feat: add standard client headers

[grdsdev]

What kind of change does this PR introduce?

Bug fix, feature, docs update, ...

What is the current behavior?

Please link any relevant issues here.

What is the new behavior?

Feel free to include screenshots if it includes visual changes.

Additional context

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[linear]

CLIBS-117 [supabase-swift] Send standard client headers on all requests

[coveralls]

Pull Request Test Coverage Report for Build 13698748167

Details

• 25 of 31 (80.65%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.004%) to 74.835%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
Sources/Helpers/Version.swift	0	6	0.0%

Totals
Change from base Build 13696472420:	0.004%
Covered Lines:	5100
Relevant Lines:	6815

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 14795739369

Details

• 25 of 37 (67.57%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.5%) to 75.329%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
Sources/Helpers/Version.swift	0	12	0.0%

Totals
Change from base Build 14792307257:	0.5%
Covered Lines:	5154
Relevant Lines:	6842

---

💛 - Coveralls

[Copilot]

Pull Request Overview

This PR introduces standard client headers to the Supabase client and updates the related test assets. Key changes include:

• Refactoring header initialization in SupabaseClient to use defaultHeaders.
• Adding new client header values for platform and platform version.
• Updating tests to assert the new header structure using inline snapshots.

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
Tests/SupabaseTests/SupabaseClientTests.swift	Updated tests to validate the new header values with snapshots.
Sources/Supabase/SupabaseClient.swift	Refactored header setup to merge default and custom headers.
Sources/Supabase/Constants.swift	Added a defaultHeaders closure generating standard headers.
Sources/Helpers/Version.swift	Updated version and platform logic using new Swift patterns.
Package.swift	Added InlineSnapshotTesting dependency for enhanced snapshot tests.

Comments suppressed due to low confidence (2)

Sources/Supabase/SupabaseClient.swift:163

• [nitpick] Consider extracting the headers merging logic into a helper function to improve readability and ease future maintenance.

_headers = HTTPFields(defaultHeaders).merging(with: HTTPFields([...]))

Tests/SupabaseTests/SupabaseClientTests.swift:67

• [nitpick] The inline snapshot contains hard-coded header values; be aware that any future changes to header generation logic may require updating this snapshot to avoid false negatives.

assertInlineSnapshot(of: client.headers, as: .customDump) {