add multi-email input component and refactor compose email form

[yashsharma999]

closes #368

https://www.loom.com/share/641f7db9d9294edabfecbcc1c8180810?sid=20501053-759b-4b2f-93a8-09bf24e9bf4e

Summary by CodeRabbit

• New Features
  • Enhanced the email composition interface with improved recipient fields.
  • Introduced a dynamic mailbox component that provides toggling options for additional fields like Cc and Bcc.
  • Added support for managing multiple email addresses with robust validation and formatting improvements.
  • Updated form behavior to consistently handle recipient inputs, ensuring a smoother email composition experience.

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Walkthrough

This PR updates the email composition functionality. In the ComposeEmailForm, default values for cc and bcc are set to empty strings, and the form’s onSubmit logic now converts email fields from arrays to comma-separated strings. The old email input is replaced by a new ComposeMailBox component, which manages the display of additional fields via toggle buttons. Additionally, a new MultiEmailInput component is introduced to handle multiple email entries with regex validation and state management for form registration.

Changes

File(s)	Change Summary
…/compose/ComposeEmailForm.tsx	Updated default values for cc and bcc; revised onSubmit logic to convert email arrays to comma-separated strings; reintroduced SendEmailBody type; replaced the traditional <Input> with the ComposeMailBox component.
…/compose/ComposeMailBox.tsx, …/compose/MultiEmailInput.tsx	Added new components: ComposeMailBox (along with ToggleButtonsWrapper and ToggleButton) enables dynamic Cc/Bcc handling. MultiEmailInput provides multi-email entry, regex validation, state management, and integration with form registration.

Sequence Diagram(s)

sequenceDiagram
    participant User as User
    participant Form as ComposeEmailForm
    participant MailBox as ComposeMailBox
    participant Server as Server

    User->>Form: Enter email details (to, cc, bcc)
    Form->>MailBox: Render email input fields with toggles for Cc/Bcc
    User->>MailBox: Toggle Cc/Bcc fields as needed
    MailBox->>MailBox: Update internal display state
    User->>Form: Submit form
    Form->>Form: Convert email arrays to comma-separated strings
    Form->>Server: Send processed email data

sequenceDiagram
    participant User as User
    participant MEI as MultiEmailInput
    participant Reg as Form Registration

    User->>MEI: Type email address(es)
    MEI->>MEI: Validate emails using regex and update state
    MEI->>Reg: Pass comma-separated email values for form submission

Assessment against linked issues

Objective	Addressed	Explanation
Update multi input on compose form (#368)	✅

Possibly related PRs

• elie222/inbox-zero#220: Involved adjustments to the ComposeEmailForm.tsx, focusing on email input handling, which relates to the changes in this PR.

Poem

I'm a rabbit hopping in the code glade,
Where email forms bloom in a cascade.
With toggles and inputs, I bound along,
Crafting code in a harmonious song.
Hoppy changes make my heart skip a beat!
🐇✨

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apps/web/app/(app)/compose/ComposeEmailForm.tsx

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apps/web/app/(app)/compose/MultiEmailInput.tsx

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apps/web/app/(app)/compose/ComposeMailBox.tsx

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