fix(reader): keep footer compact on mobile and clear text under chrome

On phones the footer's progress cell rendered the full chapter title (e.g. 'Long Chapter Name · 5 / 12') in a div with no max-width or nowrap, so the text wrapped to multiple lines and ballooned the bottom bar. Combined with viewport offsets that were computed from assumed pixel heights with ~0px margin, the book text slipped underneath the bars.

Chapter label in footer: split #progress-display into two spans (progressLabel hidden on mobile via 'hidden sm:inline', progressMain always shown) and cap it with 'truncate whitespace-nowrap max-w-[5rem] sm:max-w-none' so it can never wrap or grow the bar. Phones now show just '5 / 12'; larger screens keep 'Chapter · 5 / 12'.

Viewport offset: replace the fragile hardcoded calc() with runtime measurement. Gave the chrome bars ids (reader-topbar/reader-bottombar) and added updateViewportInsets(), which sets #reader-viewport top/bottom from each bar's real offsetHeight (which already includes env(safe-area-inset-*) padding) plus a 6px margin. It runs on init and refreshes on resize, orientationchange, and via a ResizeObserver, so the content area tracks the actual chrome height on any DPI, notch, home-indicator, or zoom level instead of guessing.

Refactored formatProgress into formatProgressParts (returns {label, main}; only chapter mode sets a label) with a setProgress() helper wiring progressLabel/progressMain/progressText across the relocate, cycleProgressMode, and applyProgressMode call sites. Rebuilt reader_templ.go and style.css.

