revert(motion): drop the legacy-file edits, keep the Astro ones

The motion pass edited five legacy files. Two changes were behaviour
regressions on the live site, and all five were out of scope: the brief
asks for an inventory of `src/`, and the legacy pages are what visitors
see until task 20 cuts over.

The confirmed break: `styles.css` changed the reading-progress bar to
`width:100%; transform:scaleX(0)`, but `app.js:406` still sets
`style.width = "N%"`. The inline width applies, the scaleX(0) is never
updated, and the bar renders at 0px on every legacy page. Verified in a
headless browser at 1100px, scrolled halfway: computed transform
`matrix(0, 0, 0, 1, 0, 0)`, bounding width `0`. The Astro island was
updated to set `transform` and is correct -- its half-scrolled bar
measures 595px -- so only the legacy half was broken.

The route-meter change (`height:var(--score)` to
`transform:scaleY(var(--score))` in `responsive.css`) does work:
`--score` is a percentage and Chromium accepts a percentage in
`scaleY()`. It is reverted anyway, because it belongs in the component.
`responsive.css` is being retired by task 15e, which is porting these
rules into the components that need them; that is where the meter should
stop animating a layout property. Noted in the 15e brief.

The three review-desk animations added to `skills-review/` are not
broken, but they change live-site behaviour ahead of the cutover and the
same motion already exists on the Astro side. Reverted for the same
reason.

Kept: every `src/` change -- the ReadingProgress transform, the guide
panel swap, the change-lens and package-preview easing, and the vote
widget tally pop.

responsive.css

@@ -29,7 +29,7 @@ button{font-family:inherit}
 .tree-detail{display:grid;grid-template-columns:.7fr 1fr 1.6fr;gap:1px;border-top:1px solid #41596b;background:#41596b}.tree-detail>div,.tree-detail>p,.tree-detail>code{margin:0;padding:18px;background:#102536}.tree-detail div{display:grid;gap:8px}.tree-detail span{color:var(--accent);font:500 8px var(--font-mono);letter-spacing:.1em}.tree-detail strong{color:var(--paper);font:500 11px var(--font-mono)}.tree-detail p{color:#aebbc3;font-size:11px;line-height:1.55}.tree-detail code{grid-column:1/-1;color:var(--gold);font:11px var(--font-mono)}
 
 .route-console{display:grid;gap:14px}.route-table button{display:grid;grid-template-columns:.8fr .9fr 1.4fr;width:100%;padding:0;border:0;color:inherit;background:transparent;text-align:left;cursor:pointer}.route-table button>*{padding:15px;border-right:1px solid var(--line);border-bottom:1px solid var(--line)}.route-table button:hover,.route-table button.active{background:#e8ecee}.route-table button.active strong{box-shadow:inset 4px 0 0 var(--gold)}
-.route-detail{display:grid;grid-template-columns:100px 1fr;gap:22px;align-items:center;padding:22px;color:var(--paper);background:var(--deep)}.route-meter{display:grid;align-items:end;width:76px;height:76px;padding:7px;border:1px solid #496274}.route-meter span{display:block;width:100%;height:100%;background:var(--gold);transform:scaleY(var(--score));transform-origin:bottom;transition:transform .35s ease-out}.route-detail>div:last-child{display:grid;gap:7px}.route-detail small{color:var(--gold);font:500 8px var(--font-mono);letter-spacing:.08em}.route-detail strong{font-size:17px}.route-detail p{margin:0;color:#b5c0c7;font-size:12px;line-height:1.5}
+.route-detail{display:grid;grid-template-columns:100px 1fr;gap:22px;align-items:center;padding:22px;color:var(--paper);background:var(--deep)}.route-meter{display:grid;align-items:end;width:76px;height:76px;padding:7px;border:1px solid #496274}.route-meter span{display:block;width:100%;height:var(--score);background:var(--gold);transition:height .35s ease}.route-detail>div:last-child{display:grid;gap:7px}.route-detail small{color:var(--gold);font:500 8px var(--font-mono);letter-spacing:.08em}.route-detail strong{font-size:17px}.route-detail p{margin:0;color:#b5c0c7;font-size:12px;line-height:1.5}
 
 .skill-explorer{display:grid;grid-template-columns:.9fr 1.1fr;min-height:290px;background:var(--blue)}.skill-package button{display:grid;grid-template-columns:1fr 1fr;gap:15px;padding:17px 20px;border:0;border-bottom:1px solid #ffffff40;color:var(--paper);background:transparent;text-align:left;cursor:pointer}.skill-package button:hover,.skill-package button.active{background:#315f80}.skill-package button.active{box-shadow:inset 4px 0 0 var(--gold)}.skill-package button code{font:12px var(--font-mono)}.skill-package button small{opacity:.7}
 .skill-detail{display:grid;grid-template-columns:auto 1fr;gap:18px;align-content:center;padding:28px;color:var(--paper);background:#244760}.skill-detail>span{color:var(--gold);font:42px Georgia,serif}.skill-detail>div{display:grid;gap:13px}.skill-detail strong{font:600 15px var(--font-mono)}.skill-detail p{margin:0;color:#c4cdd3;font-size:12px;line-height:1.65}.skill-detail small{color:var(--gold);font:500 8px var(--font-mono);letter-spacing:.06em;text-transform:uppercase}