refactor(writers): split the shared helper module into cohesive submodules

[mfkrause]

Summary

The 2,622-line writers' common.rs becomes a common/ tree of nine cohesive submodules re-exported through mod.rs — pure code motion with zero consumer churn and no output change. The redundant per-item feature gates are replaced by one policy per module: a module-level cfg where the consumers form a single feature family (table_layout), and a module-level allow(dead_code) for the cross-cutting toolboxes.

Related issues

None.

Checklist

• I have read CONTRIBUTING.md and followed its rules.
• All checks and tests pass locally.
• I added or updated tests for the change, if needed.
• If this changes support for a format or extension, I updated README.md and/or docs/STATUS.md.
• My commits follow Conventional Commits — the changelog is generated from them, so no manual CHANGELOG.md edit is needed.

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: 27b2754e-8d1d-4515-a7ea-d8717f624ac5

📥 Commits

Reviewing files that changed from the base of the PR and between e880bef and c30b56e.

📒 Files selected for processing (11)

• crates/carta-writers/src/common.rs
• crates/carta-writers/src/common/dimensions.rs
• crates/carta-writers/src/common/fill.rs
• crates/carta-writers/src/common/html_attr.rs
• crates/carta-writers/src/common/lists.rs
• crates/carta-writers/src/common/mod.rs
• crates/carta-writers/src/common/notes.rs
• crates/carta-writers/src/common/table_layout.rs
• crates/carta-writers/src/common/tables.rs
• crates/carta-writers/src/common/uri.rs
• crates/carta-writers/src/common/width.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch refactor/split-writers-common

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