feat(nav): simplify navigation and terms (#57)

One glossary (docs/GLOSSARY.md) for all de and en texts.
Five nav items; phones get a bottom bar with labels.
Community page with following, followers, player search and stats.
The bell is the one place for notes, news and open questions.
Settings in tabs; auto-save is silent and rolls back on error.
Questions page explains itself; removed games are a library filter.
Own profile: menu link, public chip, copy link, private hint.
Points page starts with a short summary; stats use status colors.

docs/GLOSSARY.md

@@ -0,0 +1,42 @@
+# Glossary
+
+One word per idea in all German (de) and English (en) texts (`public/i18n/*.json`). `src/i18n.test.js` fails when an
+old term comes back. A new text uses these words; a new idea gets a row here first.
+
+| Concept | de | en |
+|---|---|---|
+| finish a game (status FINISHED) | durchspielen, durchgespielt (never "beenden", "abgeschlossen", "Beender") | finish, finished |
+| 100 % status (COMPLETED) | 100 % | 100% (no space) |
+| proof of play (rewards) | Nachweis, nachgewiesen (never "Beweis", "frisches Spielen") | proof, proven; "recent play" (never "fresh play") |
+| earn points | Punkte bringen / es gibt Punkte (never "zahlen") | earn points (never "pay") |
+| points booked to the wallet | gutgeschrieben | credited |
+| currency / page name | Pile Points | Pile Points |
+| pile (games with status BACKLOG) | **Pile of Shame** (proper name, also in German, masculine; never "Stapel") | Pile of Shame; "pile" only inside "Pile of Shame" |
+| status BACKLOG | Backlog | Backlog |
+| `/backlog` tab and dashboard tile | Warteschlange | Queue |
+| `/play-next` | Als Nächstes | Play next |
+| game page card (priority, notes) | Mein Fortschritt | My progress |
+| find games page (`/search`) | Spiele finden | Find games |
+| library search box | In deiner Bibliothek suchen | Search your library |
+| sync | der Sync; button "Sync starten"; "Sync läuft …"; "Letzter Sync {{when}}" (never "synchronisieren", "Synchronisierung") | sync; "Sync now"; "Syncing …"; "Last sync {{when}}" |
+| retry | button "Noch einmal versuchen"; sentence "Versuche es noch einmal." / "… später noch einmal." (never "erneut") | button "Try again"; sentence "Try again." / "Try again later." (never "Please try again") |
+| link queue (auditors) | Verknüpfungen (never "Warteschlange") | Link queue |
+| notifications (bell) | Postfach, Nachricht | Inbox, message |
+| people you follow (list, tile, tab) | Ich folge (never "Folgen" as a noun); the button stays "Folgen" | Following |
+| community page | Community | Community |
+| playtime (played hours) | Spielzeit | playtime (one word) |
+| time to beat (IGDB) | Spieldauer (never "Spielzeit") | time to beat |
+| status history (V14 log) | Status-Verlauf | status history |
+| edition of one game | Edition, Editionen (never "Ausgabe") | edition |
+| link / unlink an account (Steam, PSN) | verknüpfen / trennen | link / unlink |
+| link games as one (auditor) | verknüpfen / Verknüpfung lösen | link / unlink |
+| hide a game | ausblenden | hide |
+| hide a tile | verstecken | hide |
+| user | Nutzer (never "Spieler", "Person" for app users) | user |
+| auditor role | Auditor | auditor |
+| inbox entry | Nachricht | message (never "note": notes are game notes) |
+| email | E-Mail (labels), Mail (in sentences ok) | email (never "a mail", "mails") |
+| log in / out | anmelden / abmelden | log in / log out (verbs on buttons) |
+| manual game | manuelles Spiel | manual game |
+| address form | informal "du", imperative ("Versuche es …"); no impersonal "Bitte … versuchen" | – |
+| quotes | „…“ | "…" |