Compact density and built-in Iosevka font for denser log display

Settings > Interface > Log display gets a Density switch (Normal/Compact)
that tightens row padding and line height, and the font list gets Iosevka,
a narrow SIL OFL monospace font served from web/fonts (Latin subset,
13 KB per weight) so it works offline, unlike the Bunny Fonts ones.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

README.md

@@ -222,12 +222,15 @@ remembered per browser.
 - **Interface**
   - *Theme*: System (follows the computer/phone preference), Light or Dark. The sun/moon
     button in the header switches between light and dark.
-  - *Log display*: font size (tiny, small, medium, large) and font: the system monospace
-    font, or one of 12 free fonts made for dense text (JetBrains Mono, Fira Code, Source
-    Code Pro, IBM Plex Mono, Cascadia Code, Roboto Mono, Ubuntu Mono, Inconsolata, Red Hat
-    Mono, Noto Sans Mono, Victor Mono, DM Mono). They are loaded by the browser from
-    [Bunny Fonts](https://fonts.bunny.net), a privacy-friendly European font service; without
-    internet access, the system font is used. Ligatures are disabled so `->` or `!=` show as typed.
+  - *Log display*: font size (tiny, small, medium, large), density (normal, or compact to
+    fit about 50% more lines on screen) and font: the system monospace font,
+    [Iosevka](https://github.com/be5invis/Iosevka) (narrow, so more text fits on each line;
+    served by LogStream itself, works offline), or one of 12 free fonts made for dense text
+    (JetBrains Mono, Fira Code, Source Code Pro, IBM Plex Mono, Cascadia Code, Roboto Mono,
+    Ubuntu Mono, Inconsolata, Red Hat Mono, Noto Sans Mono, Victor Mono, DM Mono). These 12 are
+    loaded by the browser from [Bunny Fonts](https://fonts.bunny.net), a privacy-friendly
+    European font service; without internet access, the system font is used. Ligatures are
+    disabled so `->` or `!=` show as typed. The densest setting is Tiny + Compact + Iosevka.
 - **Data**: "Delete all logs" permanently erases every stored log (you must type
   `PURGE` to confirm). Tags and settings are kept. VictoriaLogs needs `-delete.enable`
   (already set in `docker-compose.yml`); set `ALLOW_PURGE=false` to disable the feature.