ui: Restructure repo to use tools/ui folder and ui / UI / llama-ui / LLAMA_UI naming (#23064)

* webui: Move static build output from `tools/server/public` to `build/ui` directory

* refactor: Move to `tools/ui`

* refactor: rename CMake variables and preprocessor defines

- Rename LLAMA_BUILD_WEBUI -> LLAMA_BUILD_UI (old kept as deprecated)
- Rename LLAMA_USE_PREBUILT_WEBUI -> LLAMA_USE_PREBUILT_UI (old kept as deprecated)
- Backward compat: old vars auto-forward to new ones with DEPRECATION warning
- Rename internal vars: WEBUI_SOURCE -> UI_SOURCE, WEBUI_SOURCE_DIR -> UI_SOURCE_DIR, etc.
- Rename HF bucket: LLAMA_WEBUI_HF_BUCKET -> LLAMA_UI_HF_BUCKET
- Emit both LLAMA_BUILD_WEBUI and LLAMA_BUILD_UI preprocessor defines
- Emit both LLAMA_WEBUI_DEFAULT_ENABLED and LLAMA_UI_DEFAULT_ENABLED

* refactor: rename CLI flags (--webui -> --ui) with backward compat

- Add --ui/--no-ui (old --webui/--no-webui kept as deprecated aliases)
- Add --ui-config (old --webui-config kept as deprecated alias)
- Add --ui-config-file (old --webui-config-file kept as deprecated alias)
- Add --ui-mcp-proxy/--no-ui-mcp-proxy (old --webui-mcp-proxy kept as deprecated)
- Add new env vars: LLAMA_ARG_UI, LLAMA_ARG_UI_CONFIG, LLAMA_ARG_UI_CONFIG_FILE, LLAMA_ARG_UI_MCP_PROXY
- C++ struct fields: params.ui, params.ui_config_json, params.ui_mcp_proxy added alongside old fields
- Backward compat: old fields synced to new ones in g_params_to_internals

* refactor: update C++ server internals with backward compat

- Rename json_webui_settings -> json_ui_settings (both kept in server_context_meta)
- Rename params.webui usage -> params.ui (both synced, old still works)
- JSON API emits both "ui"/"ui_settings" and "webui"/"webui_settings" keys
- Server routes use params.ui_mcp_proxy || params.webui_mcp_proxy
- Preprocessor guards use #if defined(LLAMA_BUILD_UI) || defined(LLAMA_BUILD_WEBUI)

* refactor: rename CI/CD workflows, artifacts, and build script

- Rename webui-build.yml -> ui-build.yml; artifact webui-build -> ui-build
- Rename webui-publish.yml -> ui-publish.yml; var HF_BUCKET_WEBUI_STATIC_OUTPUT -> HF_BUCKET_UI_STATIC_OUTPUT
- Rename server-webui.yml -> server-ui.yml; job webui-build/checks -> ui-build/checks
- Update server.yml: job/artifact refs webui-build -> ui-build
- Update release.yml: all webui-build/publish refs -> ui-build/publish; HF_TOKEN_WEBUI_STATIC_OUTPUT -> HF_TOKEN_UI_STATIC_OUTPUT
- Update server-self-hosted.yml: webui-build -> ui-build
- Update build-self-hosted.yml: HF_WEBUI_VERSION -> HF_UI_VERSION
- Rename webui-download.cmake -> ui-download.cmake (internal refs updated)
- Update labeler.yml: server/webui -> server/ui path label

* docs: update CODEOWNERS and server README docs

- Update CODEOWNERS: team ggml-org/llama-webui -> ggml-org/llama-ui, path /tools/server/webui/ -> /tools/ui/
- Update server README.md: CLI tables show --ui flags with deprecated --webui aliases
- Update server README-dev.md: "WebUI" -> "UI", paths updated to tools/ui/

* fix: Small fixes for UI build

* fix: CMake.txt syntax

* chore: Formatting

* fix: `.editorconfig` for llama-ui

* chore: Formatting

* refactor: Use `APP_NAME` in Error route

* refactor: Cleanup

* refactor: Single migration service

* make llama-ui a linkable target

* fix: UI Build output

* fix: Missing change

* fix: separate llama-ui npm build output into build/tools/ui/dist subfolder + use cmake npm build instead of downloading ui-build.yml artifacts in CI

* refactor: UI workflows cleanup

---------

Co-authored-by: Xuan Son Nguyen <son@huggingface.co>

tools/ui/src/lib/contexts/chat-actions.context.ts

@@ -0,0 +1,39 @@
+import { getContext, setContext } from 'svelte';
+import { CONTEXT_KEY_CHAT_ACTIONS } from '$lib/constants';
+
+export interface ChatActionsContext {
+	copy: (message: DatabaseMessage) => void;
+	delete: (message: DatabaseMessage) => void;
+	navigateToSibling: (siblingId: string) => void;
+	editWithBranching: (
+		message: DatabaseMessage,
+		newContent: string,
+		newExtras?: DatabaseMessageExtra[]
+	) => void;
+	editWithReplacement: (
+		message: DatabaseMessage,
+		newContent: string,
+		shouldBranch: boolean
+	) => void;
+	editUserMessagePreserveResponses: (
+		message: DatabaseMessage,
+		newContent: string,
+		newExtras?: DatabaseMessageExtra[]
+	) => void;
+	regenerateWithBranching: (message: DatabaseMessage, modelOverride?: string) => void;
+	continueAssistantMessage: (message: DatabaseMessage) => void;
+	forkConversation: (
+		message: DatabaseMessage,
+		options: { name: string; includeAttachments: boolean }
+	) => void;
+}
+
+const CHAT_ACTIONS_KEY = Symbol.for(CONTEXT_KEY_CHAT_ACTIONS);
+
+export function setChatActionsContext(ctx: ChatActionsContext): ChatActionsContext {
+	return setContext(CHAT_ACTIONS_KEY, ctx);
+}
+
+export function getChatActionsContext(): ChatActionsContext {
+	return getContext(CHAT_ACTIONS_KEY);
+}

