feat(utils): add DOM utilities

[maitamdev]

DOM helpers: viewport check, clipboard, scroll percentage.

---

Summary by cubic

Add a DOM utilities module with helpers for viewport checks, clipboard copy with a textarea fallback, and scroll percentage calculation. This centralizes common DOM logic for reuse in UI components.

^{Written for commit 4613b7f. Summary will update on new commits.}

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Project	Deployment	Actions	Updated (UTC)
dhv-guiding-light	Building	Preview, Comment	Mar 4, 2026 7:20pm

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⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 129356e8-2c2d-4c3e-80ee-52b7e162beae

📥 Commits

Reviewing files that changed from the base of the PR and between 153dc05 and 4613b7f.

📒 Files selected for processing (1)

• src/utils/domUtils.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/dom-utils

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[cubic-dev-ai]

1 issue found across 1 file

Prompt for AI agents (unresolved issues)

Check if these issues are valid — if so, understand the root cause of each and fix them. If appropriate, use sub-agents to investigate and fix each issue separately.


<file name="src/utils/domUtils.ts">

<violation number="1" location="src/utils/domUtils.ts:14">
P2: The clipboard fallback always resolves even when copy fails, masking runtime failures and breaking error handling for callers.</violation>
</file>

_{Reply with feedback, questions, or to request a fix. Tag @cubic-dev-ai to re-run a review.}

[cubic-dev-ai]

P2: The clipboard fallback always resolves even when copy fails, masking runtime failures and breaking error handling for callers.

Prompt for AI agents

Check if this issue is valid — if so, understand the root cause and fix it. At src/utils/domUtils.ts, line 14:

<comment>The clipboard fallback always resolves even when copy fails, masking runtime failures and breaking error handling for callers.</comment>

<file context>
@@ -0,0 +1,24 @@
+  textarea.style.opacity = '0';
+  document.body.appendChild(textarea);
+  textarea.select();
+  document.execCommand('copy');
+  document.body.removeChild(textarea);
+  return Promise.resolve();
</file context>