLineRegion(csiParamDefault(params, 0, 0)), Selective: privateMode == '?'}}, true
+	case CSICommandEraseField:
+		return CSIAction{Type: CSIActionErase, Erase: CSIEraseAction{Type: CSIEraseActionField, Region: csiEraseLineRegion(csiParamDefault(params, 0, 0))}}, true
+	case CSICommandEraseArea:
+		return CSIAction{Type: CSIActionErase, Erase: CSIEraseAction{Type: CSIEraseActionArea, Region: csiEraseLineRegion(csiParamDefault(params, 0, 0))}}, true
 	case CSICommandEraseCharacters:
 		return CSIAction{Type: CSIActionErase, Erase: CSIEraseAction{Type: CSIEraseActionChars, Count: p0}}, true
 	case CSICommandInsertCharacters:

internal/tui/tui_test.go

@@ -3759,6 +3759,8 @@ func TestParseCSISequenceActions(t *testing.T) {
 		{seq: CSISequence("K"), want: CSIEraseAction{Type: CSIEraseActionLine, Region: CSIEraseToEnd}},
 		{seq: CSISequence("?K"), want: CSIEraseAction{Type: CSIEraseActionLine, Region: CSIEraseToEnd, Selective: true}},
 		{seq: CSISequence(2, "K"), want: CSIEraseAction{Type: CSIEraseActionLine, Region: CSIEraseAll}},
+		{seq: CSISequence("N"), want: CSIEraseAction{Type: CSIEraseActionField, Region: CSIEraseToEnd}},
+		{seq: CSISequence(1, "O"), want: CSIEraseAction{Type: CSIEraseActionArea, Region: CSIEraseToStart}},
 		{seq: CSISequence(6, "X"), want: CSIEraseAction{Type: CSIEraseActionChars, Count: 6}},
 	}
 	for _, tc := range eraseCases {
@@ -3930,6 +3932,11 @@ func TestParseCSISequenceActions(t *testing.T) {
 		t.Fatalf("terminal parser selective erase actions = %#v", actions)
 	}
 
+	actions = parser.Feed(CSISequence(2, "O"))
+	if len(actions) != 1 || actions[0].Type != TerminalActionErase || actions[0].Erase.Type != CSIEraseActionArea || actions[0].Erase.Region != CSIEraseAll {
+		t.Fatalf("terminal parser area erase actions = %#v", actions)
+	}
+
 	actions = parser.Feed(CSISequence(5, 40, "s"))
 	if len(actions) != 1 || actions[0].Type != TerminalActionScroll || actions[0].Scroll.Type != CSIScrollActionSetHorizontalRegion || actions[0].Scroll.Left != 5 || actions[0].Scroll.Right != 40 {
 		t.Fatalf("terminal parser horizontal region actions = %#v", actions)