ci: add ignore rule for playground/** dependabot updates

[RYGRIT]

Follow-up to #108.

After #108, Dependabot was still opening security update PRs for playground/yarn.

exclude-paths only prevents version updates. It does not block security updates, so playground/yarn still needed a dedicated ignore rule.

This change adds that ignore configuration so updates under playground/yarn no longer create Dependabot PRs.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: e746d862-26b3-46f3-829e-45f52c2c8a84

📥 Commits

Reviewing files that changed from the base of the PR and between f041222 and 6823a6d.

📒 Files selected for processing (1)

• .github/dependabot.yml

📝 Walkthrough

Walkthrough

The PR modifies the Dependabot configuration file to clarify and strengthen dependency management for the playground directory. It updates the comment for the root npm ecosystem to explicitly state that exclude-paths blocks only version updates, not security updates. Additionally, it introduces a new Dependabot updates entry for npm targeting playground/** with a weekly schedule and an ignore rule that prevents all dependencies in that directory from being updated, including security updates.

Possibly related PRs

• ci: exclude playground directory #105: Modifies .github/dependabot.yml to exclude the playground directory from Dependabot updates using a different approach for the github-actions ecosystem.
• ci(dependabot): apply playground exclusions to npm updates #108: Modifies .github/dependabot.yml to apply playground/** exclusions for npm dependency updates, directly addressing the same configuration target as this PR.

🚥 Pre-merge checks | ✅ 1

✅ Passed checks (1 passed)

Check name	Status	Explanation
Description check	✅ Passed	The pull request description clearly relates to the changeset, explaining the rationale for adding an ignore rule to prevent Dependabot from opening security update PRs for playground/**.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

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[coderabbitai]

🧹 Nitpick comments (1)

.github/dependabot.yml (1)

22-25: Optional: consider interval: monthly for the ignore-only block.

Since every dependency here is ignored, the weekly schedule only drives background checks that can never produce PRs. Dropping it to monthly reduces wasted Dependabot runs without changing behaviour.

♻️ Proposed tweak

     schedule:
-      interval: weekly
+      interval: monthly
     ignore:
       - dependency-name: "*"

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 60f976a4-b409-4f87-8ce8-e34163e9168f

📥 Commits

Reviewing files that changed from the base of the PR and between 2c59477 and f041222.

📒 Files selected for processing (1)

• .github/dependabot.yml