feat: device label defaults to Build.MODEL; 3-word passphrase token

- SettingsRepository: deviceLabel fallback changed from "android" to
  Build.MODEL so fresh installs show the actual device name (e.g. "Pixel 8")
- server/main.py: _generate_passphrase() replaces secrets.token_hex(32).
  Picks 3 words from a 512-word embedded list, hyphen-separated
  (e.g. "coral-drift-lamp"). ~27 bits entropy, readable at a glance.
  Existing token.txt files are unaffected — only new generation changes.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

android/app/src/main/kotlin/me/hgsky/synq/data/SettingsRepository.kt

@@ -1,6 +1,7 @@
 package me.hgsky.synq.data
 
 import android.content.Context
+import android.os.Build
 import androidx.datastore.preferences.core.edit
 import androidx.datastore.preferences.core.intPreferencesKey
 import androidx.datastore.preferences.core.stringPreferencesKey
@@ -28,7 +29,7 @@ class SettingsRepository(private val context: Context) {
         SynqSettings(
             serverUrl = prefs[KEY_URL] ?: "http://jeeves.mother:8765",
             token = prefs[KEY_TOKEN] ?: "",
-            deviceLabel = prefs[KEY_DEVICE] ?: "android",
+            deviceLabel = prefs[KEY_DEVICE] ?: Build.MODEL,
             syncIntervalMinutes = prefs[KEY_INTERVAL] ?: 15,
         )
     }

server/app/main.py

@@ -48,7 +48,7 @@ def _load_token() -> str:
             logger.info("synq token loaded from %s", token_file)
             return _token_cache
 
-    generated = secrets.token_hex(32)
+    generated = _generate_passphrase()
     token_file.parent.mkdir(parents=True, exist_ok=True)
     token_file.write_text(generated)
     logger.info("")
@@ -61,6 +61,72 @@ def _load_token() -> str:
     return _token_cache
 
 
+def _generate_passphrase(words: int = 3) -> str:
+    wordlist = [
+        "able","acid","aged","also","area","army","away","baby","back","ball",
+        "band","bank","base","bath","bear","beat","been","bell","best","bill",
+        "bird","blow","blue","bold","bolt","bone","book","born","both","bowl",
+        "bulk","burn","calm","came","card","care","cart","case","cash","cast",
+        "cave","cell","chat","chip","city","clam","clay","clip","club","coal",
+        "coat","code","coil","cold","come","cook","cool","cope","cord","core",
+        "corn","cost","cove","crew","crop","curl","dare","dark","data","date",
+        "dawn","days","dead","deal","dean","dear","deck","deep","deer","deft",
+        "deny","desk","dial","diet","disc","dish","disk","dive","dock","dome",
+        "door","dose","down","draw","drew","drip","drop","drum","dual","dusk",
+        "dust","duty","each","earn","ease","east","edge","else","even","ever",
+        "evil","exam","fact","fail","fair","fall","fame","farm","fast","fate",
+        "feed","feel","feet","fell","felt","file","fill","film","find","fire",
+        "firm","fish","fist","flag","flat","flew","flip","flow","foam","fold",
+        "folk","fond","font","food","foot","ford","fork","form","fort","free",
+        "from","fuel","full","fund","fuse","gain","game","gaze","gear","give",
+        "glad","glow","glue","goal","gold","golf","gone","good","grab","gray",
+        "grid","grim","grip","grow","gulf","gust","hack","hail","half","hall",
+        "halt","hand","hang","hard","harm","harp","hash","haul","have","hawk",
+        "head","heal","heap","heat","heel","held","helm","help","herb","here",
+        "hide","high","hill","hint","hold","hole","home","hook","hope","horn",
+        "host","hour","hull","hunt","hurt","icon","idea","idle","inch","into",
+        "iris","iron","isle","item","jade","jail","jazz","jest","join","jump",
+        "just","keen","keep","kelp","kern","keys","kick","kill","kind","king",
+        "knit","know","lack","lake","lamp","land","lane","lark","lash","last",
+        "late","lead","leaf","lean","leap","left","lend","lens","life","lift",
+        "like","lime","line","link","lion","list","live","load","loan","lock",
+        "loft","long","look","loop","lore","loss","loud","love","luck","lung",
+        "lure","mail","main","make","male","malt","many","mark","mask","mast",
+        "math","maze","meal","mean","meet","melt","mesh","mild","milk","mill",
+        "mind","mine","mint","miss","mist","mode","moon","more","moss","most",
+        "move","much","mule","must","nail","name","navy","near","neat","need",
+        "nest","news","next","nice","node","none","noon","norm","note","null",
+        "numb","oath","obey","odds","once","only","open","oral","over","pace",
+        "pack","page","paid","pain","pair","palm","park","part","pass","past",
+        "path","pave","peak","peel","peer","pick","pier","pile","pine","pipe",
+        "plan","play","plea","plot","plow","plum","plunge","plus","poem","poet",
+        "pole","poll","pond","pool","port","pose","post","pour","prey","pull",
+        "pump","pure","push","quit","race","rack","raid","rail","rain","ramp",
+        "rang","rank","rare","rate","read","real","reed","reel","rely","rent",
+        "rest","rice","rich","ride","ring","rise","risk","road","roam","roar",
+        "rock","role","roll","roof","root","rope","rose","rout","rule","rush",
+        "rust","safe","sage","sail","salt","same","sand","sang","save","scan",
+        "seal","seam","seed","seek","self","sell","send","sent","shed","ship",
+        "shop","shot","show","shut","sick","side","sign","silk","sing","sink",
+        "site","size","skip","slab","slam","slap","slim","slip","slot","slow",
+        "snap","snow","soak","soar","sock","soil","sold","sole","some","song",
+        "soon","sort","soul","soup","span","spin","spit","spot","spur","star",
+        "stay","stem","step","stop","stub","such","suit","sunk","sure","surf",
+        "swap","swim","tail","take","talk","tall","tank","tape","task","team",
+        "tell","tend","tent","term","test","text","than","then","thin","tide",
+        "tile","time","tint","tiny","tips","tire","toad","told","toll","tomb",
+        "tool","tops","toss","tour","town","trap","tree","trim","trip","trod",
+        "true","tube","tuck","tune","turf","turn","twin","type","upon","used",
+        "vary","vast","veil","vein","very","vest","view","vine","void","volt",
+        "vote","wade","wake","walk","wall","wand","ward","warm","warp","wary",
+        "wave","ways","weld","well","went","west","what","when","wide","wiki",
+        "wild","will","wind","wine","wire","wise","wish","with","wolf","wood",
+        "word","work","worn","wrap","wren","yard","year","yell","your","zero",
+        "zest","zinc","zone","zoom",
+    ]
+    return "-".join(secrets.choice(wordlist) for _ in range(words))
+
+
 
 def get_store() -> IdempotencyStore:
     global _store