fix(rofi): #143 — reset selection to row 0 on query edits (inputchange)

Upstream keeps the selected row *index* across a refilter (rofi#2317),
so backspacing grew the list back under a stationary highlight and Enter
launched the wrong app. The maintainer's reply pointed at the
inputchange {} config block — adopted as pure config in the generated
config.rasi (kb-row-first on every query edit), no patch, no source
build. Covers every rofi surface: drun, text menus, dmenu pickers.

V2: headless VM (theme-shot variant driving QMP keystrokes). On HEAD the
repro left the highlight on row 3 (kitty -> Bulk Rename); patched, the
highlight snaps to the first entry after backspace — verified in the
executive-slate drun grid, boreal's whole-swap grid, and the
keyboard-layout dmenu picker. nix flake check --no-build passes; the
rendered config.rasi carries the nested block.

Backlog #143 deleted (watch closed), decision recorded as Resolved,
ROADMAP checkmark added.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

docs/ROADMAP.md

@@ -589,6 +589,25 @@ Design/decision records and a running log of shipped work (items marked
   hardened against — a clean install cannot reach that state. V2:
   `checks.doctor` grew a linger sub-case (warn fires, exit stays 0, clears
   after `disable-linger`). The Waybar exec-once loose thread became #149.
+- ✓ **Rofi highlight lands on an unrelated entry after backspace (#143,
+  2026-07-17):** upstream keeps the selected row *index* across a refilter
+  (rofi#2317), so backspacing grew the list back under a stationary
+  highlight — Enter then launched the wrong app. Bernardo's 07-16 ruling
+  ("wait for upstream, no source-built rofi distro-wide") was priced
+  against a patch; the maintainer's reply pointed at a knob the item's
+  `-dump-config` survey had missed: the `inputchange {}` configuration
+  block. Shipped as config, zero build cost: `inputchange { action:
+  "kb-row-first"; }` in the generated `config.rasi` (rofi.nix
+  extraConfig — home-manager renders nested sections), so every edit of
+  the query resets the highlight to row 0, dmenu/launcher/text-menus
+  alike — the same "reset on filter change" dmenu and fuzzel ship.
+  Trade-off accepted: arrow-down-then-refine no longer holds position,
+  but that is precisely the interaction that was broken. V2 headless VM
+  (scratch theme-shot variant driving QMP keystrokes): on HEAD the
+  repro's highlight stayed on row 3 ("kitty" → "Bulk Rename"); patched,
+  backspace snaps it to the first entry — shown in the drun grid
+  (executive-slate), boreal's whole-swap grid, and the keyboard-layout
+  dmenu picker.
 - ✓ **Dock mode survives a rebuild (#142, 2026-07-16):** Bernardo: every rebuild
   while docked re-lit the laptop panel and threw a workspace onto it, and he
   re-picked Dock mode by hand. It was not forgetfulness — **a rebuild performed