fix: don't show "unloads in" when keep_alive=-1

With the radagast server flipped to OLLAMA_KEEP_ALIVE=-1, /api/ps
returns expires_at as year 4001 (effectively forever), which the
old code rendered as "Hot: gemma2:9b — unloads in 17500000h". Add
a 7-day threshold to formatRemaining(); anything beyond that just
shows the model name with no expiry suffix.

CHANGELOG.md

@@ -10,6 +10,9 @@ Versioning: [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 ### Added
 - "Scan image" button next to the input pane: opens the phone's rear camera (or a file picker on desktop), runs OCR locally in the browser via Tesseract.js (loaded from esm.sh on first use), and replaces the editor contents with the recognised text. Language follows the "From" dropdown via an ISO 639-2 mapping; "Auto-detect" loads a common European set (`eng+por+deu+nld`). Progress status shows beneath the input ("Loading OCR engine…" → "OCR 40%" → "OCR done in 3.2s"). Zero image-size cost — same CDN pattern as CodeMirror.
 
+### Fixed
+- "Hot: …" status no longer claims "unloads in X" when the server's `keep_alive` is `-1` (Ollama returns an absurd year-4001 `expires_at`). Threshold: any expiry >7 days drops the suffix and just shows the model name.
+
 ## [0.2.0] - 2026-06-09
 
 ### Added

static/index.html

@@ -547,6 +547,10 @@
       if (!expiresAt) return null;
       const ms = new Date(expiresAt).getTime() - Date.now();
       if (!isFinite(ms) || ms <= 0) return null;
+      // Ollama's keep_alive=-1 returns expires_at far in the future (year 4001).
+      // Any realistic finite keep_alive is hours at most, so treat >7 days
+      // as "never unloads" and drop the misleading suffix.
+      if (ms > 7 * 24 * 60 * 60 * 1000) return null;
       const totalSec = Math.floor(ms / 1000);
       const mins = Math.floor(totalSec / 60);
       const secs = totalSec % 60;