Use textdecoder decoding code param payload

[CoveMB]

Title

• Update UTF-8 base64 decoding for code URL param to use TextDecoder; add e2e coverage

Summary

• Replaces ad‑hoc percent-escape base64 decoding with a standards-based TextDecoder approach when loading code from the ?code= URL parameter.
• Adds an e2e test that covers ASCII punctuation, URL-encoded characters, and Unicode (including emoji)

Problem

• Loading code from the code URL param could fail to correctly decode content containing:
  • ASCII punctuation and special URL-encoded characters.
• The prior implementation constructed a percent-escaped string from atob() bytes and then used decodeURIComponent, which is error-prone for arbitrary UTF‑8.

Scope

• libs/remix-ui/workspace/src/lib/actions/workspace.ts: Replace decoder implementation and update usage.
• apps/remix-ide-e2e/src/tests/url.test.ts: Add a new test covering special chars, punctuation, and persistence behavior.

Changes

• Rename and replace decoder:
  • Old: decodePercentEscapedBase64(b64Payload)
  • New: decodeBase64(b64Payload) using TextDecoder('utf-8')
• Updated code path where params.code is processed to use the new decoder.
• Added e2e test “Should load the code from URL & code params with ASCII punctua
  tion and special character #group1” that:
  • Visits Remix with a #code= payload containing special characters and emoji
    .
  • Ensures the decoded content matches expected substrings.
  • Verifies “code-sample” workspace is not persisted after returning to the app
    root.

Implementation Details

• Decoding flow now:
  • decodeURIComponent(b64Payload) → atob() → Uint8Array.from() → new Tex tDecoder().decode(bytes).
• This follows a robust, standards-based UTF‑8 decode path and avoids manual per
  cent-encoding reconstruction.

Backward Compatibility

• No user-facing breaking changes expected.
• Internal function rename from decodePercentEscapedBase64 to decodeBase64 i
  s contained within the same module with its usage updated. No external API chang
  es anticipated.

Note

• The added e2e test was tested on it's own but the test suite is currently disabled
• Wizard side MR: Remix encoding fix OpenZeppelin/contracts-wizard#665

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[CoveMB]

Hello, let me know if the MR need anything else @Aniket-Engg