fix: phone field on Edit Proposal dialog

[harshtandiya]

Problem

ProposalEditDialog.vue renders the phone field as a plain FormControl type="tel" and saves the raw string via frappe.client.set_value:

• No dial-code handling. The rest of the dashboard uses PhoneInput.vue (Combobox dial code + number, @/utils/phone formatPhone/parsePhone), which produces the {isd}-{number} format the backend expects.
• A value saved without the isd- prefix renders blank in Desk's Phone field UI (same class of bug as Phone field prepends a duplicate "+91 +91" prefix, causing "Invalid Phone Number" on save #244).
• Existing hyphen-formatted values (e.g. 91-9876543210) show up in the dialog as-is in a plain text box — editing them casually corrupts the format.

Fix

Swap the plain FormControl in ProposalEditDialog.vue for the shared PhoneInput component so dial code and number are edited separately and saved as {isd}-{number}.

Relevant files:

• dashboard/src/components/ProposalEditDialog.vue (phone FormControl, save via updateResource.submit)
• dashboard/src/components/PhoneInput.vue (existing shared component)
• dashboard/src/utils/phone.ts

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