tools/ui/src/lib/contexts/chat-settings-config.context.ts

@@ -0,0 +1,20 @@
+import { getContext, setContext } from 'svelte';
+import { CONTEXT_KEY_CHAT_SETTINGS_CONFIG } from '$lib/constants';
+
+export interface ChatSettingsConfigContext {
+	readonly localConfig: SettingsConfigType;
+	handleConfigChange: (key: string, value: string | boolean) => void;
+	handleThemeChange: (theme: string) => void;
+}
+
+const CHAT_SETTINGS_CONFIG_KEY = Symbol.for(CONTEXT_KEY_CHAT_SETTINGS_CONFIG);
+
+export function setChatSettingsConfigContext(
+	ctx: ChatSettingsConfigContext
+): ChatSettingsConfigContext {
+	return setContext(CHAT_SETTINGS_CONFIG_KEY, ctx);
+}
+
+export function getChatSettingsConfigContext(): ChatSettingsConfigContext {
+	return getContext(CHAT_SETTINGS_CONFIG_KEY);
+}

tools/ui/src/lib/contexts/index.ts

@@ -0,0 +1,25 @@
+export {
+	getMessageEditContext,
+	setMessageEditContext,
+	type MessageEditContext,
+	type MessageEditState,
+	type MessageEditActions
+} from './message-edit.context';
+
+export {
+	getChatActionsContext,
+	setChatActionsContext,
+	type ChatActionsContext
+} from './chat-actions.context';
+
+export {
+	getChatSettingsConfigContext,
+	setChatSettingsConfigContext,
+	type ChatSettingsConfigContext
+} from './chat-settings-config.context';
+
+export {
+	getProcessingInfoContext,
+	setProcessingInfoContext,
+	type ProcessingInfoContext
+} from './processing-info.context';

tools/ui/src/lib/contexts/message-edit.context.ts

@@ -0,0 +1,51 @@
+import { getContext, setContext } from 'svelte';
+import { CONTEXT_KEY_MESSAGE_EDIT } from '$lib/constants';
+import { MessageRole } from '$lib/enums';
+
+export interface MessageEditState {
+	readonly isEditing: boolean;
+	readonly editedContent: string;
+	readonly editedExtras: DatabaseMessageExtra[];
+	readonly editedUploadedFiles: ChatUploadedFile[];
+	readonly originalContent: string;
+	readonly originalExtras: DatabaseMessageExtra[];
+	readonly showSaveOnlyOption: boolean;
+	readonly showBranchAfterEditOption: boolean;
+	readonly shouldBranchAfterEdit: boolean;
+	readonly messageRole: MessageRole;
+	readonly rawEditContent?: string;
+}
+
+export interface MessageEditActions {
+	setContent: (content: string) => void;
+	setExtras: (extras: DatabaseMessageExtra[]) => void;
+	setUploadedFiles: (files: ChatUploadedFile[]) => void;
+	save: () => void;
+	saveOnly: () => void;
+	cancel: () => void;
+	startEdit: () => void;
+}
+
+export interface AssistantEditActions {
+	setShouldBranchAfterEdit: (value: boolean) => void;
+}
+
+export type MessageEditContext = MessageEditState &
+	MessageEditActions &
+	Partial<AssistantEditActions>;
+
+const MESSAGE_EDIT_KEY = Symbol.for(CONTEXT_KEY_MESSAGE_EDIT);
+
+/**
+ * Sets the message edit context. Call this in the parent component (ChatMessage.svelte).
+ */
+export function setMessageEditContext(ctx: MessageEditContext): MessageEditContext {
+	return setContext(MESSAGE_EDIT_KEY, ctx);
+}
+
+/**
+ * Gets the message edit context. Call this in child components.
+ */
+export function getMessageEditContext(): MessageEditContext {
+	return getContext(MESSAGE_EDIT_KEY);
+}

tools/ui/src/lib/contexts/processing-info.context.ts

@@ -0,0 +1,16 @@
+import { getContext, setContext } from 'svelte';
+import { CONTEXT_KEY_PROCESSING_INFO } from '$lib/constants';
+
+export interface ProcessingInfoContext {
+	readonly showProcessingInfo: boolean;
+}
+
+const PROCESSING_INFO_KEY = Symbol.for(CONTEXT_KEY_PROCESSING_INFO);
+
+export function setProcessingInfoContext(ctx: ProcessingInfoContext): ProcessingInfoContext {
+	return setContext(PROCESSING_INFO_KEY, ctx);
+}
+
+export function getProcessingInfoContext(): ProcessingInfoContext {
+	return getContext(PROCESSING_INFO_KEY);
+}