FEAT: rename Monitor to Sessions and clarify Session Totals

[merefield]

Why

The former Monitor tab now supports inspecting and interacting with Codex sessions, not just watching token activity. Sessions is a compact, clearer tab name, while SESSION TOTALS describes the aggregate readout without implying it belongs to a single selected session.

Changes

• Rename the visible Monitor tab and view name to Sessions.
• Rename MONITOR READOUT to SESSION TOTALS.
• Use SES / S in compact tab labels, preserving the activity indicator and responsive click geometry.
• Update the four affected localisation keys in all 17 locale catalogues; remove the superseded branding keys.
• Update README and intro-post terminology while retaining the session command-centre positioning and existing interaction guidance.
• Keep internal identifiers and the saved mainTab: "monitor" preference stable, so existing installations restore the renamed tab without a migration.

No shortcuts, session actions, approval behaviour, version number or release process are changed.

Validation

• Full go test ./..., including translated rendering/click-surface checks.
• Targeted race tests for tab navigation and session navigation controls.
• go vet ./... and git diff --check.
• Explicit regression test for the legacy saved tab and responsive Sessions labels.
• English presentation snapshot updated for the intentional label changes.
• Local binary rebuilt for review.

[Copilot]

🟢 Approval recommended

Only minor README wording nits were noted; no blocking issues were identified.

Pull request overview

Renames the user-facing Monitor experience to Sessions while preserving internal identifiers and saved preferences.

Changes:

• Renames tabs and readouts to Sessions and SESSION TOTALS.
• Updates documentation, responsive labels, tests, snapshots, and all locale catalogues.
• Retains existing behavior and legacy preference compatibility.

Two minor README wording nits remain: “The Sessions tab” and “Session previews.”

File summaries

File	Summary
README.md	Updated terminology and usage guidance.
intro-post.md	Updated introductory Sessions terminology.
internal/ui/view_test.go	Updated rendering assertions.
internal/ui/theme.go	Renamed the displayed view label.
internal/ui/tabs.go	Updated responsive tab labels.
internal/ui/tabs_test.go	Tested branding and legacy preferences.
internal/ui/monitor.go	Renamed the totals readout.
internal/ui/monitor_test.go	Updated readout assertions.
internal/ui/english_snapshot_test.go	Refreshed the presentation snapshot.
internal/i18n/locales/zh-Hans.json	Updated localized labels.
internal/i18n/locales/tr.json	Updated localized labels.
internal/i18n/locales/sv.json	Updated localized labels.
internal/i18n/locales/ru.json	Updated localized labels.
internal/i18n/locales/pt-PT.json	Updated localized labels.
internal/i18n/locales/pt-BR.json	Updated localized labels.
internal/i18n/locales/nl.json	Updated localized labels.
internal/i18n/locales/nb.json	Updated localized labels.
internal/i18n/locales/ja.json	Updated localized labels.
internal/i18n/locales/it.json	Updated localized labels.
internal/i18n/locales/fr.json	Updated localized labels.
internal/i18n/locales/fi.json	Updated localized labels.
internal/i18n/locales/et.json	Updated localized labels.
internal/i18n/locales/es.json	Updated localized labels.
internal/i18n/locales/en-GB.json	Updated English labels.
internal/i18n/locales/de.json	Updated localized labels.
internal/i18n/locales/da.json	Updated localized labels.

Review details

Suppressed comments (1)

README.md:31

• “Sessions previews” reads as an incorrect plural modifier here; these are previews of individual sessions. Use “Session previews” (or “previews in Sessions”) for the intended meaning.

and the Usage history tab are read-only and do not start model turns. Sessions

• Files reviewed: 26/26 changed files
• Comments generated: 1
• Review effort level: Lite

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