fix(ui): send < > | on the ISO key in the German paste layout

[another-novelty]

Fixes #1698

Summary

German paste maps < and > to AltGr+2/3, which types ² and ³ on a German host. | maps to AltGr+^, which types nothing. On German ISO keyboards all three are on the key between left Shift and Y (IntlBackslash). Map them there, like de_CH.ts does.

Tested on a JetKVM with release 0.5.9 plus this change: paste into a Windows host with German layout types <, > and | correctly.

Checklist

• Ran make test_e2e locally and passed
• Linked to issue(s) above by issue number (e.g. Closes #<issue-number>)
• One problem per PR (no unrelated changes)
• Lints pass; CI green

🤖 Generated with Claude Code

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[another-novelty]

Checks run locally on this branch:

• ui: tsc --noEmit, oxlint (no new warnings)
• e2e static checks: tsc -p tsconfig.e2e.json, oxlint on e2e (0 warnings, 0 errors)
• e2e/remote-agent: go test -race ./... passes

I did not run the device suites. I have no dedicated test device and no Linux test host for the remote-agent suite. The change is tested by hand on a JetKVM with 0.5.9 plus this patch, pasting into a Windows host with German layout.