Scheduler Timeline Demo: Update UI Texts

[arman-boyakhchyan]

No description provided.

[Copilot]

Pull request overview

This PR updates the Scheduler “Timelines” demo UI across frameworks to make the options panel clearer and more consistent, while simplifying the “snapToCellsMode” selector data.

Changes:

• Adds an “Options” caption and renames the label from “Snap to Cells Mode” to “Snap to Grid”.
• Simplifies SelectBox items for snapToCellsMode from { value, text } objects to primitive string arrays (and removes valueExpr / displayExpr where applicable).
• Adjusts demo styling by adding a caption style and forcing appointment content text color to white.

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
apps/demos/Demos/Scheduler/Timelines/Vue/App.vue	Updates options UI text/caption, simplifies SelectBox items, and adds related styles.
apps/demos/Demos/Scheduler/Timelines/ReactJs/App.js	Simplifies SelectBox items and updates options UI text/caption.
apps/demos/Demos/Scheduler/Timelines/ReactJs/styles.css	Adds caption styling and appointment content text color override.
apps/demos/Demos/Scheduler/Timelines/React/App.tsx	Simplifies SelectBox items (typed) and updates options UI text/caption.
apps/demos/Demos/Scheduler/Timelines/React/styles.css	Adds caption styling and appointment content text color override.
apps/demos/Demos/Scheduler/Timelines/jQuery/index.js	Simplifies dxSelectBox items and removes value/display expr mapping.
apps/demos/Demos/Scheduler/Timelines/jQuery/index.html	Updates options UI text/caption in markup.
apps/demos/Demos/Scheduler/Timelines/jQuery/styles.css	Adds caption styling and appointment content text color override.
apps/demos/Demos/Scheduler/Timelines/Angular/app/app.component.ts	Simplifies snapToCellsModeItems to typed primitive array.
apps/demos/Demos/Scheduler/Timelines/Angular/app/app.component.html	Updates options UI text/caption and removes value/display expr mapping.
apps/demos/Demos/Scheduler/Timelines/Angular/app/app.component.css	Adds caption styling and appointment content text color override (via ::ng-deep).

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