Align AXIS control flow and fix pause and program rendering

Document source UI gates, explicit native live-plot clearing, and remaining parity boundaries. Fix pause/resume transport continuity, repeated stepping, coordinate previews, and spindle override state. Optimize large program snapshots and rendering, and cover the control flows with native Tcl, WASM, and browser checks.

Validation: 22 native tests and source/browser checks pass. Worker/App regression: 113 of 123 pass; 10 pre-existing failures remain documented with no new failures.

docs/linuxcnc-axis-web-control-panel-source-logic.dot

@@ -47,10 +47,10 @@ digraph LinuxCncAxisWebControlLogic {
     contract [label="源程序锁定契约\nSOURCE_EXACT · SOURCE_ADAPTER\nSOURCE_BLOCKED · WEB_EXTENSION", fillcolor="#fff5c9", color="#b08a2e", penwidth=2.2];
     gesture [label="浏览器控件手势\ndata-axis-control\n82 个文档控制 ID", fillcolor="#edf6f8", color="#3c8091"];
     react [label="React handler\n只发意图，不是状态权威", fillcolor="#edf6f8", color="#3c8091"];
-    operation [label="AxisOperationController\n串行操作 · operation_id · ledger", fillcolor="#eef2fb", color="#526da8"];
+    operation [label="AxisOperationController\noperation_id · ledger\nWeb 通道暂停仍接收合法连续 seq", fillcolor="#eef2fb", color="#526da8"];
     gate [label="SimSession command gate\n最终门控与稳定拒绝原因", fillcolor="#fcebdc", color="#bd6a28", penwidth=2.2];
     wasm [label="LinuxCNC/WASM 权威\nTask · Interpreter · TP\nIO · Home/Limit · Kinematics", fillcolor="#e9f5e8", color="#43844b", penwidth=2.2];
-    snapshot [label="Canonical snapshot\naxis_state · gates · motion\nprogram · devices · visual", fillcolor="#e9f5e8", color="#43844b"];
+    snapshot [label="Canonical snapshot\naxis_state · ui_gates / gates · motion\nprogram · devices · visual", fillcolor="#e9f5e8", color="#43844b"];
     projection [label="React projection\n按钮 enabled/pressed\nDRO · Preview · Diagnostics", fillcolor="#edf6f8", color="#3c8091"];
 
     { rank=same; source; contract; gesture; react; operation; }
@@ -98,7 +98,7 @@ digraph LinuxCncAxisWebControlLogic {
     on_unhomed [label="ON · NOT HOMED\nOpen / Home / joint-mode manual\nAUTO/MDI 由 task homing 策略拒绝", fillcolor="#fff5c9", color="#b08a2e"];
     idle [label="ON · HOMED · IDLE\nRun / Step / Manual / MDI\n按各自源门控启用", fillcolor="#e9f5e8", color="#43844b", penwidth=2.1];
     running [label="AUTO · RUNNING\n解释器读取 + TP 执行\nPause / Stop / Power Off / ESTOP", fillcolor="#e5effa", color="#526da8", penwidth=2.1];
-    paused [label="AUTO · PAUSED\n轨迹冻结但保留\nResume / Stop / Power Off / ESTOP", fillcolor="#fcebdc", color="#bd6a28", penwidth=2.1];
+    paused [label="AUTO / MDI · PAUSED\n轨迹与恢复状态保留；通信连接持续\nClear / Override / Step 后仍可 Resume\n命令拒绝不产生 seq 断档", fillcolor="#fcebdc", color="#bd6a28", penwidth=2.1];
     ended [label="INTERP_IDLE · completed / aborted\nWeb 状态标签不是 LinuxCNC 枚举\n保留 taskfile；Run 重新打开第 0 行", fillcolor="#e9f5e8", color="#43844b"];
 
