v2.10.1: drop save-as-default, replace the three new themes with real palettes

- removed 'save as default' and /api/theme: pingping is a read-only system and should
  not write preferences server-side. Theme choice stays in the browser, as before.
- the three themes I improvised were poor. Replaced with palettes that exist because
  someone spent real effort on them:
    nord      — Nord, desaturated blue-greys, one frost accent
    solarized — Solarized Light, warm paper tuned for long reading
    amber     — DEC VT220 amber phosphor, single hue in three intensities
  Six total: dark, daylight, arctic, nord, solarized, amber.

Verified: all six apply correctly, save button gone, /api/theme returns 404, no JS errors.

Author: githubflyideas

static/index.html

@@ -30,32 +30,34 @@
     --smoke:rgba(11,114,133,.18); --lossbar:rgba(209,67,63,.5); --glow:0;
     --smoke-hot:#064a57; --smoke-mid:#1596ad; --smoke-cool:#b3722f;
   }
-  /* Amber: the old amber-phosphor CRT — warm orange trace on near-black */
-  html[data-theme="amber"] {
-    --bg:#0c0a06; --panel:#16120b; --screen:#080602; --line:#2a2115;
-    --phos:#ffb340; --amber:#ffd28a; --alert:#ff6b4a; --ink:#e8d5b0; --dim:#8a7550;
-    --grid-axis:#3a2e1c; --grid-split:#1e1810;
-    --smoke:rgba(255,179,64,.16); --lossbar:rgba(255,107,74,.5); --glow:7;
-    --smoke-hot:#fff0d0; --smoke-mid:#ffb340; --smoke-cool:#8a6020;
-    --shadow:0 1px 2px rgba(0,0,0,.6); --shadow-lg:0 10px 30px rgba(0,0,0,.5);
+  /* Nord — the arctic palette that ships in half the terminals on earth.
+     Desaturated blue-greys with a single frost accent; nothing shouts. */
+  html[data-theme="nord"] {
+    --bg:#2e3440; --panel:#3b4252; --screen:#292e39; --line:#434c5e;
+    --phos:#88c0d0; --amber:#ebcb8b; --alert:#bf616a; --ink:#e5e9f0; --dim:#7b88a1;
+    --grid-axis:#4c566a; --grid-split:#373e4c;
+    --smoke:rgba(136,192,208,.18); --lossbar:rgba(191,97,106,.55); --glow:5;
+    --smoke-hot:#eceff4; --smoke-mid:#88c0d0; --smoke-cool:#5e81ac;
+    --shadow:0 1px 2px rgba(0,0,0,.35); --shadow-lg:0 10px 30px rgba(0,0,0,.30);
   }
-  /* Mono: high-contrast black on white — for printing and bright rooms */
-  html[data-theme="mono"] {
-    --bg:#ffffff; --panel:#fbfbfb; --screen:#ffffff; --line:#d8d8d8;
-    --phos:#111111; --amber:#666666; --alert:#c00000; --ink:#111111; --dim:#777777;
-    --grid-axis:#c8c8c8; --grid-split:#ededed;
-    --smoke:rgba(17,17,17,.22); --lossbar:rgba(192,0,0,.45); --glow:0;
-    --smoke-hot:#000000; --smoke-mid:#444444; --smoke-cool:#999999;
-    --shadow:0 1px 2px rgba(0,0,0,.08); --shadow-lg:0 8px 24px rgba(0,0,0,.10);
+  /* Solarized Light — Ethan Schoonover's palette, tuned for long reading sessions.
+     Warm paper base, muted cyan trace, red reserved strictly for loss. */
+  html[data-theme="solarized"] {
+    --bg:#fdf6e3; --panel:#fffbf0; --screen:#fffdf6; --line:#e5ddc8;
+    --phos:#2aa198; --amber:#b58900; --alert:#dc322f; --ink:#586e75; --dim:#93a1a1;
+    --grid-axis:#d6cfba; --grid-split:#efe8d5;
+    --smoke:rgba(42,161,152,.22); --lossbar:rgba(220,50,47,.45); --glow:0;
+    --smoke-hot:#0f5f5a; --smoke-mid:#2aa198; --smoke-cool:#93a1a1;
+    --shadow:0 1px 3px rgba(101,123,131,.12); --shadow-lg:0 10px 28px rgba(101,123,131,.16);
   }
-  /* Midnight: deep blue, low blue-light glare for night shifts */
-  html[data-theme="midnight"] {
-    --bg:#0a0e1a; --panel:#111726; --screen:#070a14; --line:#1e2740;
-    --phos:#6db3ff; --amber:#ffc857; --alert:#ff5c7a; --ink:#c3d2e8; --dim:#5a6b85;
-    --grid-axis:#243050; --grid-split:#131a2c;
-    --smoke:rgba(109,179,255,.16); --lossbar:rgba(255,92,122,.5); --glow:6;
-    --smoke-hot:#e8f4ff; --smoke-mid:#6db3ff; --smoke-cool:#3a5580;
-    --shadow:0 1px 2px rgba(0,0,0,.5); --shadow-lg:0 10px 30px rgba(0,0,0,.45);
+  /* Amber CRT — a DEC VT220 in a dim room. One hue, three intensities, that is it. */
+  html[data-theme="amber"] {
+    --bg:#100c04; --panel:#1a1409; --screen:#0a0702; --line:#3a2c14;
+    --phos:#ffb000; --amber:#ffcc55; --alert:#ff5f2e; --ink:#f0c674; --dim:#8a6d3a;
+    --grid-axis:#463a1c; --grid-split:#221a0c;
+    --smoke:rgba(255,176,0,.16); --lossbar:rgba(255,95,46,.5); --glow:8;
+    --smoke-hot:#fff3d0; --smoke-mid:#ffb000; --smoke-cool:#7a5410;
+    --shadow:0 1px 2px rgba(0,0,0,.6); --shadow-lg:0 10px 30px rgba(0,0,0,.55);
   }
   * { box-sizing:border-box; margin:0; }
   body { background:var(--bg); color:var(--ink); font-family:var(--mono); padding:18px 22px; }
@@ -112,7 +114,6 @@
   <div class="mark">pingping ●</div>
   <div class="tag">One binary. One graph. Zero guesswork.</div>
   <button class="pill" id="themeBtn" title="switch theme" style="margin-left:auto">◐ <span id="themeName">dark</span></button>
-  <button class="pill" id="themeSave" title="save this theme as the default for everyone on this install">save as default</button>
 </header>
 
