accessibility: add aria-live region announcements for camera view preset changes

[SourabhX16]

Problem Statement

Switching camera view presets (e.g. focusing Earth or switching to SatCam) occurs visually without audio feedback.

Why It Matters

Screen reader users cannot tell when camera perspective has shifted.

Expected Behaviour

Announce camera view target changes in an aria-live='polite' region.

Acceptance Criteria

• Screen reader live region announces camera focus target changes.
• Polite announcement priority set.
• Clear focus target communicated.

Likely Affected Files / Components

• src/components/CameraController.tsx
• src/components/Header.tsx

[mittalsonal]

Hi maintainers, I would like to work on this issue under GSSoC '26.

Proposed Solution

• Inspect the existing camera preset/focus controls in src/components/CameraController.tsx and related header controls.
• Add or reuse a visually hidden aria-live=polite region for camera preset updates.
• Announce clear messages such as the active camera target/preset whenever the user changes views.
• Keep visual behavior unchanged and verify the announcement path for the relevant preset buttons/interactions.

Please assign this to me if it is available.

[SourabhX16]

assigned ' @mittalsonal

[mittalsonal]

Hi @SourabhX16, thank you. I can start this next, but the GitHub assignee field still looks empty on my side. Could you please formally assign this issue to @mittalsonal so I can proceed under the project rules?