revert: add response-only metadata fields to image elements and blocks (#57)

[StephenTangCook]

Summary

Reverts #57 per request. Removes the response-only image metadata fields that #57 added to the image_block and image_element schema $defs: image_width, image_height, image_bytes, is_animated (block only), and fallback.

Note: #57 was merged but never released — the tree is still 0.1.10, because that PR's squash subject lacked a Conventional Commits prefix and release-please never cut a version. So no published package ever shipped these fields; this simply backs the change out of main.

Type of change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing behavior to change)
• Schema update (changes to src/slack-block-kit.schema.json) — revert
• Docs / chore (no runtime change)

Changes

• Revert src/slack-block-kit.schema.json: image_block / image_element back to their pre-Add response-only metadata fields to image elements and blocks #57 property sets (drops the 5 / 4 response-only fields).
• Regenerate src/types.generated.ts from the schema (removes the corresponding optional properties).
• Remove the tests added in Add response-only metadata fields to image elements and blocks #57 (test/blocks.test.ts, test/block-elements.test.ts).

Testing

• pnpm test passes (493 tests)
• pnpm typecheck passes
• pnpm lint passes
• pnpm validate-schema passes
• Generated types verified in sync with the schema

Schema changes

• Verified against the Slack Block Kit reference
• Backwards compatible — reverts to the previously-shipped 0.1.10 schema; existing valid payloads still validate. (Trade-off: image blocks pulled straight from Slack's Web API responses will again report these response-only fields as unknown property.)
• If breaking, called out in the summary and a release note is planned

Checklist

• Commit messages follow Conventional Commits (required for release-please)
• Public API changes are reflected in README.md (no README changes were made in Add response-only metadata fields to image elements and blocks #57)
• No secrets, tokens, or sample tenant data committed

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