feat(t-deck): Add methods / tests for getting current rotated display size, use it to update display when it rotates in example

[finger563]

Description

• Add methods for getting the rotated display width/height
• Update example to use the methods and ensure they work

Motivation and Context

Provides additional methods for getting the rotated display size, not just the lvgl methods.

How has this been tested?

Build and run t-deck/example on t-deck and ensure as the screen is rotated the background / display is correct.

Screenshots (if appropriate, e.g. schematic, board, console logs, lab pictures):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update
• Hardware (schematic, board, system design) change
• Software change

Checklist:

• My change requires a change to the documentation.
• I have added / updated the documentation related to this change via either README or WIKI

Software

• I have added tests to cover my changes.
• I have updated the .github/workflows/build.yml file to add my new test to the automated cloud build github action.
• All new and existing tests passed.
• My code follows the code style of this project.

[Copilot]

Pull Request Overview

This PR adds functionality to retrieve the current rotated display dimensions for the T-Deck component. When the display rotates, the example code now correctly updates the background object size to match the new orientation.

Key Changes:

• Added rotated_display_width() and rotated_display_height() methods that return dimensions based on current rotation
• Refactored display rotation logic into a reusable rotate_display lambda function
• Updated background object size on rotation to match the rotated display dimensions

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
components/t-deck/src/t-deck.cpp	Implements the rotated display dimension methods with switch statements handling all rotation cases
components/t-deck/include/t-deck.hpp	Declares new static and instance methods for getting display dimensions
components/t-deck/example/main/t_deck_example.cpp	Refactors rotation logic into lambda and updates background size using new rotated dimension methods

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[github-actions]

✅Static analysis result - no issues found! ✅