feat: visually group settings by category with collapsible cards

- Each command category (Better Formatting, Line Operations, etc.) now
  renders as a collapsible <details> card with a bordered/shaded header
  showing an 'N/M enabled' badge, instead of a flat list separated only
  by bold text headings.
- Sentence regex + reset moved into the Sentence Navigator category
  card (it configures that category's commands, so it belongs there
  instead of the general section).
- Bulk actions (global enable/disable all, per-category toggle-all,
  regex reset) now patch the DOM in place instead of calling the full
  display() re-render, so open/closed category state is never lost
  when a setting changes.
- Removed the 'General' settings heading (obsidianmd/settings-tab/no-problematic-settings-headings
  lint rule flags it).
- styles.css adds .bindthem-category-* rules for the card borders,
  header shading, collapse caret, and setting-row separators.

src/settings.ts

@@ -1,4 +1,4 @@
-import { App, PluginSettingTab, Setting } from 'obsidian';
+import { App, PluginSettingTab, Setting, TextComponent } from 'obsidian';
 import BindThemPlugin from './main';
 import { DEFAULT_SENTENCE_REGEX } from './Constants';
 
@@ -164,6 +164,13 @@ export const DEFAULT_SETTINGS: BindThemSettings = {
 export class BindThemSettingTab extends PluginSettingTab {
 	plugin: BindThemPlugin;
 
+	/**
+	 * Refresh functions for each rendered category body. Bulk actions call
+	 * these directly instead of re-running `display()`, so toggling a
+	 * setting never collapses categories the user has open.
+	 */
+	private categoryRefreshers: Array<() => void> = [];
+
 	constructor(app: App, plugin: BindThemPlugin) {
 		super(app, plugin);
 		this.plugin = plugin;
@@ -172,6 +179,7 @@ export class BindThemSettingTab extends PluginSettingTab {
 	display(): void {
 		const { containerEl } = this;
 		containerEl.empty();
+		this.categoryRefreshers = [];
 
 		// Hotkeys link at the top
 		containerEl.createEl('a', {
@@ -184,14 +192,10 @@ export class BindThemSettingTab extends PluginSettingTab {
 		}, (el) => {
 			el.addEventListener('click', (e) => {
 				e.preventDefault();
-				const hotkeysTab = (this.app as unknown as { setting: { openTabById: (id: string) => unknown } }).setting.openTabById('hotkeys');
-				if (hotkeysTab) {
-					(hotkeysTab as unknown as { searchComponent: { setValue: (v: string) => void } }).searchComponent.setValue('BindThem');
-				}
+				this.openHotkeysSearch();
 			});
 		});
 
-		// General settings
 		new Setting(containerEl)
 			.setName('Debug mode')
 			.setDesc('Enable debug logging to console')
@@ -202,36 +206,16 @@ export class BindThemSettingTab extends PluginSettingTab {
 					await this.plugin.saveSettings();
 				}));
 
-		new Setting(containerEl)
-			.setName('Sentence regex')
-			.setDesc('Regular expression used to match sentences')
-			.addText(text => text
-				.setValue(this.plugin.settings.sentenceRegexSource)
-				.onChange(async (value) => {
-					this.plugin.settings.sentenceRegexSource = value;
-					await this.plugin.saveSettings();
-				}));
-
-		new Setting(containerEl)
-			.setName('Reset sentence regex')
-			.addButton(button => button
-				.setButtonText('Reset')
-				.onClick(async () => {
-					this.plugin.settings.sentenceRegexSource = DEFAULT_SENTENCE_REGEX;
-					await this.plugin.saveSettings();
-					this.display();
-				}));
-
 		// Commands section header
 		new Setting(containerEl)
 			.setName('Command availability')
-			.setDesc('Toggle which commands are available in Obsidian. Disabled commands will not appear in the command palette.')
+			.setDesc('Toggle which commands are available in Obsidian. Disabled commands will not appear in the command palette. Select a category below to see its commands.')
 			.setHeading();
 
