feat(ui): add result highlighting and remove window shadow

Highlighting:
- Dynamic plugin results (calculator, converter, websearch, filesearch)
  get a subtle accent left-border + background tint when auto-detected
- Exact name matches (case-insensitive) are highlighted the same way
- Exact match on apps gets a higher score boost (50k) than other
  providers (30k), so apps rank first when names match exactly

Shadow:
- Removed hardcoded box-shadow from all theme CSS files
- Added --owlry-shadow variable in base.css (defaults to none)
- Themes can opt into shadow via --owlry-shadow if desired

CSS class: .owlry-result-highlight on ResultRow

data/themes/apex-neon.css

@@ -77,8 +77,6 @@
 .owlry-main {
     background-color: rgba(5, 5, 5, 0.98);
     border: 1px solid rgba(38, 38, 38, 0.8);
-    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.8),
-                0 0 0 1px rgba(255, 0, 68, 0.1);
 }
 
 .owlry-search {

data/themes/catppuccin-mocha.css

@@ -24,8 +24,6 @@
 .owlry-main {
     background-color: rgba(30, 30, 46, 0.95);
     border: 1px solid rgba(69, 71, 90, 0.6);
-    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5),
-                0 0 0 1px rgba(203, 166, 247, 0.1);
 }
 
 .owlry-search {

data/themes/dracula.css

@@ -24,8 +24,6 @@
 .owlry-main {
     background-color: rgba(40, 42, 54, 0.95);
     border: 1px solid rgba(98, 114, 164, 0.6);
-    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5),
-                0 0 0 1px rgba(189, 147, 249, 0.1);
 }
 
 .owlry-search {

data/themes/gruvbox-dark.css

@@ -24,8 +24,6 @@
 .owlry-main {
     background-color: rgba(40, 40, 40, 0.95);
     border: 1px solid rgba(80, 73, 69, 0.6);
-    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5),
-                0 0 0 1px rgba(254, 128, 25, 0.1);
 }
 
 .owlry-search {

data/themes/nord.css

@@ -24,8 +24,6 @@
 .owlry-main {
     background-color: rgba(46, 52, 64, 0.95);
     border: 1px solid rgba(76, 86, 106, 0.6);
-    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4),
-                0 0 0 1px rgba(136, 192, 208, 0.1);
 }
 
 .owlry-search {

data/themes/one-dark.css

@@ -24,8 +24,6 @@
 .owlry-main {
     background-color: rgba(40, 44, 52, 0.95);
     border: 1px solid rgba(24, 26, 31, 0.6);
-    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5),
-                0 0 0 1px rgba(97, 175, 239, 0.1);
 }
 
 .owlry-search {

data/themes/owl.css

@@ -33,8 +33,6 @@
 .owlry-main {
     background-color: rgba(26, 27, 38, 0.95);
     border: 1px solid rgba(65, 72, 104, 0.6);
-    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5),
-                0 0 0 1px rgba(224, 175, 104, 0.1);
 }
 
 .owlry-search {

data/themes/rose-pine.css

@@ -24,8 +24,6 @@
 .owlry-main {
     background-color: rgba(25, 23, 36, 0.95);
     border: 1px solid rgba(38, 35, 58, 0.6);
-    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5),
-                0 0 0 1px rgba(196, 167, 231, 0.1);
 }
 
 .owlry-search {

data/themes/solarized-dark.css

@@ -24,8 +24,6 @@
 .owlry-main {
     background-color: rgba(0, 43, 54, 0.95);
     border: 1px solid rgba(88, 110, 117, 0.6);
-    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5),
-                0 0 0 1px rgba(38, 139, 210, 0.1);
 }
 
 .owlry-search {

data/themes/tokyo-night.css

@@ -24,8 +24,6 @@
 .owlry-main {
     background-color: rgba(26, 27, 38, 0.95);
     border: 1px solid rgba(65, 72, 104, 0.6);
-    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5),
-                0 0 0 1px rgba(122, 162, 247, 0.1);
 }
 
 .owlry-search {