chore(brand): lowercase "dembrane" across user-facing strings

[spashii]

What

Brand sweep: lowercase "dembrane" wherever it appears as a user-facing brand reference, per brand/STYLE_GUIDE.md (always lowercase, even at sentence start). Triggered by the QR portal welcome screen still showing "Welcome to Dembrane!" — extends the work in #547.

Scope confirmed with Jorim in Slack (C0B2VBYU79V thread 1778665562.741619):

Changed

• English UI source strings — t\`, , JSX text, alt, <title>, useDocumentTitle`. ~12 .tsx/.ts/.html files.
• All 7 translation .po files (de-DE, en-US, es-ES, fr-FR, it-IT, nl-NL, uk-UA): msgid + msgstr for live entries, and #~-marked obsolete entries for consistency. Path-reference comments (#:) preserved.
• Compiled .ts message bundles via pnpm messages:compile (ran with node_modules/.bin/lingui compile --typescript since pnpm isn't in my sandbox).
• ASR hotwords list in server/dembrane/transcribe.py (["Dembrane", "Sameer"] → ["dembrane", "Sameer"]).
• Directus admin: "Dembrane Events" → "dembrane events" choice label in scripts/create_schema.py and directus/sync/snapshot/fields/workspace/legal_basis.json. Directus project_name setting → "dembrane".
• Hardcoded multilingual onboarding card text in useOnboardingCards.ts (7 languages, including German caps as Jorim explicitly OK'd).

Left alone (intentional)

• React component / hook / prop names: DembraneLogomark, DembraneLoadingSpinner, LogoDembrane, alwaysDembrane, useDembraneChat, isDembraneKey, isDembraneUser, getDembraneEventsPrivacyCard.
• Python identifiers, package metadata (pyproject.toml name = "Dembrane"), file paths.
• Internal pipeline IDs that flow to DB / API responses: Dembrane-25-09, Dembrane-26-01-redaction, Dembrane-25-09-assemblyai-partial, Dembrane-Webhook/1.0 user-agent.
• The Notion privacy-policy URL slug (Privacy-Statement-Dembrane-…).
• Jinja prompt templates and agent/agent.py lines that quote "Dembrane" as the incorrect spelling to avoid.
• .po path-reference comments (#:) pointing to component files like DembraneLoadingSpinner/index.tsx.
• brand/STYLE_GUIDE.md example line showing the incorrect form.
• Internal dev tools (tools/usage-tracker/), READMEs, cypress/TEST_DOCUMENTATION.md.
• Test fixtures using "Dembrane" as a hotword string.

Verification

• tsc --noEmit on echo/frontend — clean.
• python3 -m py_compile on changed .py files — clean.
• lingui compile --typescript — clean, no warnings, all .ts bundles have 0 capital "Dembrane".
• python3 -c 'import json; json.load(...)' on changed .json files — clean.
• Grep across the repo for remaining "Dembrane" — all remaining occurrences are in the intentionally-skipped categories above.

Confidence

Medium-high. The mechanical replacement is straightforward and verified by grep/typecheck. Two areas to keep an eye on:

1. Directus admin labels (project_name in collections/settings.json, "dembrane events" text choice). These are sync-snapshot files — applying them rewrites Directus settings. If the deploy pipeline syncs these automatically, the label change ships at deploy time. I haven't tested the Directus sync path. Question for review: is changing project_name here desired, or should this stay "Dembrane" for the admin context?
2. Compiled .ts files: I ran lingui compile rather than pnpm messages:compile, because pnpm isn't in my environment. The CLI should be equivalent (same binary), but if CI runs the pnpm-flavored script and the output drifts, this is where to look.

Notes

• No new strings added; all msgids now match their (lowercased) source. No translator action needed.
• Stale duplicate msgids in en-US.po (live + obsolete with same text) predate this PR — I didn't touch them beyond the casing change. lingui extract --clean would clean those up but rewrites 20k+ lines, so I left it for a separate PR.

Originating Slack message: thread 1778665562.741619 in #general (or whichever — C0B2VBYU79V).

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