chore(ui): style updates part1

[andrewrisse]

Description

Completes these items from issue #690. The rest of the items will be done in a 2nd PR:

• Persist error notifications until closed manually Design: Chat
• Move + icon on New Chat button to right of button and text to left and icon to right Design: Chat
• Reduce left padding in left panel for both the menu and submenu items. Ideally all the Button text (New Chat, Import..., Export...) and menu item text all align down the panel and then the submenu item text is indented 1rem (16px) from that. Design: Chat
• Remove top padding between the menu item text and associated submenu text. Leave the bottom padding Design: Chat
• Only show 3 dot menu on chat thread list on hover Design: Chat - 3 Dot Menu
• Can we move the 3 dot menu into the button instead of to the right? Design: Chat - 3 Dot Menu
• Change 3 dot menu style to look like a dropdown list Design: Chat - 3 Dot Menu
• Change Import/Export chat history buttons to "Alternate" style Design: Chat
• Move Assistant drop down to left of Prompt message input field Design: Chat
• Change style of assistant drop down to match prompt input (Does the input have an outline by default?) Design: Chat
• Change Assistant dropdown menu to match Figma design Design: Chat - Assistants Dropdown
• Change the "None" selection to "No Assistant" Design: Chat - Assistants Dropdown
• Change send icon in prompt input to be an up arrow Design: Chat
• Change color of file and send icon in prompt input to match place holder text (gray-400) Design: Chat
• Create hover color of file and send icon in prompt input and set to gray-300

Related Issue

#690

Closes #690

Checklist before merging

• Tests, documentation, ADR added or updated as needed
• Followed the Contributor Guide Steps

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[gregclark-defenseunicorns]

Design Review passed