fix: smart select next find mode if find mode is .auto

src/buffer/Buffer.zig

@@ -1039,9 +1039,19 @@ const Node = union(enum) {
                 }
             }
         };
+        const pattern_ = switch (mode) {
+            .exact => pattern,
+            .case_folded => unicode.case_fold(allocator, pattern) catch
+                allocator.dupe(u8, pattern) catch
+                @panic("OOM find_all_ranges"),
+        };
+        defer switch (mode) {
+            .exact => {},
+            .case_folded => allocator.free(pattern_),
+        };
         var ctx: Ctx = .{
             .allocator = allocator,
-            .pattern = pattern,
+            .pattern = pattern_,
             .data = data,
             .callback = callback,
             .buf = try allocator.alloc(u8, pattern.len * 2),

src/tui/mode/mini/find.zig

@@ -180,7 +180,11 @@ const cmds = struct {
     pub fn toggle_find_mode(self: *Self, _: Ctx) Result {
         const new_find_mode: Buffer.FindMode = switch (self.find_mode) {
             .exact => .case_folded,
-            .auto, .case_folded => .exact,
+            .case_folded => .exact,
+            .auto => if (Buffer.unicode.is_lowercase(self.input_.items))
+                .exact
+            else
+                .case_folded,
         };
         const allocator = self.allocator;
         const query = try allocator.dupe(u8, self.input_.items);