Add CSPT entity, processed CSS source type, reverse filter, and UI improvements

- Add Color Strip Processing Template (CSPT) entity: reusable filter chains
  for 1D LED strip postprocessing (backend, storage, API, frontend CRUD)
- Add "processed" color strip source type that wraps another CSS source and
  applies a CSPT filter chain (dataclass, stream, schema, modal, cards)
- Add Reverse filter for strip LED order reversal
- Add CSPT and processed CSS nodes/edges to visual graph editor
- Add CSPT test preview WS endpoint with input source selection
- Add device settings CSPT template selector (add + edit modals with hints)
- Use icon grids for palette quantization preset selector in filter lists
- Use EntitySelect for template references and test modal source selectors
- Fix filters.css_filter_template.desc missing localization
- Fix icon grid cell height inequality (grid-auto-rows: 1fr)
- Rename "Processed" subtab to "Processing Templates"
- Localize all new strings (en/ru/zh)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

server/src/wled_controller/static/locales/zh.json

@@ -169,6 +169,8 @@
   "device.led_type.hint": "RGB（3通道）或 RGBW（4通道，带独立白色）",
   "device.send_latency": "发送延迟（毫秒）：",
   "device.send_latency.hint": "每帧模拟网络/串口延迟（毫秒）",
+  "device.css_processing_template": "色带处理模板：",
+  "device.css_processing_template.hint": "应用于此设备所有色带输出的默认处理模板",
   "device.mqtt_topic": "MQTT 主题：",
   "device.mqtt_topic.hint": "用于发布像素数据的 MQTT 主题路径（例如 mqtt://ledgrab/device/name）",
   "device.mqtt_topic.placeholder": "mqtt://ledgrab/device/客厅",
@@ -366,6 +368,7 @@
   "streams.description": "源定义采集管线。原始源使用采集模板从显示器采集。处理源对另一个源应用后处理。将源分配给设备。",
   "streams.group.raw": "屏幕采集",
   "streams.group.processed": "已处理",
+  "streams.group.css_processing": "处理模板",
   "streams.group.color_strip": "色带源",
   "streams.group.audio": "音频",
   "streams.section.streams": "源",
@@ -434,12 +437,16 @@
   "filters.color_correction.desc": "白平衡和色温调整",
   "filters.filter_template": "滤镜模板",
   "filters.filter_template.desc": "嵌入另一个处理模板",
+  "filters.css_filter_template": "色带滤镜模板",
+  "filters.css_filter_template.desc": "嵌入另一个色带处理模板",
   "filters.frame_interpolation": "帧插值",
   "filters.frame_interpolation.desc": "帧间混合以获得更平滑的输出",
   "filters.noise_gate": "噪声门",
   "filters.noise_gate.desc": "抑制低于阈值的细微色彩变化",
   "filters.palette_quantization": "调色板量化",
   "filters.palette_quantization.desc": "将颜色减少到有限调色板",
+  "filters.reverse": "反转",
+  "filters.reverse.desc": "反转色带中的LED顺序",
   "postprocessing.description_label": "描述（可选）：",
   "postprocessing.description_placeholder": "描述此模板...",
   "postprocessing.created": "模板创建成功",
@@ -455,6 +462,21 @@
   "postprocessing.test.running": "正在测试处理模板...",
   "postprocessing.test.error.no_stream": "请选择一个源",
   "postprocessing.test.error.failed": "处理模板测试失败",
+  "css_processing.title": "色带处理模板",
+  "css_processing.add": "添加色带处理模板",
+  "css_processing.edit": "编辑色带处理模板",
+  "css_processing.name": "模板名称：",
+  "css_processing.name_placeholder": "我的色带处理模板",
+  "css_processing.description_label": "描述（可选）：",
+  "css_processing.description_placeholder": "描述此模板...",
+  "css_processing.created": "色带处理模板已创建",
+  "css_processing.updated": "色带处理模板已更新",
+  "css_processing.deleted": "色带处理模板已删除",
+  "css_processing.delete.confirm": "确定要删除此色带处理模板吗？",
+  "css_processing.error.required": "请填写所有必填字段",
+  "css_processing.error.load": "加载色带处理模板出错",
+  "css_processing.error.delete": "删除色带处理模板出错",
+  "css_processing.error.clone_failed": "克隆色带处理模板失败",
   "device.button.stream_selector": "源设置",
   "device.stream_settings.title": "源设置",
   "device.stream_selector.label": "源：",
@@ -976,6 +998,14 @@
   "color_strip.candlelight.num_candles.hint": "灯带上独立蜡烛光源的数量。每支蜡烛有自己的闪烁模式。",
   "color_strip.candlelight.speed": "闪烁速度：",
   "color_strip.candlelight.speed.hint": "闪烁动画的速度。较高的值产生更快、更不安定的火焰。",
+  "color_strip.type.processed": "已处理",
+  "color_strip.type.processed.desc": "将处理模板应用于另一个源",
+  "color_strip.type.processed.hint": "包装现有色带源并通过滤镜链处理其输出。",
+  "color_strip.processed.input": "输入源：",
+  "color_strip.processed.input.hint": "将被处理的色带源",
+  "color_strip.processed.template": "处理模板：",
+  "color_strip.processed.template.hint": "应用于输入源输出的滤镜链",
+  "color_strip.processed.error.no_input": "请选择输入源",
   "color_strip.composite.layers": "图层：",
   "color_strip.composite.layers.hint": "叠加多个色带源。第一个图层在底部，最后一个在顶部。每个图层可以有自己的混合模式和不透明度。",
   "color_strip.composite.add_layer": "+ 添加图层",
@@ -992,6 +1022,7 @@
   "color_strip.composite.opacity": "不透明度",
   "color_strip.composite.brightness": "亮度",
   "color_strip.composite.brightness.none": "— 无 —",
+  "color_strip.composite.processing": "处理",
   "color_strip.composite.enabled": "启用",
   "color_strip.composite.error.min_layers": "至少需要 1 个图层",
   "color_strip.composite.error.no_source": "每个图层必须选择一个源",
@@ -1131,6 +1162,7 @@
   "streams.group.value": "值源",
   "streams.group.sync": "同步时钟",
   "tree.group.picture": "图片",
+  "tree.group.strip": "色带",
   "tree.group.utility": "工具",
   "value_source.group.title": "值源",
   "value_source.select_type": "选择值源类型",