[bug] fix(widgets): `LoadingDots` label and dot animation overflow narrow container widths

[itssagarK]

Issue Description

### Title
fix(widgets): `LoadingDots` label and dot animation overflow narrow container widths

### Description
In `packages/widgets/src/feedback/LoadingDots.ts`, `_renderSelf` writes `this._label` and dot

strings directly to the screen buffer without bounding them to width. When placed in a narrow
container, long labels or dot strings overflow the content rectangle.

### Expected Behavior
`LoadingDots` should truncate label and dot strings to fit within `width`.

GSSoC contributor?

• Yes. You contribute under GSSoC 2026.
• No.

[github-actions]

✅ Auto-assigned to @itssagarK (issue opener).

Open your PR by 2026-08-01 (7 days). The bot frees this issue for another contributor after that date.

Reminders:

• ⭐ Star the repo first. The star-check job blocks your merge otherwise.
• PR title: type: short description
• Link this issue in your PR body: Closes #3063

Good luck. 🚀

[github-actions]

⏰ Auto-unassigned: no PR opened within 7 days.

@itssagarK, re-claim it by commenting I would like to work on this again.

Other contributors can now pick this up.