Migrate React surfaces to React Compiler

[bholmesdev]

Description

Migrates the desktop app, web app, and shared UI package to React Compiler.

• Removes unnecessary manual memoization across React surfaces.
• Adds compiler compatibility fixes for editor, sidebar, terminal, search, and link workflows.
• Audits real production builds for compiler skips and zero compiler output.
• Fixes navigation-history button flicker and preserves pending edits across file changes.
• Adds structured local PR review guidance.

Related issue: none.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Documentation update

Testing

• Existing tests pass
• Added new tests for changes
• Tested manually (describe below)

Manual Testing Details:

Desktop E2E covered sidebar expansion, back/forward history, search, rich/source editing, Find/Format, wiki popovers, terminal, and iframe flows. Web runtime verification was explicitly waived.

Automated validation:

• pnpm build:desktop
• pnpm check
• pnpm test (228 tests)
• pnpm check:react-compiler (109 compiled, zero failures)

Checklist

• I discussed this change in a GitHub issue before submitting this PR
• I have run the linter, formatter, and tests to ensure my code is ready for review

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Project	Deployment	Actions	Updated (UTC)
hubble-md-web	Ready	Preview, Comment	Jul 12, 2026 2:46am