feat(cc-logs-app-runtime): add collapsible instances panel

[KannarFr]

Context — a suggestion, not a mandate 🙂

I'm coming at this as a user of cc-logs-app-runtime in the console, not as a maintainer of this component. On narrower screens the fixed-width Instances panel eats a lot of horizontal space, and most of the time I just want to read the log stream. So this is a small quality-of-life proposal — very happy for you to take it, tweak it, or close it if it doesn't fit your plans for the component.

What it does

Adds a way to collapse/expand the left Instances panel so the log stream can use the full width:

• A toggle button in the logs header (next to the fullscreen button), using the sidebar-fold / sidebar-unfold Remix icons.
• A keyboard shortcut: Alt+I (I = Instances). I checked the existing shortcuts in cc-logs (Ctrl+C, Ctrl+A, arrows, Home/End, Escape, Space/Enter) — Alt+letter was a free namespace, so no collision.

How it's built (kept minimal + consistent)

• Mirrors the existing fullscreen toggle: internal reactive state (_instancesCollapsed), no new public property, no new event — so no events-map change.
• The collapse simply drives the existing --instances-width custom property to 0, so the "no logs / loading" overlays that already center off that variable stay correct for free.
• Accessibility: the button carries aria-expanded (via a11y-expanded) and a translated a11y-name (EN + FR added), which cc-button also surfaces as the hover title.
• Motion: the width transition is disabled under @media (prefers-reduced-motion).
• The Alt+I handler is element-scoped (@keydown on the component root), matching the existing keyboard-handling approach — no new global listeners. event.code === 'KeyI' is used because Alt/Option mutates event.key on some layouts.
• Documented the shortcut in the component's class JSDoc, same as cc-logs documents its keyboard navigation.

Checks

Ran the CI-gate pieces locally on the touched files: eslint, stylelint, components:check-i18n (EN + FR present), and components:events-map-check (up to date — no new events). Happy to add a collapsed-state story and/or the run-visual-tests label if you'd like that before merging — just say the word.

Open questions for you

• Placement/icon of the toggle OK, or would you prefer it attached to the panel's own header?
• Should the collapsed state be persisted (the console already stores date-range/options via its SettingManager)? I left it ephemeral to keep the change small, but I can wire a public property/event if you want the console to remember it.

🤖 Generated with Claude Code

[hsablonniere]

Thanks a lot for this @KannarFr, and sorry for the delay.

As we discussed, we would rather get a well detailed issue that describes the problem, and let us evaluate the impacts, ask the right questions and find the right solution. That is easier on our side, where we manage the business concerns, the code and its history, and the rest of the roadmap.

The problem itself is a real one and we want to solve it: I have opened #1830 to track it, and referenced your proposal there. Closing this PR, the discussion continues in the issue.

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