Fix causal footer and gutter posture

[flyingrobots]

Summary

• make footer posture report observed causal ticks instead of mixing historical observation with live head ticks
• order opened-buffer durability as pending intent, checkpoint/export, Echo receipt, then local dirty projection
• restore muted gutter line-number hierarchy and harden light/generated companion theme contrast

Verification

• npm run check

Notes

Follow-up to the dogfooding issues raised around causal footer posture, gutter theming, and unreadable light-theme text.

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: bb11d29f-aece-44d9-ba11-758d9e8dec66

📥 Commits

Reviewing files that changed from the base of the PR and between e93b2e1 and 223579c.

⛔ Files ignored due to path filters (2)

• docs/topics/ui/editor-chrome.svg is excluded by !**/*.svg
• docs/topics/ui/overview.svg is excluded by !**/*.svg

📒 Files selected for processing (18)

• docs/design/0147-unmaterialized-file-frontier.md
• docs/topics/ui/README.md
• docs/topics/ui/editor-chrome.md
• spec/source-viewer.spec.mjs
• spec/theme-switch.spec.mjs
• spec/workspace-app-echo-cutover.spec.mjs
• spec/workspace-command-line.spec.mjs
• spec/workspace-footer.spec.mjs
• spec/workspace-text-boundaries.spec.mjs
• spec/workspace-worldline-ux.spec.mjs
• src/app/workspace/workspace-footer-posture.ts
• src/app/workspace/worldline-graph.ts
• src/app/workspace/worldline-phase-view.ts
• src/app/workspace/worldline-tick-span.ts
• src/ui/jedit-theme-palettes.ts
• src/ui/jedit-themes.ts
• src/ui/source-viewer.ts
• src/ui/workspace-footer-surface-utils.ts

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Widen the span column to preserve tick ranges

When a node has different basis/head ticks, workspaceWorldlineTickSpanLabel(node) can return labels like ticks:t0->t10 (13 characters), but this new column is capped at 9 characters and cell(row.span, SPAN_CELL_WIDTH) truncates it before the drawer is fit to the terminal. In any history with a multi-digit canonical tick or a braid spanning from an older basis to a later head, the phase drawer drops the head tick from the causal span, making the displayed posture inaccurate even on wide terminals.

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