Release exp-v0.52.198: Refine selected transcript text in composer (#6410, @rodboev)

Ships PR #6410 with a maintainer UX fix folded in (authorship preserved).

Adds a 'Refine' action to the message text-selection toolbar: select text in a
chat message -> Refine seeds it into the composer as an editable quoted draft
(marker-free, one-way, existing draft + attachments preserved, 44x44 mobile
icon buttons, all 15 locales). ChatGPT/Notion-style quote-to-edit flow.

Maintainer fix (Fable UX gate): French instruction string now uses the
space-before-colon convention (Instruction d'affinage :).

Gate: Codex SAFE TO SHIP (marker-free, no XSS, one-way Range, Reply/drafts
preserved), Fable SHIP-WITH-UX-FIXES (fix applied), tests 19/19, ESLint clean.

Co-authored-by: rodboev <rodboev@users.noreply.github.com>

static/style.css

@@ -3433,10 +3433,13 @@
 .vscroll-measuring .msg-time{transition:none !important;}
 .msg-action-btn{background:none;border:none;color:var(--muted);cursor:pointer;font-size:13px;padding:2px 5px;border-radius:5px;transition:color .12s,background .12s;line-height:1;}
 .msg-action-btn:hover{color:var(--accent-text);background:var(--accent-bg);}
-.selected-text-reply-btn{position:fixed;z-index:1200;display:inline-flex;align-items:center;gap:6px;padding:7px 11px;border:2px solid var(--accent);border-radius:999px;background:var(--bg);color:var(--text);box-shadow:0 8px 24px rgba(0,0,0,.26),0 0 0 1px var(--surface);font-size:12px;font-weight:700;line-height:1;cursor:pointer;opacity:0;pointer-events:none;transform:translateY(4px);transition:opacity .12s ease,transform .12s ease,background .12s ease,border-color .12s ease;user-select:none;}
-.selected-text-reply-btn.visible{opacity:1;pointer-events:auto;transform:translateY(0);}
-.selected-text-reply-btn:hover{background:var(--accent-bg);border-color:var(--accent-hover);}
-.selected-text-reply-btn:focus-visible{background:var(--accent-bg);border-color:var(--accent-hover);outline:2px solid var(--focus-ring);outline-offset:2px;}
+.selected-text-action-group{position:fixed;z-index:1200;display:inline-flex;align-items:center;gap:2px;padding:3px;border:1px solid var(--border2);border-radius:999px;background:var(--bg);box-shadow:0 8px 24px rgba(0,0,0,.26),0 0 0 1px var(--surface);visibility:hidden;opacity:0;pointer-events:none;transform:translateY(4px);transition:visibility 0s linear .12s,opacity .12s ease,transform .12s ease;user-select:none;}
+.selected-text-action-group.visible{visibility:visible;opacity:1;pointer-events:auto;transform:translateY(0);transition-delay:0s;}
+.selected-text-action-group button{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:32px;padding:7px 11px;border:1px solid transparent;border-radius:999px;background:transparent;color:var(--text);font-family:inherit;font-size:12px;font-weight:700;line-height:1;cursor:pointer;white-space:nowrap;}
+.selected-text-action-group button:hover,.selected-text-action-group button:focus-visible{background:var(--accent-bg);border-color:var(--accent-hover);}
+.selected-text-action-group button:focus-visible{outline:2px solid var(--focus-ring);outline-offset:2px;}
+@media (pointer:coarse){.selected-text-action-group button{min-width:44px;min-height:44px;}}
+@media (max-width:560px){.selected-text-action-group button{width:44px;min-width:44px;padding:7px;font-size:0;}.selected-text-action-group button::before{font-size:16px;}.selected-text-reply-btn::before{content:'↩';}.selected-text-refine-btn::before{content:'✦';}}
 /* TTS speaker button: hidden by default, shown when TTS is enabled.
  * Use body-class selector instead of JS inline-style so the rule survives
  * subsequent renderMd() passes and is not subject to inline-style cascade