fix(a11y): use native form submission paths

[seonghobae]

Outcome

Keyboard and assistive-technology users can submit project and connection creation from focused inputs with Enter through the same guarded path used by button activation. Diagram and canvas search controls are semantic search forms that prevent navigation while preserving live filtering.

Changes

• wrap editor/project-list creation and connection creation in native forms
• use one submit handler per creation action; remove duplicate click dispatch
• preserve whitespace, DSN, secret-clearing, and in-flight request guards
• expose diagram and canvas searches as role="search" forms
• stabilize the async graph-refresh coverage test before enabling fake timers
• document behavior, recovery, standards references, and changelog entry

Test-first evidence

The focused regression initially failed because Enter did not call createProject. After implementation:

• App.coverage.test.tsx: 21 passed
• full frontend suite: 27 files, 201 tests passed
• typecheck: passed
• production build: passed
• coverage run: 27 files, 201 tests passed; App branches 100%
• git diff --check: passed

The repository-wide coverage report remains at its existing aggregate baseline (99.8% statements / 99.55% branches); this change introduces no uncovered App branch.

Closes #756

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Review details

⚙️ Run configuration

Configuration used: Organization UI

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Run ID: 167efded-ad5f-488e-aa63-5c524c4733cf

📥 Commits

Reviewing files that changed from the base of the PR and between 72afe6d and 3d7d948.

📒 Files selected for processing (4)

• CHANGELOG.md
• docs/doctoring/native-form-submission.md
• frontend/src/App.coverage.test.tsx
• frontend/src/App.tsx

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[seonghobae]

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[seonghobae]

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Please perform a fresh independent review of unchanged exact head 3d7d94857f6ba64a73965373b04a6769c55c34a0. All current CI/security workflows are green and no unresolved inline thread is recorded; merge remains deferred until exact-head review evidence is available.

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@seonghobae I will perform a fresh independent review of PR #835 at exact head 3d7d94857f6ba64a73965373b04a6769c55c34a0. I will assess the change independently, including the native form submission paths and accessibility behavior described in the PR objectives.

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Please review exact head 3d7d94857f6ba64a73965373b04a6769c55c34a0. Required ci, Security Scan, and SAST Semgrep workflows are successful and there are no unresolved review threads; no formal review currently exists.

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@seonghobae I will review PR #835 at exact head 3d7d94857f6ba64a73965373b04a6769c55c34a0.

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