Migration fix for settings.providers

[kliu57]

Closes #536

Code changes:

Part 1 - Changing settings.providers to use name as the key

Files:
src/components/Message/AppMessage/Instructions.tsx
src/components/PreferencesModal.tsx
src/lib/settings.ts

Part 2 - Deserializing settings.providers in settings.ts

To test this you can set your settings json to the following (replace YOUR_OPENAI_KEY with your key). Using my json you start with two openai providers and two openrouter providers and after navigating to or refreshing chatcraft the deserializer will change it to having two.

{"model":"openai/gpt-3.5-turbo","temperature":0,"enterBehaviour":"send","countTokens":false,"sidebarVisible":false,"alwaysSendFunctionResult":false,"textToSpeech":{"announceMessages":false,"voice":"alloy"},"providers":{"OpenAI":{"id":"Jnc3KkY4--dQm7KwMWy7Y","name":"OpenAI","apiUrl":"https://api.openai.com/v1","apiKey":"aaaaaaaa"},"OpenRouter.ai":{"id":"XG_lpq_xG-nMIbD1ZRCG-","name":"OpenRouter.ai","apiUrl":"https://openrouter.ai/api/v1","apiKey":"bbbbbbbb"},"https://api.openai.com/v1":{"id":"Jnc3KkY4--dQm7KwMWy7Y","name":"OpenAI","apiUrl":"https://api.openai.com/v1","apiKey":"YOUR_OPENAI_KEY"},"https://openrouter.ai/api/v1":{"id":"XG_lpq_xG-nMIbD1ZRCG-","name":"OpenRouter.ai","apiUrl":"https://openrouter.ai/api/v1","apiKey":"YOUR_OPENROUTER_KEY"}},"currentProvider":{"id":"XG_lpq_xG-nMIbD1ZRCG-","name":"OpenRouter.ai","apiUrl":"https://openrouter.ai/api/v1","apiKey":"YOUR_OPENROUTER_KEY"},"compressionFactor":1,"maxCompressedFileSizeMB":20,"maxImageDimension":2048}

Part 3 - Removing unnecessary calls to getSettings() in useEffects to decrease how many times our deserializer runs

As discussed with @Amnish04 already, there are some locations where we can call getSettings() a lesser amount of times.
Files: src/hooks/use-chat-openai.ts, src/lib/ai.ts

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@Rachit1313 If this PR is merged to main before your PR#535, then I need you to merge the code from main into your branch and then modify your code to use the name as the key instead of the apiUrl as the key whenever you access settings.providers

[kliu57]

@humphd This is the hotfix I was talking to you about on discord. I would like to get this merged as soon as possible since both I and Rachit will need to do minor code changes to our PRs following this.