feat(i18n): localize toast notifications and placement errors

[AlaskanTuna]

Found by a swarm audit hunting for user-facing strings that never reach a locale file — the same class of bug as the tooltips (#38) and the PDF disclaimers (#42), but larger.

The gap

23 notify.* calls used literal English; only 2 places in the whole app used t(). SolarSim advertises full en/ms/zh support, but every toast on the Workbench and Analysis pages was English-only — including the ones a user hits most while actually editing a layout.

Also three placement-rejection messages in useCanvasInteractions.ts ('That placement overlaps another panel.' and friends), which surface through notify.error when a drag is refused.

13 real user-facing strings in total. The 24th match was a comment in toastConfig.tsx, not a finding.

Changes

• toasts blocks added to workbench.json (11 keys) and analysis.json (2 keys) in all three locales.
• useTranslation wired into the four hooks that own these messages — useCanvasInteractions, useWorkbenchSave, useOverlayImages, useAnalysisPdf. None of them imported it before.
• Interpolation preserved via i18next params rather than template literals: {{count}} for panel counts, {{filename}}, {{mode}}, {{reason}}.
• getPlacementErrorMessage now takes TFunction — it is a module-level helper, so t has to be passed in rather than closed over.

Incidental fix: .gitignore broke ripgrep

Lines 46–47 were Icon[ and ] on separate lines. The canonical macOS template puts Icon[\r] on one line; split like this, Icon[ is an unclosed character class and ripgrep rejects the entire ignore file:

rg: ./.gitignore: line 46: error parsing glob 'Icon[': unclosed character class; missing ']'

That fired on every rg invocation in the repo. Replaced with Icon?, which still matches macOS's Icon\r. Verified the error is gone.

Verified

• grep -rnE "notify\.(info|success|error|warning)\(\s*[\'"]"overfrontend/srcreturns **only a comment** — every real toast now goes throught()`.
• All 15 locale files agree across en/ms/zh.
• tsc --noEmit 0 errors · 216 frontend tests pass · pnpm lint pass · Prettier clean.

https://claude.ai/code/session_01URDpaxhXyPLWnUQtvowNyM

[coderabbitai]

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