#296 r3: shrink URL column, render URL values as plain text

Owner override postdating PR #300 QA pass:
- .col-url 340 -> 230px; reclaim slack from history-only columns (Views 96->90,
  Created 190->150, ID 190->120) so the table fits the .float pane with no
  horizontal scroll at 1400x900 and the ID column is fully visible.
- URL anchors drop the shared .slug pill (background/padding/radius/mono font)
  and render plain, styled via td.dim exactly like the none case; links stay
  anchors with accent hover. Ellipsis kept for genuinely long slugs.

Verified by CDP probe on a local build at 1400x900 and 375x812 on /public and
/mine (/saved): column order, table fits pane (scrollWidth == clientWidth),
20-char slug fully visible, min Created-to-URL content gap 77px, sort arrows
intact 6px right of labels, no CSP/console violations. go build/test pass.

internal/web/static/app.css

@@ -357,6 +357,8 @@ tr.row:hover td a.slug { color: var(--accent); }
 /* #292: highlight the paste NAME uniformly on row hover, titled or not */
 tr.row:hover td .paste-name { color: var(--accent); }
 td a.slug { font-family: var(--font-mono); font-size: 21.6px; color: var(--fg); text-decoration: none; }
+td a.url-link { font-family: inherit; font-size: inherit; color: inherit; text-decoration: none; }
+td a.url-link:hover { color: var(--accent); }
 td a.slug:hover { color: var(--accent); }
 /* PASTE column fallback for untitled pastes: plain text, identical to a titled paste. URL/ID chips keep .slug styling. */
 td a.slug.paste-name { background: none; padding: 0; border-radius: 0; font-family: inherit; font-size: inherit; color: var(--fg); }
@@ -531,7 +533,7 @@ td a.paste-name { color: var(--fg); text-decoration: none; font-family: inherit;
 /* paste name under slug pill in Paste column (#43) */
 .paste-sub { font-size: 19.8px; color: var(--muted-fg); margin-top: 2px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
 .paste-sub.dim { color: var(--muted); }
-td a.slug.url-link { max-width: 100%; display: inline-block; vertical-align: middle; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; box-sizing: border-box; }
+td a.url-link { max-width: 100%; display: inline-block; vertical-align: middle; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; box-sizing: border-box; }
 td .id-link { color: var(--muted-fg); text-decoration: none; font-family: var(--font-mono); font-size: 19.8px; }
 td .id-link:hover { color: var(--accent); }
 
@@ -892,11 +894,11 @@ button[type="submit"]:focus-visible,
 .hidden { display: none; }
 .can-page { max-width: 900px; width: 100%; }
 .col-a { width: 260px; } .col-b { width: 140px; } .col-c { width: 120px; }
-.col-d { width: 96px; } .col-d2 { width: 150px; } .col-e { width: 190px; }
-.col-f { width: 100px; } .col-g { width: 190px; }
+.col-d { width: 90px; } .col-d2 { width: 150px; } .col-e { width: 150px; }
+.col-f { width: 100px; } .col-g { width: 120px; }
 /* #255: history's URL column had its own narrow width (col-f doubles as
    /mine's ID column); give it a dedicated class. */
-.col-url { width: 340px; }
+.col-url { width: 230px; }
 /* #210: /mine rows render a delete button cell that had no declared column,
    so under table-layout:fixed it overlapped the ID column. */
 .col-del { width: 64px; }