-		// Category toggle buttons
+		// Global toggle-all buttons
 		new Setting(containerEl)
 			.setName('Enable/disable all')
-			.setDesc('Toggle all commands on or off')
+			.setDesc('Toggle every command in every category on or off')
 			.addButton(button => button
 				.setButtonText('Enable all')
 				.onClick(async () => {
@@ -239,7 +223,7 @@ export class BindThemSettingTab extends PluginSettingTab {
 						this.plugin.settings.enabledCommands[cmdId] = true;
 					}
 					await this.plugin.saveSettings();
-					this.display();
+					this.refreshAllCategories();
 				}))
 			.addButton(button => button
 				.setButtonText('Disable all')
@@ -249,12 +233,13 @@ export class BindThemSettingTab extends PluginSettingTab {
 						this.plugin.settings.enabledCommands[cmdId] = false;
 					}
 					await this.plugin.saveSettings();
-					this.display();
+					this.refreshAllCategories();
 				}));
 
-		// Render each category
+		// Render each category as a collapsible, visually grouped card
+		const categoryListEl = containerEl.createDiv({ cls: 'bindthem-category-list' });
 		for (const [categoryKey, categoryName] of Object.entries(COMMAND_CATEGORIES)) {
-			this.renderCategory(containerEl, categoryKey, categoryName);
+			this.renderCategory(categoryListEl, categoryKey, categoryName);
 		}
 
 		// About section
@@ -265,35 +250,78 @@ export class BindThemSettingTab extends PluginSettingTab {
 			.setHeading();
 	}
 
+	/**
+	 * Opens the Hotkeys settings tab and pre-fills its search with "BindThem".
+	 * `app.setting` (the settings modal controller) isn't part of Obsidian's
+	 * public API types, so the shape is narrowed once here rather than cast
+	 * inline at each property access.
+	 */
+	private openHotkeysSearch(): void {
+		const appWithSettingModal = this.app as unknown as {
+			setting: {
+				openTabById: (id: string) => { searchComponent: { setValue: (v: string) => void } } | null;
+			};
+		};
+		const hotkeysTab = appWithSettingModal.setting.openTabById('hotkeys');
+		if (hotkeysTab) {
+			hotkeysTab.searchComponent.setValue('BindThem');
+		}
+	}
+
+	private refreshAllCategories(): void {
+		for (const refresh of this.categoryRefreshers) {
+			refresh();
+		}
+	}
+
 	private renderCategory(containerEl: HTMLElement, categoryKey: string, categoryName: string): void {
 		const commands = COMMANDS[categoryKey as keyof typeof COMMANDS];
 		if (!commands || commands.length === 0) return;
 
-		// Category header with toggle all
-		const categorySetting = new Setting(containerEl)
-			.setName(categoryName)
-			.setHeading();
+		const details = containerEl.createEl('details', { cls: 'bindthem-category' });
+		const summary = details.createEl('summary', { cls: 'bindthem-category-summary' });
+		summary.createSpan({ text: categoryName, cls: 'bindthem-category-name' });
+		const badge = summary.createSpan({ cls: 'bindthem-category-count' });
 
-		// Check if all commands in this category are enabled
-		const allEnabled = commands.every(cmd => this.plugin.settings.enabledCommands[cmd.id] !== false);
+		const content = details.createDiv({ cls: 'bindthem-category-content' });
 
-		// Add toggle all button for this category
-		categorySetting.addToggle(toggle => {
-			toggle
-				.setValue(allEnabled)
+		const refresh = () => this.renderCategoryBody(content, badge, categoryKey, commands);
+		refresh();
+		this.categoryRefreshers.push(refresh);
+	}
+
+	private renderCategoryBody(
+		content: HTMLElement,
+		badge: HTMLElement,
+		categoryKey: string,
+		commands: CommandDefinition[]
+	): void {
+		content.empty();
+
+		const enabledCount = commands.filter(cmd => this.plugin.settings.enabledCommands[cmd.id] !== false).length;
+		badge.setText(`${enabledCount}/${commands.length} enabled`);
+
+		// Sentence regex configures the Sentence Navigator commands, so it
+		// lives inside that category's card instead of the general section.
+		if (categoryKey === 'sentenceNavigator') {
+			this.renderSentenceRegexSetting(content);
+		}
+
+		new Setting(content)
+			.setName('Enable all in this category')
+			.addToggle(toggle => toggle
+				.setValue(enabledCount === commands.length)
 				.setTooltip('Toggle all commands in this category')
 				.onChange(async (value) => {
 					for (const cmd of commands) {
 						this.plugin.settings.enabledCommands[cmd.id] = value;
 					}
 					await this.plugin.saveSettings();
-					this.display();
-				});
-		});
+					this.renderCategoryBody(content, badge, categoryKey, commands);
+				}));
 
