Block Editor: Implements hints for Tabs (fixes #21178)

[nielslyngsoe]

Implements hints for tabs of the Block Workspace. Notice how this is used for all Blocks, in the Modal when editing Blocks, and when editing List Blocks in inline-mode.

This generally finished the implementation of badges, it seems there where a few missing links/bindings between the View Contexts.

Here a few screenshots of the scenarios I have tested:

[Copilot]

Pull request overview

Implements tab-level hint/badge support in the Block Workspace by introducing per-tab view contexts and wiring validation hints into those contexts so tab headers can display badges when a tab contains validation issues.

Changes:

• Add per-tab UmbViewController instances in block workspace edit views and render tab badges based on firstHintOfVariant.
• Switch block element managers from UmbHintContext to UmbViewContext and route validation hints through view.hints.
• Wire block workspace content/settings views to inherit from the workspace view (but includes a stray debug subscription).

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 6 comments.

File	Description
src/Umbraco.Web.UI.Client/src/packages/block/block/workspace/views/edit/block-workspace-view-edit.element.ts	Creates/provides per-tab view contexts and renders hint badges in router-based block edit tabs.
src/Umbraco.Web.UI.Client/src/packages/block/block/workspace/views/edit/block-workspace-view-edit-content-no-router.element.ts	Adds similar per-tab view contexts + hint badge rendering for inline/no-router block editing.
src/Umbraco.Web.UI.Client/src/packages/block/block/workspace/block-workspace.context.ts	Hooks up view inheritance for content/settings views (but also adds a debug console subscription).
src/Umbraco.Web.UI.Client/src/packages/block/block/workspace/block-element-manager.ts	Replaces hint context with view context and connects validation-to-hints to view.hints.

Comments suppressed due to low confidence (1)

src/Umbraco.Web.UI.Client/src/packages/block/block/workspace/views/edit/block-workspace-view-edit-content-no-router.element.ts:71

• When _hasRootProperties changes, you don’t call #setupViewContexts(). If root properties become available after initial load, the required view context (and its hint observer) will never be created. Call #setupViewContexts() from the hasProperties observer as well.

		this.observe(
			this.#tabsStructureHelper.hasProperties,
			(hasRootProperties) => {
				this._hasRootProperties = hasRootProperties;
				this.#checkDefaultTabName();
			},
			'observeRootProperties',
		);

[AndyButland]

This looks to be working as expected from my testing @nielslyngsoe. There are a few Copilot comments you should review though, and some debug logging that should be cleaned-up.