fix: preserve composer drafts during pending user input

[Githubguy132010]

What Changed

• keep the main composer draft separate from pending custom-answer text while a plan-mode user-input request is active
• route contenteditable edits and mention replacements to the active pending answer without overwriting the main draft
• simplify digit-key handling for pending input choices and add browser coverage for draft preservation

Why

Pending custom answers were reusing the main composer state, which caused the user's normal draft to be replaced while answering follow-up questions. This change isolates those two editing flows so plan-mode responses remain predictable and the original draft is restored afterward.

Screenshots

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

Note

Preserve composer drafts during pending user input in ChatView

• Adds resolveComposerDraftText in ChatView.logic.ts to select between a pending custom answer and the main prompt as the visible composer value.
• Updates ChatView.tsx to display and edit the pending custom answer in the composer while keeping the main prompt draft intact, restoring it once the pending input is cleared.
• Routes send/emptiness checks and applyPromptReplacement through the active visible value so edits target the correct state (custom answer vs. main prompt).
• Adds an integration test in ChatView.browser.tsx verifying draft preservation, custom answer routing, and draft restoration across snapshot changes.
• Behavioral Change: onPromptChange and readComposerSnapshot now route mutations to either the custom answer state or the main prompt store depending on whether a pending user input is active.

^{Macroscope summarized 49a1884.}

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