feat(coding-agent): add treeFilterMode setting for /tree default filter (#1852)

Add configurable initial filter mode for the session tree navigator.
Users who always switch to a specific filter (e.g. no-tools via Ctrl+T)
can now set it as default in settings.

Same pattern as doubleEscapeAction (#404). Filter infra from #747.

packages/coding-agent/src/modes/interactive/interactive-mode.ts

@@ -3045,6 +3045,7 @@ export class InteractiveMode {
 					hideThinkingBlock: this.hideThinkingBlock,
 					collapseChangelog: this.settingsManager.getCollapseChangelog(),
 					doubleEscapeAction: this.settingsManager.getDoubleEscapeAction(),
+					treeFilterMode: this.settingsManager.getTreeFilterMode(),
 					showHardwareCursor: this.settingsManager.getShowHardwareCursor(),
 					editorPaddingX: this.settingsManager.getEditorPaddingX(),
 					autocompleteMaxVisible: this.settingsManager.getAutocompleteMaxVisible(),
@@ -3124,6 +3125,9 @@ export class InteractiveMode {
 					onDoubleEscapeActionChange: (action) => {
 						this.settingsManager.setDoubleEscapeAction(action);
 					},
+					onTreeFilterModeChange: (mode) => {
+						this.settingsManager.setTreeFilterMode(mode);
+					},
 					onShowHardwareCursorChange: (enabled) => {
 						this.settingsManager.setShowHardwareCursor(enabled);
 						this.ui.setShowHardwareCursor(enabled);
@@ -3413,6 +3417,7 @@ export class InteractiveMode {
 	private showTreeSelector(initialSelectedId?: string): void {
 		const tree = this.sessionManager.getTree();
 		const realLeafId = this.sessionManager.getLeafId();
+		const initialFilterMode = this.settingsManager.getTreeFilterMode();
 
 		if (tree.length === 0) {
 			this.showStatus("No entries in session");
@@ -3531,6 +3536,7 @@ export class InteractiveMode {
 					this.ui.requestRender();
 				},
 				initialSelectedId,
+				initialFilterMode,
 			);
 			return { component: selector, focus: selector };
 		});