web/src/reader/reader.ts

@@ -372,6 +372,8 @@ document.addEventListener("alpine:init", () => {
     interactionMode: "select" as string,
     magnifierEnabled: false,
     progressText: "",
+    progressLabel: "",
+    progressMain: "",
     sliderValue: 0,
     settings: null as ReaderSettings | null,
     justify: true,
@@ -489,21 +491,20 @@ document.addEventListener("alpine:init", () => {
           tocItem,
           section,
         };
-        const progressStr = this.formatProgress(
+        const progressParts = this.formatProgressParts(
           fraction,
           location,
           pageItem,
           tocItem,
           section,
         );
-        this.progressText = progressStr;
+        this.setProgress(progressParts);
         this.sliderValue = fraction;
         const slider = document.getElementById(
           "progress-slider",
         ) as HTMLInputElement;
         if (slider) {
           slider.value = fraction;
-          slider.title = progressStr;
         }
         const range = e.detail.range as Range | undefined;
         if (range) {
@@ -547,6 +548,34 @@ document.addEventListener("alpine:init", () => {
       }
       this.initTime = Date.now();
       this.fetchReadingSpeed();
+      this.setupViewportInsets();
+    },
+    updateViewportInsets() {
+      const top = document.getElementById("reader-topbar");
+      const bot = document.getElementById("reader-bottombar");
+      const vp = document.getElementById("reader-viewport");
+      if (!top || !bot || !vp) return;
+      const margin = 6;
+      vp.style.setProperty("top", `${top.offsetHeight + margin}px`);
+      vp.style.setProperty("bottom", `${bot.offsetHeight + margin}px`);
+    },
+    setupViewportInsets() {
+      const top = document.getElementById("reader-topbar");
+      const bot = document.getElementById("reader-bottombar");
+      this.updateViewportInsets();
+      window.addEventListener("resize", () => this.updateViewportInsets());
+      window.addEventListener("orientationchange", () =>
+        setTimeout(() => this.updateViewportInsets(), 250),
+      );
+      if (
+        typeof ResizeObserver !== "undefined" &&
+        top &&
+        bot
+      ) {
+        const ro = new ResizeObserver(() => this.updateViewportInsets());
+        ro.observe(top);
+        ro.observe(bot);
+      }
     },
     debouncedSaveProgress(fraction: number, location: any, cfi: string) {
       if (Date.now() - this.initTime < 5000) return;
@@ -774,19 +803,20 @@ document.addEventListener("alpine:init", () => {
         /* ignore bookmark errors for now */
       }
     },
-    formatProgress(
+    formatProgressParts(
       fraction: number,
       location: { current: number; next: number; total: number },
       pageItem: { id: number; label: string; href: string },
       tocItem: FoliateTocItem | null,
       section: { current: number; total: number },
-    ): string {
+    ): { label: string; main: string } {
       const percent = new Intl.NumberFormat("en", { style: "percent" }).format(
         fraction,
       );
+      const chapterLabel = tocItem?.label ? `${tocItem.label} · ` : "";
       switch (this.progressMode) {
         case "percentage":
-          return percent;
+          return { label: "", main: percent };
         case "chapter": {
           if (this.isFixedLayout && tocItem && this.chapterBoundaries.length > 0) {
             const totalSections = this.book?.sections?.filter(
@@ -809,10 +839,10 @@ document.addEventListener("alpine:init", () => {
                 1,
                 Math.min(currentPage - chapterStart + 1, chapterPages),
               );
-              const label = tocItem.label
-                ? `${tocItem.label} · `
-                : "";
-              return `${label}${currentInChapter} / ${chapterPages}`;
+              return {
+                label: chapterLabel,
+                main: `${currentInChapter} / ${chapterPages}`,
+              };
             }
           }
           if (tocItem && this.chapterBoundaries.length > 0) {
@@ -836,10 +866,10 @@ document.addEventListener("alpine:init", () => {
                 1,
                 Math.min(currentPage - chapterStart + 1, chapterPages),
               );
-              const label = tocItem.label
-                ? `${tocItem.label} · `
-                : "";
-              return `${label}${currentInChapter} / ${chapterPages}`;
+              return {
+                label: chapterLabel,
+                main: `${currentInChapter} / ${chapterPages}`,
+              };
             }
           }
           if (section && this.sectionFractionsArr.length > 1) {
@@ -859,16 +889,19 @@ document.addEventListener("alpine:init", () => {
                 Math.round((fraction - startFrac) * pageBase),
               );
               const clamped = Math.min(currentInSec, totalInSec);
-              const label = tocItem?.label
-                ? `${tocItem.label} · `
-                : "";
-              return `${label}${clamped} / ${totalInSec}`;
+              return {
+                label: chapterLabel,
+                main: `${clamped} / ${totalInSec}`,
+              };
             }
           }
           if (location.total > 0) {
-            return `${percent} · ${location.current} / ${location.total}`;
+            return {
+              label: "",
+              main: `${percent} · ${location.current} / ${location.total}`,
+            };
           }
-          return percent;
+          return { label: "", main: percent };
         }
         case "time-left": {
           if (this.readingSpeedPpm > 0 && location.total > 0) {
@@ -877,30 +910,47 @@ document.addEventListener("alpine:init", () => {
             if (mins >= 60) {
               const hrs = Math.floor(mins / 60);
               const m = mins % 60;
-              return `${percent} · ~${hrs}h ${m}m left`;
+              return { label: "", main: `${percent} · ~${hrs}h ${m}m left` };
             }
-            return `${percent} · ~${mins} min left`;
+            return { label: "", main: `${percent} · ~${mins} min left` };
           }
-          return `${percent} · ~-- min left`;
+          return { label: "", main: `${percent} · ~-- min left` };
         }
         default: {
           if (this.isFixedLayout) {
             const pageInfo = this.getRenderedPageInfo();
             if (pageInfo) {
-              return `${pageInfo.current} / ${pageInfo.total}`;
+              return { label: "", main: `${pageInfo.current} / ${pageInfo.total}` };
             }
           }
           if (pageItem) {
-            return `${percent} · Page ${pageItem.label}`;
+            return { label: "", main: `${percent} · Page ${pageItem.label}` };
           }
           const pageInfoReflow = this.getRenderedPageInfo();
           if (pageInfoReflow) {
-            return `${percent} · ${pageInfoReflow.current + 1} / ${pageInfoReflow.total}`;
+            return {
+              label: "",
+              main: `${percent} · ${pageInfoReflow.current + 1} / ${pageInfoReflow.total}`,
+            };
           }
-          return `${percent} · ${location.current} / ${location.total}`;
+          return {
+            label: "",
+            main: `${percent} · ${location.current} / ${location.total}`,
+          };
         }
       }
     },
+    setProgress(parts: { label: string; main: string }, sliderTitle?: string) {
+      this.progressLabel = parts.label;
+      this.progressMain = parts.main;
+      this.progressText = parts.label + parts.main;
+      const slider = document.getElementById(
+        "progress-slider",
+      ) as HTMLInputElement;
+      if (slider) {
+        slider.title = sliderTitle ?? this.progressText;
+      }
+    },
     cycleProgressMode() {
       const modes = ["pages", "chapter", "percentage", "time-left"];
       const idx = modes.indexOf(this.progressMode);
@@ -909,19 +959,15 @@ document.addEventListener("alpine:init", () => {
       if (this.lastRelocateDetail) {
         const { fraction, location, pageItem, tocItem, section } =
           this.lastRelocateDetail;
-        this.progressText = this.formatProgress(
-          fraction,
-          location,
-          pageItem,
-          tocItem,
-          section,
+        this.setProgress(
+          this.formatProgressParts(
+            fraction,
+            location,
+            pageItem,
+            tocItem,
+            section,
+          ),
         );
-        const slider = document.getElementById(
-          "progress-slider",
-        ) as HTMLInputElement;
-        if (slider) {
-          slider.title = this.progressText;
-        }
       }
     },
     async fetchReadingSpeed() {
@@ -944,19 +990,15 @@ document.addEventListener("alpine:init", () => {
       if (this.lastRelocateDetail) {
         const { fraction, location, pageItem, tocItem, section } =
           this.lastRelocateDetail;
-        this.progressText = this.formatProgress(
-          fraction,
-          location,
-          pageItem,
-          tocItem,
-          section,
+        this.setProgress(
+          this.formatProgressParts(
+            fraction,
+            location,
+            pageItem,
+            tocItem,
+            section,
+          ),
         );
-        const slider = document.getElementById(
-          "progress-slider",
-        ) as HTMLInputElement;
-        if (slider) {
-          slider.title = this.progressText;
-        }
       }
     },
     computeFixedLayoutChapterBoundaries() {