     { rank=same; estop; off; on_unhomed; idle; }
@@ -135,14 +135,14 @@ digraph LinuxCncAxisWebControlLogic {
     ];
 
     manual_controls [
-      label="手动控制\n\nmanual-axis-x / y / z / a / c  (本地选择)\nmanual-jog-increment  (本地选择)\nmanual-jog-negative / positive  (JOG_START -> release JOG_STOP)\nmanual-home-axis  (HOME axis)\nmanual-touch-off  (TOUCH_OFF / G10 L20)\nmanual-tool-touch-off  (blocked_by_abi_tool_offsets)\nmanual-override-limits  (blocked_by_abi)\nmanual-spindle-ccw / stop / cw  (SPINDLE_COMMAND)\nmanual-spindle-decrease / increase\n  (SPINDLE_COMMAND -> release SPINDLE_CONSTANT)\nmanual-spindle-brake  (SPINDLE_BRAKE)\nmanual-coolant-mist / flood  (COOLANT_COMMAND)",
+      label="手动控制\n\nmanual-axis-x / y / z / a / c  (本地选择)\nmanual-jog-increment  (本地选择)\nmanual-jog-negative / positive  (JOG_START -> release JOG_STOP)\nmanual-home-axis  (BOTH: world-axis 拒绝)\nmanual-touch-off  (TOUCH_OFF / G10 L20)\nmanual-tool-touch-off  (blocked_by_abi_tool_offsets)\nmanual-override-limits  (blocked_by_abi)\nmanual-spindle-ccw / stop / cw  (SPINDLE_COMMAND)\nmanual-spindle-decrease / increase\n  (SPINDLE_COMMAND -> release SPINDLE_CONSTANT)\nmanual-spindle-brake  (SPINDLE_BRAKE)\nmanual-coolant-mist / flood  (COOLANT_COMMAND)",
       fontname="Noto Sans Mono CJK SC",
       fillcolor="#e9f5e8",
       color="#43844b"
     ];
 
