Upgrade @wordpress packages and @types/wordpress__block-editor to WP 6.9

[jessicamgoddard]

Summary

• Updates all @wordpress/* packages to the versions shipped with WordPress 6.9 (per npm's wp-6.9 dist-tag), and bumps the packages-update script's --dist-tag to match.
• Removes the pinned @types/wordpress__block-editor (11.5.x) and @types/wordpress__edit-post, and reinstalls @types/wordpress__block-editor at its current (15.x) version. @types/wordpress__blocks is no longer needed since @wordpress/blocks now ships its own type declarations.
• Fixes the resulting tsc errors across blocks/post/edit.tsx, blocks/query/edit.tsx, components/PatternSelectionModal/index.tsx, and services/deduplicate/index.ts, bridging the official @wordpress/blocks Block type to this repo's simpler local Block type (types/block.ts) where needed.
• Along the way, fixes two real bugs the stricter types caught:
  • services/deduplicate/index.ts: getBlocks() was being passed an array of client IDs (root) instead of a single client ID (root[0]) — the block-editor API expects a single rootClientId string.
  • components/PatternSelectionModal/index.tsx: a stray import type { BlockInstance } from 'wordpress__blocks' only ever resolved by accident via a transitive @types package; now imports Block as BlockInstance from @wordpress/blocks directly.
• Adds a CHANGELOG.md entry.

Fixes #425.

Test plan

• npm run check-types (tsc) passes
• npm run eslint passes
• npm run stylelint passes
• npm run jest passes
• npm run build completes successfully
• Manual QA in wp-admin: confirm Query/Subquery/Post blocks still edit, pin/backfill posts correctly, and pattern selection still works
  • The one real risk is the getBlocks(root) → getBlocks(root[0]) fix in services/deduplicate/index.ts — that's an actual behavior change (previously passed an array where the WP selector expects a single client ID string), specifically in the "narrow scope to template mode" path when editing a single core/post-content block. It's very likely a correct bug fix, but I haven't manually verified it in the block editor (site editor / template editing with pinned + backfilled posts) — only tsc/eslint/stylelint/jest ran clean, and jest coverage here is thin (4 unrelated tests). I'd flag that as the one thing worth a real editor smoke-test before merging, which is already called out as unchecked in the PR's test plan.

🤖 Generated with Claude Code

[Copilot]

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Copilot review overview

Review effort: Lite
Findings: 1 · 2

Open (3)

• getBlocksByName('core/post-content') returns block objects (not clientId strings). Passing… · New
• This test encodes getBlocksByName() as returning a string clientId array, but the block-editor… · New
• The shared types/block.ts now depends on a block implementation module (../blocks/query/types),… · New

What changed in this PR

Updates the project to WordPress 6.9-aligned @wordpress/* packages and newer block-editor typings, then adjusts the codebase to satisfy stricter TypeScript types (including adding typed selector wrappers).

Changes:

• Bumps @wordpress/* dependencies (and packages-update dist-tag) to WP 6.9 versions; updates @types/wordpress__block-editor.
• Adds typed core/block-editor selector wrappers and replaces several untyped selector usages.
• Adjusts local Block typing and fixes deduplication/type issues; adds a small Jest test for the dedupe root-selection behavior.

File	Description
types/​block.ts	Expands local Block attribute typing (nullable posts, terms/supportsPostTypes).
services/​deduplicate/​index.ts	Uses typed selector wrappers and changes root scoping logic for template mode.
services/​deduplicate/​index.test.ts	Adds tests covering dedupe’s “post-content root” scoping behavior.
services/​blockEditorSelectors/​index.ts	Introduces typed wrapper helpers around block-editor selectors.
package.json	Updates WP package versions and packages-update dist-tag to wp-6.9.
components/​PatternSelectionModal/​index.tsx	Switches to @wordpress/blocks for Block typing.
blocks/​query/​edit.tsx	Uses new typed selector helper; hardens nullability around innerBlocks.
blocks/​post/​edit.tsx	Uses typed block selector wrapper; tweaks guards for drag/drop behavior.
CHANGELOG.md	Notes dependency/type upgrades under “Unreleased”.

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[jessicamgoddard]

@copilot services/deduplicate/index.ts:136 already passes the right thing. The selector's own docs in node_modules/@wordpress/block-editor say it returns "Array of clientIds", and @types/wordpress__block-editor types it as string[]. The code and the string-array mock in the test are both correct, and "fixing" it to root[0].clientId would break dedupe.