Screen-reader does not echo the characters I type on github copilot terminal

### Describe the bug

##Read back / edit what I type in the prompt

**What I need:** As I type in the Copilot prompt, my screen reader must echo the characters I type, and
let me review/correct/edit the input. Today I can't reliably read back what I've typed, so if I mistype
I can't tell, and I can't edit it — which makes composing prompts error‑prone and slow.

**Already‑opened threads to cite / upvote (strong matches):**
- github/copilot-cli#1642 — "Screen reader reads premium requests status bar on every keypress instead
of typed character" (open, `area:theming-accessibility`) — https://github.com/github/copilot-cli/issues/1642
- github/copilot-cli#1573 — "Editing in the CLI" (open) — https://github.com/github/copilot-cli/issues/1573
- github/copilot-cli#201 — "Text cursor not present in input field" (closed) —
https://github.com/github/copilot-cli/issues/201

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### Affected version

_No response_

### Steps to reproduce the behavior

type something the terminal and try to read with left and right arrow keys, characters are either not read or read incorrectly

### Expected behavior

**Expected behavior:**
- Typing `a` → screen reader says "a".
- The input line has proper focus so character echo reaches the screen reader first.
- Standard line‑editing (move by char/word, backspace, review) is fully readable.

### Additional context

_No response_

No implementation file or test is named. Reproduce the issue in the Copilot CLI terminal with a screen reader, then trace the prompt's input and line-editing entry point; done means typed characters, cursor movement, backspace, review, and correction are reliably announced.

索引モデルが issue の本文から書いたものです。