-		// Render individual commands
 		for (const cmd of commands) {
-			new Setting(containerEl)
+			new Setting(content)
 				.setName(cmd.name)
 				.setDesc(cmd.description || `Command ID: ${cmd.id}`)
 				.addToggle(toggle => toggle
@@ -301,7 +329,40 @@ export class BindThemSettingTab extends PluginSettingTab {
 					.onChange(async (value) => {
 						this.plugin.settings.enabledCommands[cmd.id] = value;
 						await this.plugin.saveSettings();
+						const newCount = commands.filter(c => this.plugin.settings.enabledCommands[c.id] !== false).length;
+						badge.setText(`${newCount}/${commands.length} enabled`);
 					}));
 		}
 	}
+
+	/**
+	 * Renders the sentence-matching regex setting and its reset button.
+	 * Updates the text field directly on reset instead of re-rendering.
+	 */
+	private renderSentenceRegexSetting(containerEl: HTMLElement): void {
+		let textComponent: TextComponent | undefined;
+
+		new Setting(containerEl)
+			.setName('Sentence regex')
+			.setDesc('Regular expression used to match sentences')
+			.addText(text => {
+				textComponent = text;
+				text
+					.setValue(this.plugin.settings.sentenceRegexSource)
+					.onChange(async (value) => {
+						this.plugin.settings.sentenceRegexSource = value;
+						await this.plugin.saveSettings();
+					});
+			});
+
+		new Setting(containerEl)
+			.setName('Reset sentence regex')
+			.addButton(button => button
+				.setButtonText('Reset')
+				.onClick(async () => {
+					this.plugin.settings.sentenceRegexSource = DEFAULT_SENTENCE_REGEX;
+					await this.plugin.saveSettings();
+					textComponent?.setValue(DEFAULT_SENTENCE_REGEX);
+				}));
+	}
 }

styles.css

@@ -1,8 +1,72 @@
-/*
-
-This CSS file will be included with your plugin, and
-available in the app when your plugin is enabled.
-
-If your plugin does not need CSS, delete this file.
-
-*/
+/*
+
+This CSS file will be included with your plugin, and
+available in the app when your plugin is enabled.
+
+*/
+
+/* ============================================================
+   Settings tab — command category grouping
+   ============================================================ */
+
+.bindthem-category-list {
+	margin-bottom: 0.5em;
+}
+
+.bindthem-category {
+	border: 1px solid var(--background-modifier-border);
+	border-radius: var(--radius-m);
+	margin-bottom: 0.5em;
+	overflow: hidden;
+}
+
+.bindthem-category > summary {
+	display: flex;
+	align-items: center;
+	justify-content: space-between;
+	gap: 0.75em;
+	padding: 0.65em 1em;
+	cursor: pointer;
+	font-weight: 600;
+	background-color: var(--background-secondary);
+	list-style: none;
+}
+
+.bindthem-category > summary::-webkit-details-marker {
+	display: none;
+}
+
+.bindthem-category > summary::before {
+	content: '▸';
+	display: inline-block;
+	margin-right: 0.5em;
+	color: var(--text-muted);
+	transition: transform 0.15s ease-in-out;
+}
+
+.bindthem-category[open] > summary::before {
+	transform: rotate(90deg);
+}
+
+.bindthem-category-name {
+	flex: 1;
+}
+
+.bindthem-category-count {
+	font-weight: 400;
+	font-size: var(--font-ui-smaller);
+	color: var(--text-muted);
+	white-space: nowrap;
+}
+
+.bindthem-category-content {
+	padding: 0 1em;
+}
+
+.bindthem-category-content .setting-item {
+	border-top: 1px solid var(--background-modifier-border);
+}
+
+.bindthem-category-content .setting-item:first-child {
+	border-top: none;
+}