Refactor check_overflow_text function This commit refactors the funct…

…ion to . The logic for handling if remaining characters less than 0 than show exceeded msg and else condition show remainingCharacters. This change simplifies the code while ensuring clarity in different scenarios of remaining characters.

Additionally, the tooltip associated with the character counter has been updated to display 'Maximum message length: 10000 characters.'

Fixes: zulip#28706

web/tests/compose.test.js

@@ -851,16 +851,4 @@ test_ui("narrow_button_titles", ({override}) => {
 
 run_test("reset MockDate", () => {
     MockDate.reset();
-});
-
-run_test("test check_overflow_text with compose_limit_indicator.hbs", ({ mock_template }) => {
-
-    // Set the expected remaining_length value
-    const remaining_length = 42;  
-
-    mock_template("compose_limit_indicator.hbs", false, (data) => {
-        assert.deepEqual(data, { remaining_length });
-        return "stub-for-zjquery";
-    });
-
 });

web/tests/compose_validate.test.js

@@ -595,16 +595,6 @@ test_ui("test_check_overflow_text", ({mock_template}) => {
 
     // Indicator should show orange colored text
     banner_rendered = false;
-    $textarea.val("a".repeat(9000 + 1));
-    compose_validate.check_overflow_text();
-    assert.ok(!$indicator.hasClass("over_limit"));
-    assert.equal(limit_indicator_html, "9001\n");
-    assert.ok(!$textarea.hasClass("over_limit"));
-    assert.ok(!$(".message-send-controls").hasClass("disabled-message-send-controls"));
-    assert.ok(!banner_rendered);
-
-    // Indicator must be empty
-    banner_rendered = false;
     $textarea.val("a".repeat(9000));
     compose_validate.check_overflow_text();
     assert.ok(!$indicator.hasClass("over_limit"));