feat(ai_assistant): add ask doubt chat experience

[Gowreesh-A-M]

• add the Ask Doubt route from the AI Assistant hub with a dedicated chat screen
• build localized chat UI with empty state, composer, history drawer, overlays, and message bubbles
• add Riverpod session state for chats, pinning, renaming, deletion, mock replies, and image placeholder messages
• update shared l10n strings and core surfaces used by the Ask Doubt experience

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request delivers the foundational 'Ask Doubt' chat experience for the AI Assistant. It provides students with a dedicated, interactive interface to engage with an AI study assistant, complete with a localized and visually consistent chat UI. The implementation focuses on a smooth user flow, from initial navigation and quick suggestions to managing chat history and handling various message types, all backed by a robust state management system.

Highlights

• New Ask Doubt Chat Experience: Introduced a dedicated chat screen for the 'Ask Doubt' feature within the AI Assistant hub, providing a focused environment for student inquiries.
• Localized Chat UI Components: Implemented a comprehensive chat user interface including an empty state with quick suggestions, a floating composer, a history drawer for past sessions, and distinct message bubbles for user and AI responses, all fully localized.
• Riverpod State Management: Integrated Riverpod for robust session state management, enabling features such as pinning, renaming, and deleting chat sessions, as well as handling mock replies and image placeholder messages.
• Core UI and Localization Updates: Updated shared localization strings and core UI components (AppCard, AppHeader) to support the new Ask Doubt experience, ensuring consistent design and accessibility.

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[gemini-code-assist]

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[Gowreesh-A-M]

/gemini review

[gemini-code-assist]

Code Review

This pull request introduces the 'Ask Doubt' feature, a complete chat experience within the AI Assistant. The changes are extensive, including new screens, widgets, state management with Riverpod, and localization strings. The implementation is well-structured, with clear separation of concerns into different widgets and providers. I've identified a few issues: a potential race condition in the state provider when handling async responses, a memory leak due to improper FocusNode management, and a need for more robust unique ID generation. I've also pointed out some missing translations. Overall, this is a solid implementation of a complex feature.