     program_view_controls [
-      label="MDI / 视图 / DRO / 编辑\n\nmdi-command / mdi-submit  (MDI_EXECUTE)\nmdi-history-select  (本地选择，不自动执行)\ntab-manual / tab-mdi  (SET_MODE)\ntab-diagnostics / tab-preview / tab-dro  (本地投影)\ntoolbar-zoom-in / zoom-out  (本地相机)\ntoolbar-view-z / z2 / x / y / y2 / p  (本地视图)\ntoolbar-rotate  (本地交互模式)\ntoolbar-clear-live-plot  (VISUAL_CLEAR)\npreview-panLeft / panRight / panUp / panDown / reset\ndro-coordinate / dro-display / dro-units\nprogram-editor  (待提交文本；toolbar-reload 才生效)",
+      label="MDI / 视图 / DRO / 编辑\n\nmdi-command / mdi-submit  (MDI_EXECUTE)\nmdi-history-select  (单击选择；双击 MDI_EXECUTE)\ntab-manual / tab-mdi  (SET_MODE)\ntab-diagnostics / tab-preview / tab-dro  (本地投影)\ntoolbar-zoom-in / zoom-out  (本地相机)\ntoolbar-view-z / z2 / x / y / y2 / p  (本地视图)\ntoolbar-rotate  (本地交互模式)\ntoolbar-clear-live-plot  (VISUAL_CLEAR)\npreview-panLeft / panRight / panUp / panDown / reset\ndro-coordinate / dro-display / dro-units\nprogram-editor  (待提交文本；toolbar-reload 才生效)",
       fontname="Noto Sans Mono CJK SC",
       fillcolor="#edf6f8",
       color="#3c8091"
@@ -177,17 +177,17 @@ digraph LinuxCncAxisWebControlLogic {
       color="#b08a2e"
     ];
     load_tx [
-      label="文件替换事务\n1 原生 UI gate：INTERP_IDLE\n2 Web 安全适配：TP/MDI queue=0\n3 save mode -> ensure MANUAL\n4 可选 FILTER -> restore saved mode\n5 first line 0 -> task_plan_synch\n6 program_open / PROGRAM_LOAD\n7 新 AxisCanon + 状态派生 preview init\n8 set_mode_from_tab；Live Plot 不清除",
+      label="文件替换事务\n1 原生 UI gate：INTERP_IDLE\n2 Web 安全适配：TP/MDI queue=0\n3 save mode -> ensure MANUAL\n4 可选 FILTER -> restore saved mode\n5 first line 0 -> task_plan_synch\n6 program_open / PROGRAM_LOAD\n7 新 AxisCanon + 状态派生 preview init\n8 set_mode_from_tab；与原生一致：Live Plot 保留",
       fillcolor="#eef2fb",
       color="#526da8"
     ];
     manual_tx [
-      label="手动 / MDI 事务\nmanual_ok = ON 且非运行\nHOME: ensure MANUAL -> home\nJOG: press start -> release stop\nTOUCH_OFF: save mode -> MDI -> G10 L20\n  -> wait/sync/reload -> restore mode\nMDI: queue 未满 -> ensure MDI -> c.mdi",
+      label="手动 / MDI 事务\nmanual_ok = ON 且非运行\nHOME: ensure MANUAL -> home\nJOG: 一次 start -> WASM 限位目标 -> SIM_STEP\n  -> release / blur / hidden 一次 stop\nTOUCH_OFF: save mode -> MDI -> G10 L20\n  -> 保留位置、偏置 -> preview / relative -> restore mode\nMDI: queue 未满 -> ensure MDI -> c.mdi",
       fillcolor="#e9f5e8",
       color="#43844b"
     ];
     run_tx [
-      label="程序执行事务\nRun UI gate：ON + INTERP_IDLE\nrun_warn -> ensure AUTO -> AUTO_RUN line 0\nStep UI gate：ON + taskfile\nPause：READING/WAITING；Resume：PAUSED\nStop：ON + 非 IDLE -> abort/wait/plan close\nCompleted/Aborted：taskfile 保留；Run reopen line 0",
+      label="程序执行事务\nRun UI gate：ON + INTERP_IDLE\nrun_warn (原生；Web 警告待补齐) -> ensure AUTO -> AUTO_RUN line 0\nStep UI gate：ON + taskfile\nStep: 首次暂停 / 读下一行 / TP 执行 ID 边界\nPause：READING/WAITING；Resume：PAUSED\nStop：ON + 非 IDLE -> abort/wait/plan close\nCompleted/Aborted：taskfile 保留；Run reopen line 0",
       fillcolor="#fcebdc",
       color="#bd6a28"
     ];
@@ -211,7 +211,7 @@ digraph LinuxCncAxisWebControlLogic {
     live_running [label="RUNNING\npositionlogger / motion_trace 累积", fillcolor="#e9f5e8", color="#43844b"];
     live_paused [label="PAUSED\n冻结且保留同一轨迹", fillcolor="#fcebdc", color="#bd6a28"];
     live_retained [label="STOPPED / COMPLETED\n保留完整加工轨迹", fillcolor="#e9f5e8", color="#43844b"];
-    live_clear [label="唯一源程序清除边界\nCtrl-K / Clear Live Plot\nVISUAL_CLEAR -> live_path_epoch + 1\nRun · Reload · Open 均不得清除", fillcolor="#f8e7e5", color="#b94f45", penwidth=2.1];
+    live_clear [label="唯一源程序清除边界\nCtrl-K / Clear Live Plot\nVISUAL_CLEAR -> live_path_epoch + 1\n原生及 Web：Open / Reload / Run 均保留", fillcolor="#f8e7e5", color="#b94f45", penwidth=2.1];
 
     f_anchor [shape=point, width=0, height=0, label="", style=invis];
     { rank=same; static_preview; f_anchor; live_clear; }
@@ -223,7 +223,7 @@ digraph LinuxCncAxisWebControlLogic {
     live_running -> live_retained [label="Stop / Complete"];
     live_clear -> live_empty [label="epoch change"];
     live_retained -> live_running [label="Run / 重跑 / 换程序后继续累积", color="#43844b"];
-    live_retained -> live_clear [label="仅 Clear Live Plot", color="#b94f45"];
+    live_retained -> live_clear [label="仅 Clear Live Plot / Ctrl-K", color="#b94f45"];
     static_preview -> live_running [label="相互独立", style=dashed, dir=both, arrowtail=none, color="#526da8"];
   }