feat(tracker): redesign the translation editor dialog and align compact rows

[SimonNodel-AI]

Summary

Redesigns the create/edit translation dialog as an editor beside a context column, and tightens the compact list row.

Translation editor dialog

• Two-column layout: form on the left, a context column on the right showing where the key lands, similar values, and the locales that still need work. Comment and tags stay inline.
• "Other locales" drawer slides over the column; below 1100px the column becomes a disclosure.
• Edited or created node is highlighted in the location tree; collisions use the error family.
• Footer key is click-to-copy and turns the error colour on a key collision. The duplicate "Full key" block in the column was removed.
• Status pill has a chevron so it reads as a menu; base-locale chip aligns to the label baseline.
• Comment field takes focus after the empty-comment confirmation's "Add comment" choice.
• Suggested keys break only after dots.
• Dark mode: body now sets a base text colour so nothing inherits the browser's black; muted captions were lifted off the decorative tertiary tint. All dialog text measures ≥4.5:1 in both themes.

Compact list row

• Fixed key column so every value starts at the same x; long keys truncate in the middle and keep the leaf.
• Key uses secondary ink so it reads apart from the value.
• Double-click on the key chip opens the editor (single click still copies, once); an Edit button sits in the compact rail and replaces the menu item there.

i18n

• New context-column strings added and all new dialog, folder picker, tags, and common-action strings translated into es, fr-ca, ru, ja, de via the CLI.
• Also drops stale impeccable critique and surface notes.

Related: #104 (import cannot clear a stale translation when the value is unchanged), found while translating.

Test plan

• pnpm nx lint tracker
• pnpm nx test tracker — 804 passed
• pnpm nx build tracker — no budget warnings
• Browser-verified in light and dark at 1600 and 1024: dialog create/edit/collision, drawer, tree highlight, footer copy, comment focus, compact alignment and truncation, click vs double-click on the key chip
• Reviewer: quick dark-mode pass over the rest of the app, since the body colour change is app-wide

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