Confusing blocking behavior and incorrect guidance from ask question tool

Confusing blocking behavior and incorrect guidance from ask question tool related to planning

- pretty sure I was not even in plan mode when I sent the initial request - so confusing that it claimed I was
- edits do sometimes get made while in plan mode from my experience, and if not, it'll usually just create a plan for making those edits. so confusing this was surfaced as a blocker at all
- switching modes in the middle of a session, esp with an active question open like this is not possible
- shift+tab shortcut for switching modes is also outdated for ghcp app - although it may still the case for CLI

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| Field | Value |
| --- | --- |
| App version | 1.0.25 |
| OS | Windows 10.0.26100 |
| Theme | GitHub |
| Path | /chat |
| Tenure | Week 13 |

まず、Windows 上のアプリバージョン 1.0.25 で /chat パスにおいて報告された動作を再現し、planning-mode のガイダンス、編集、アクティブな質問、モード切り替えを確認します。shift+tab ショートカットを含め、表示される指示と実際の動作を比較します。ガイダンスとブロック状態が、現在のアプリの動作とサポートされているモード切り替えを正確に反映していれば完了です。

索引モデルが issue の本文から書いたものです。