ui: Improve Chat Form Actions UI/UX (models selector, add panel) (#27746)

* ui : strip trailing container-format segments from parsed model names

* ui : show reasoning and modality icons on model options and search by modality

* ui : keep reasoning submenu visible regardless of model state

* ui : add show-org-name-in-trigger display setting

* ui : move model list into a submenu within the model selector

* ui : make model option hover and focus highlight override the active state

* ui : add raw model id tooltip to model selector options

* feat: Enable microphone input as default for audio models

* ui : fix eslint issues in chat form and model selector

* ui: show modality icons instead of file submenu in chat add menu

Assisted-by: pi

* chore: Format

* chore: Format

* ui: add ModelCapability enum and shared modality/capability icon constants

Assisted by: pi:GLM-5.3-Flash

* ui: derive modality badge icons and labels from shared constants

Assisted by: pi:GLM-5.3-Flash

* ui: split model option icons into capabilities and modalities

Replace the supportsThinking flag on ModelId with a capabilities object
keyed like ModelModalities, so future capabilities (tool calls, etc.)
slot in alongside reasoning. Icons and labels now come from the shared
CAPABILITY_ICONS/MODALITY_ICONS constants.

Assisted by: pi:GLM-5.3-Flash

tools/ui/src/lib/hooks/use-reasoning-menu.svelte.ts

@@ -8,6 +8,7 @@ import { getConversationModel } from '$lib/utils';
 export interface UseReasoningMenuReturn {
 	readonly modelSupportsThinking: boolean;
 	readonly thinkingEnabled: boolean;
+	readonly isReasoningActive: boolean;
 	readonly isOff: boolean;
 	readonly currentEffort: ReasoningEffort;
 	readonly levels: ReasoningEffortLevel[];
@@ -59,6 +60,12 @@ export function useReasoningMenu(): UseReasoningMenuReturn {
 	const thinkingEnabled = $derived(
 		currentEffort !== ReasoningEffort.OFF && currentEffort !== ReasoningEffort.DEFAULT
 	);
+	// Thinking is effectively on (lightbulb lit) either when an explicit effort
+	// is selected, or when the effort is left at "Default" and the model
+	// supports thinking.
+	const isReasoningActive = $derived(
+		thinkingEnabled || (currentEffort === ReasoningEffort.DEFAULT && modelSupportsThinking)
+	);
 
 	return {
 		get currentEffort() {
@@ -67,6 +74,9 @@ export function useReasoningMenu(): UseReasoningMenuReturn {
 		get isOff() {
 			return currentEffort === ReasoningEffort.OFF;
 		},
+		get isReasoningActive() {
+			return isReasoningActive;
+		},
 		isSelected(level: ReasoningEffortLevel): boolean {
 			return currentEffort === level.value;
 		},