Standardize Embedded Wallets dashboard terminology across docs

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Summary

Standardize references to the Embedded Wallets project dashboard across documentation to use a single canonical term: Embedded Wallets dashboard.

Problem

The docs currently use multiple labels for the same dashboard experience, including:

• "Web3Auth dashboard"
• "Web3Auth Developer Dashboard"
• "Embedded Wallets dashboard"

This inconsistency creates confusion for readers and complicates editorial review.

Proposed standard

Use Embedded Wallets dashboard as the default term in user-facing docs.

Scope

• Audit all Embedded Wallets docs and quickstarts for dashboard references.
• Replace non-standard variants with Embedded Wallets dashboard where context is end-user instructional content.
• Preserve legacy names only when required for historical migration context, with explicit clarification.
• Align CTA/button copy and link text where needed.

Acceptance criteria

• No remaining user-facing references to "Web3Auth dashboard" in Embedded Wallets docs unless intentionally preserved with rationale.
• A brief style note is added or updated in the relevant docs rules/style guidance for canonical naming.
• Vale/style checks pass after updates.