refactor(filter): extract preset management logic into FilterPresetManager

Move filter preset creation, deletion, application, and storage logic
from FilterManager into a dedicated FilterPresetManager class to
improve separation of concerns and maintainability.

- Add FilterPresetManager with preset CRUD operations
- Update FilterManager to use preset manager via composition
- Handle EMPTY_WILDCARD_MARKER for wildcard base model filters
- Add preset-related translations to all locale files
- Update filter preset UI styling and interactions

locales/zh-TW.json

@@ -10,7 +10,8 @@
             "next": "下一步",
             "backToTop": "回到頂部",
             "settings": "設定",
-            "help": "說明"
+            "help": "說明",
+            "add": "新增"
         },
         "status": {
             "loading": "載入中...",
@@ -204,6 +205,19 @@
         },
         "filter": {
             "title": "篩選模型",
+            "presets": "預設",
+            "savePreset": "將目前啟用的篩選器儲存為新預設。",
+            "savePresetDisabledActive": "無法儲存：已有預設處於啟用狀態。修改篩選器後可儲存新預設",
+            "savePresetDisabledNoFilters": "先選擇篩選器，然後儲存為預設",
+            "savePresetPrompt": "輸入預設名稱：",
+            "presetClickTooltip": "點擊套用預設 \"{name}\"",
+            "presetDeleteTooltip": "刪除預設",
+            "presetDeleteConfirm": "刪除預設 \"{name}\"？",
+            "presetDeleteConfirmClick": "再次點擊確認",
+            "presetOverwriteConfirm": "預設 \"{name}\" 已存在。是否覆蓋？",
+            "presetNamePlaceholder": "預設名稱...",
+            "restoreDefaults": "恢復預設",
+            "noPresets": "尚未儲存預設。選擇下方篩選器並點擊 + 儲存",
             "baseModel": "基礎模型",
             "modelTags": "標籤（前 20）",
             "modelTypes": "Model Types",
@@ -1419,7 +1433,26 @@
         "filters": {
             "applied": "{message}",
             "cleared": "篩選已清除",
-            "noCustomFilterToClear": "無自訂篩選可清除"
+            "noCustomFilterToClear": "無自訂篩選可清除",
+            "noActiveFilters": "沒有可儲存的啟用篩選"
+        },
+        "presets": {
+            "created": "預設 \"{name}\" 已建立",
+            "deleted": "預設 \"{name}\" 已刪除",
+            "applied": "預設 \"{name}\" 已套用",
+            "overwritten": "預設 \"{name}\" 已覆蓋",
+            "restored": "預設設定已恢復"
+        },
+        "error": {
+            "presetNameEmpty": "預設名稱不能為空",
+            "presetNameTooLong": "預設名稱不能超過 {max} 個字元",
+            "presetNameInvalidChars": "預設名稱包含無效字元",
+            "presetNameExists": "已存在同名預設",
+            "maxPresetsReached": "最多允許 {max} 個預設。刪除一個以新增更多。",
+            "presetNotFound": "預設未找到",
+            "invalidPreset": "無效的預設資料",
+            "deletePresetFailed": "刪除預設失敗",
+            "applyPresetFailed": "套用預設失敗"
         },
         "downloads": {
             "imagesCompleted": "範例圖片{action}完成",