feat(web): pages locales aide / statistiques / réglages (serveur HTTP 127.0.0.1)

Nouveau module webserver.nim : mini-serveur HTTP local (port libre a partir de 38943) qui sert des pages HTML generes en Nim - aide (nouvelle entree de menu tray), statistiques et reglages. La page reglages enregistre via POST (config.json) et l'application recharge la configuration au tick suivant. Menu Aide/Statistiques/Reglages ouvrent le navigateur par defaut, avec repli sur les dialogues natifs si le serveur est indisponible. Refactor config/stats (loadConfigFrom/saveConfigTo, loadStatsFrom/saveStatsTo) pour tester sans toucher aux fichiers reels. 8 suites de tests (60 tests), ajout de test_webserver avec integration HTTP reelle.

tests/test_webserver.nim

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+## test_webserver.nim
+## ==================
+## Tests du module webserver : parsing HTTP, décodage du formulaire,
+## application des réglages, rendu des pages et intégration réelle
+## (serveur local 127.0.0.1 interrogé en HTTP).
+
+import std/[unittest, httpclient, os, uri, tables, strutils]
+import ../src/webserver
+import ../src/config
+
+proc tmpDir(): string =
+  getAppFilename().parentDir / ".webdata_test"
+
+suite "http helpers":
+  test "parseRequest parses GET with query":
+    let req = parseRequest("GET /help?lang=fr HTTP/1.1\r\nHost: 127.0.0.1\r\n\r\n")
+    check req.verb == "GET"
+    check req.path == "/help"
+    check req.body == ""
+
+  test "parseRequest parses POST with body":
+    let req = parseRequest(
+      "POST /settings HTTP/1.1\r\nContent-Length: 10\r\n\r\nworkMin=30")
+    check req.verb == "POST"
+    check req.path == "/settings"
+    check req.body == "workMin=30"
+
+  test "parseRequest decodes percent-encoding":
+    let req = parseRequest("GET /settings%3Fx HTTP/1.1\r\n\r\n")
+    check req.path == "/settings?x"
+
+  test "htmlEscape escapes special characters":
+    check htmlEscape("<a href=\"x\">&'") == "&lt;a href=&quot;x&quot;&gt;&amp;&#39;"
+
+  test "parseForm decodes urlencoded pairs":
+    let f = parseForm("workMin=30&lang=fr&soundEnabled=on&note=Hello%20world")
+    check f["workMin"] == "30"
+    check f["lang"] == "fr"
+    check f["soundEnabled"] == "on"
+    check f["note"] == "Hello world"
+
+suite "applySettings":
+  test "applies a full form":
+    let base = defaultConfig()
+    let form = parseForm("workMin=40&shortBreakMin=8&longBreakMin=20&" &
+      "cyclesBeforeLongBreak=5&dailyGoal=6&lang=en&activeProfile=Sprint&" &
+      "soundEnabled=on&doNotDisturb=on&" &
+      "reminders_json=" & encodeUrl("""[{"text":"Boire de l'eau","enabled":true}]"""))
+    let cfg = applySettings(base, form)
+    check cfg.workMin == 40
+    check cfg.shortBreakMin == 8
+    check cfg.longBreakMin == 20
+    check cfg.cyclesBeforeLongBreak == 5
+    check cfg.dailyGoal == 6
+    check cfg.lang == "en"
+    check cfg.activeProfile == "Sprint"
+    check cfg.soundEnabled
+    check cfg.doNotDisturb
+    check not cfg.autoStart
+    check cfg.healthReminders.len == 1
+    check cfg.healthReminders[0].text == "Boire de l'eau"
+
+  test "invalid values fall back to current ones":
+    let base = defaultConfig()
+    let form = parseForm("workMin=abc&lang=zz&activeProfile=Inexistant")
+    let cfg = applySettings(base, form)
+    check cfg.workMin == base.workMin
+    check cfg.lang == "auto"
+    check cfg.activeProfile == base.activeProfile
+
+suite "rendering":
+  test "pages contain expected content":
+    var cfg = defaultConfig()
+    cfg.lang = "fr"   # langue fixe : le rendu ne dépend pas du système
+    check "NimPulse" in renderHelp(cfg)
+    check "Pomodoro" in renderHelp(cfg)
+    check "Statistiques" in renderStats(cfg)
+    check "Réglages" in renderSettings(cfg)
+    check "name=\"workMin\"" in renderSettings(cfg)
+    check "reminders_json" in renderSettings(cfg)
+
+suite "integration (local HTTP server)":
+  test "GET routes work and settings POST persists":
+    let dir = tmpDir()
+    removeDir(dir)
+    createDir(dir)
+    # Configuration initiale en français : le rendu est déterministe.
+    var initCfg = defaultConfig()
+    initCfg.lang = "fr"
+    saveConfigTo(initCfg, dir / "config.json")
+    setDataDirOverride(dir)
+    defer: setDataDirOverride("")
+
+    let port = startWebServer()
+    check port > 0
+    defer: stopWebServer()
+
+    let base = "http://127.0.0.1:" & $port
+    let client = newHttpClient()
+
+    let help = client.getContent(base & "/help")
+    check "NimPulse" in help
+
+    let stats = client.getContent(base & "/stats")
+    check "Statistiques" in stats
+
+    let settings = client.getContent(base & "/settings")
+    check "name=\"workMin\"" in settings
+
+    # Sauvegarde via POST (comme le ferait le navigateur).
+    let body = "workMin=33&shortBreakMin=6&longBreakMin=18&cyclesBeforeLongBreak=4&" &
+      "dailyGoal=5&lang=fr&activeProfile=Classique&" &
+      "reminders_json=" & encodeUrl(
+        """[{"text":"Étire-toi","enabled":true},{"text":"Bois de l'eau","enabled":false}]""")
+    let resp = client.postContent(base & "/settings", body)
+    check "Réglages enregistrés" in resp
+
+    # Le fichier config.json a été écrit dans le répertoire de test.
+    let saved = loadConfigFrom(dir / "config.json")
+    check saved.workMin == 33
+    check saved.dailyGoal == 5
+    check saved.lang == "fr"
+    check saved.healthReminders.len == 2
+    check saved.healthReminders[1].enabled == false
+
+    # Le drapeau de rechargement est posé puis consommé.
+    check consumeSettingsChanged()
+    check not consumeSettingsChanged()
+
+    # La page réglages reflète les nouvelles valeurs.
+    let settings2 = client.getContent(base & "/settings")
+    check "value=\"33\"" in settings2
+
+    removeDir(dir)