feat(clipping): implement hide/recover toggle for all section dialogs

Update all three section dialogs to support hide/show toggle:

SectionAxisDialogManager:
- onHideToggle now calls hideSection()/recoverSection()

SectionBoxDialogManager:
- onHideToggle now calls hideSection()/recoverSection()

SectionPlanePanel:
- Add isHidden state tracking
- Change onHide to onHideToggle(isHidden)
- Add setHiddenState/getHiddenState methods
- Update button to toggle active state

SectionPlaneDialogManager:
- Switch to onHideToggle callback
- Call hideSection()/recoverSection() based on toggle state

Behavior: Click hide button to hide section, click again to recover.

src/locales/en-US.ts

@@ -178,5 +178,28 @@ export const enUS: TranslationDictionary = {
     },
     map: {
         dialogTitle: 'Map'
+    },
+    aiChat: {
+        title: 'AI Assistant',
+        placeholder: 'Ask a question...',
+        quickPrompt: {
+            summarize: 'Summarize this model',
+            explain: 'Explain selected component',
+            generate: 'Generate report'
+        },
+        action: {
+            new: 'New Chat',
+            history: 'History',
+            settings: 'Settings',
+            close: 'Close'
+        },
+        helper: {
+            newline: 'Shift + Enter for new line',
+            send: 'Enter to send'
+        },
+        thinking: 'Thinking...',
+        other: 'Other',
+        otherPlaceholder: 'Enter custom answer',
+        submit: 'Submit'
     }
 };