fix(ui): E31 S2 — the tab names the object, the channel header wraps, the player fits a short window

- The browser tab names the place and the object: PageHeading reports the
  view's own title (lib/documentTitle), so a channel, playlist or any Plex
  view reads "<object> · <module> · Siftlode" however it was opened; the
  Feed is named too; a season adds its show (tabTitle).
- The channel page's tab + action row wraps and lets the tag lane fold into
  "+N": at 1024 it ran past the edge and the page scrolled sideways.
- The YouTube player card's width is capped from the window height less the
  chrome measured under the video: at 133% zoom (685px) it cut its channel row.
- Plex certificate words (Not Rated, Approved, Passed) are named through the
  vocabulary on the info badge, show page, collection, filter and chips.
- DESIGN.md: the zoom target is 125% and 133%, not 200% (decision log).

docs/DESIGN.md

@@ -39,8 +39,8 @@ runs this check before it is called done (E28 S3g):
 4. **Seen.** A screenshot of every changed state, thin edges at 1:1; the tablet widths (1024 × 768, a
    narrow split screen) when the layout can reflow. Phones are the E29 epic's, not this check's.
 5. **Judged as a whole** (E30 S6). For each screenshot, one written line on its composition: where the empty
-   space is, what hugs one side, what the eye lands on first. Then the screen at 200% browser zoom and at
-   the largest text size. Both are held to [Composition and the reader](#composition-and-the-reader--decided-e30-s6).
+   space is, what hugs one side, what the eye lands on first. Then the screen at 125% and 133% browser
+   zoom and at the largest text size. All are held to [Composition and the reader](#composition-and-the-reader--decided-e30-s6).
    A rule that holds is not the same as a screen that works: the person page passed every rule above with
    half its panel empty.
 
@@ -465,8 +465,9 @@ of a full-width panel and nothing on the right.
   (TMDB, YouTube) is fetched ahead of time by a job, not on the click, so a page never waits on it.
   Late content keeps its place (B8). [Nielsen #1, RAIL]
 - **Zoom and text size are first-class.** The owner reads with the browser zoomed and a large text size.
-  Every screen holds at 200% browser zoom on a desktop window and at the largest Settings text size at
-  1024 wide: nothing clipped or overlapping, no sideways page scroll, every control reachable and at
+  Every screen holds at 125% and 133% browser zoom on a 1080p desktop window (what the owner uses: the
+  layout of a 1536 × 729 and a 1444 × 685 viewport) and at the largest Settings text size at 1024 wide:
+  nothing clipped or overlapping, no sideways page scroll, every control reachable and at
   least its rung, text wrapping rather than cut. Measured, not assumed, on every UI change. [WCAG 1.4.4,
   1.4.10, 1.4.12]
 
@@ -688,3 +689,4 @@ of a full-width panel and nothing on the right.
 | 2026-09-27 | Match switch on the panel                        | `ui/MatchToggle` above the picker from two picks, everywhere; one wording (Any / All)                                                                                                                                                                                                                                  | The picker's popover footer (Feed, Plex collection)                                                                                                                                                    | A closed picker hid an active "all"; six pickers had drawn it two ways                                                                                                                        |
 | 2026-09-27 | Missing picture, bare link                       | A glyph of the kind for no picture; a download with no name is titled by its short link, once                                                                                                                                                                                                                          | An empty box; the URL as title, channel and link                                                                                                                                                       | The owner's picks 4A and 3A: an empty box read as loading, the URL showed three times                                                                                                         |
 | 2026-09-27 | Copy on a selection                              | Right-click on selected words keeps the browser's menu; no app Copy row                                                                                                                                                                                                                                                | An app menu with Copy first                                                                                                                                                                            | A real browser's menu has copy, search and translate; only the desktop pane's is thin                                                                                                         |
+| 2026-10-01 | Zoom target 125–133%                             | Screens are held at 125% and 133% browser zoom (1536 × 729, 1444 × 685 on a 1080p window) and the largest text size                                                                                                                                                                                                    | 200% browser zoom                                                                                                                                                                                      | The owner: 200% was a guess; 125–133% is what they read Siftlode and most sites at, so 200% would be an upper bound nobody uses                                                               |