 <div class="row">
@@ -176,17 +177,9 @@
 <script>
 const $ = id => document.getElementById(id);
 const cssv = n => getComputedStyle(document.documentElement).getPropertyValue(n).trim();
-const THEMES = ['dark', 'daylight', 'arctic', 'amber', 'mono', 'midnight'];
+const THEMES = ['dark', 'daylight', 'arctic', 'nord', 'solarized', 'amber'];
 let theme = localStorage.getItem('pp_theme') || 'dark';
 if (!THEMES.includes(theme)) theme = 'dark';
-// 本地没手动选过 -> 跟随服务端保存的默认主题
-if (!localStorage.getItem('pp_theme')) {
-  fetch('/api/theme').then(r => r.json()).then(d => {
-    if (d.theme && THEMES.includes(d.theme) && d.theme !== theme) {
-      theme = d.theme; applyTheme(); render();
-    }
-  }).catch(() => {});
-}
 function applyTheme() {
   if (theme === 'dark') delete document.documentElement.dataset.theme;
   else document.documentElement.dataset.theme = theme;
@@ -418,15 +411,6 @@
   applyTheme();
   render();
 };
-$('themeSave').onclick = async () => {
-  const btn = $('themeSave'), old = btn.textContent;
-  try {
-    await fetch('/api/theme', { method: 'POST', body: theme });
-    btn.textContent = 'saved ✓';
-  } catch { btn.textContent = 'failed'; }
-  setTimeout(() => { btn.textContent = old; }, 1500);
-};
-
 window.addEventListener('resize', () => chart && chart.resize());
 </script>
 </body>

web.go

@@ -6,13 +6,9 @@ import (
 	"embed"
 	"encoding/hex"
 	"encoding/json"
-	"io"
 	"log"
 	"net/http"
-	"os"
-	"path/filepath"
 	"strconv"
-	"strings"
 	"sync"
 	"time"
 )
@@ -119,31 +115,6 @@ func serveWeb(cfg *Config, store *Store, users map[string]string) error {
 		writeJSON(w, map[string]bool{"ok": true})
 	})
 
-	// Default theme, stored next to the data so it survives restarts and follows the
-	// install rather than one browser. GET returns it; POST saves it.
-	themeFile := filepath.Join(cfg.DataDir, "theme")
-	mux.HandleFunc("/api/theme", func(w http.ResponseWriter, r *http.Request) {
-		if r.Method == http.MethodPost {
-			body, _ := io.ReadAll(io.LimitReader(r.Body, 32))
-			name := strings.TrimSpace(string(body))
-			for _, c := range name {
-				if !(c >= 'a' && c <= 'z') { // whitelist: theme ids are lowercase letters
-					http.Error(w, `{"error":"bad theme"}`, http.StatusBadRequest)
-					return
-				}
-			}
-			if name == "" {
-				http.Error(w, `{"error":"bad theme"}`, http.StatusBadRequest)
-				return
-			}
-			os.WriteFile(themeFile, []byte(name), 0o644)
-			writeJSON(w, map[string]string{"theme": name})
-			return
-		}
-		b, _ := os.ReadFile(themeFile)
-		writeJSON(w, map[string]string{"theme": strings.TrimSpace(string(b))})
-	})
-
 	mux.HandleFunc("/api/version", func(w http.ResponseWriter, r *http.Request) {
 		writeJSON(w, map[string]string{"version": version})
 	})