feat(VocabPracticeDialog, VocabCourseView): implement SRS rating feature and enhance user feedback

- Added SRS rating buttons in VocabPracticeDialog to allow users to rate their confidence after answering vocabulary questions.
- Updated methods to handle SRS ratings and integrated them into the review process, improving spaced repetition feedback.
- Enhanced UI with new styles for SRS rating buttons and updated translations for SRS-related terms in multiple languages.
- Modified VocabCourseView to display appropriate introductory text based on SRS due items, improving user guidance.

frontend/src/i18n/locales/ceb/socialnetwork.json

@@ -731,7 +731,8 @@
                 "srsEyebrow": "Dugay nga memorya",
                 "srsTitle": "{count} ka termino ang angay karon",
                 "srsIntro": "Kini nga balik-balik gikan sa SRS nga plano sa matag pulong. Una kini kaysa bag-ong materyal kay nagpalig-on kini sa mga pulong nga hapit malimtan.",
-                "srsStart": "Sugdi ang daily review"
+                "srsStart": "Sugdi ang daily review",
+                "courseTodayPlanIntroSrs": "Didaktik nga han-ay: una ang SRS daily review sa tagsa-tagsa ka pulong. Human ana, mubo nga review, padayon sa block, ug intensive review kung kinahanglan. Mao ni ang pagpalig-on sa daan nga materyal sa dili pa modugang ug bag-o."
             },
             "title": "Trainer sa bokabularyo",
             "description": "Paghimo og pinulongans (or subscribe aron them) ug share them uban sa friends.",
@@ -787,7 +788,16 @@
                 "acceptable": "Acceptable answers:",
                 "stats": "Stats",
                 "success": "Malampuson",
-                "fail": "Fail"
+                "fail": "Fail",
+                "srsRateTitle": "Unsa ka lig-on sa imong pagbati?",
+                "srsAgain": "Usab",
+                "srsAgainHint": "balikon dayon",
+                "srsHard": "Lisod",
+                "srsHardHint": "mubo nga interval",
+                "srsGood": "Maayo",
+                "srsGoodHint": "normal nga iskedyul",
+                "srsEasy": "Sayon",
+                "srsEasyHint": "mas layo nga interval"
             },
             "search": {
                 "open": "Pangita",

frontend/src/i18n/locales/de/socialnetwork.json

@@ -453,7 +453,16 @@
                 "acceptable": "Mögliche richtige Übersetzungen:",
                 "stats": "Statistik",
                 "success": "Erfolg",
-                "fail": "Misserfolg"
+                "fail": "Misserfolg",
+                "srsRateTitle": "Wie sicher war das?",
+                "srsAgain": "Nochmal",
+                "srsAgainHint": "sehr bald wiederholen",
+                "srsHard": "Schwer",
+                "srsHardHint": "kurzes Intervall",
+                "srsGood": "Gut",
+                "srsGoodHint": "normal planen",
+                "srsEasy": "Leicht",
+                "srsEasyHint": "größerer Abstand"
             },
             "search": {
                 "open": "Suche",
@@ -813,7 +822,8 @@
                 "srsEyebrow": "Langzeitgedächtnis",
                 "srsTitle": "{count} Begriffe sind heute fällig",
                 "srsIntro": "Diese Wiederholung kommt aus dem SRS-Plan einzelner Begriffe. Sie hat Vorrang vor neuem Stoff, weil sie kurz vor dem Vergessen stabilisiert.",
-                "srsStart": "Tageswiederholung starten"
+                "srsStart": "Tageswiederholung starten",
+                "courseTodayPlanIntroSrs": "Didaktische Reihenfolge: Zuerst die fällige SRS-Tageswiederholung einzelner Begriffe. Danach kommen Kurz-Wiederholungen, Blockfortschritt und ggf. intensive Wiederholung. So wird altes Material stabilisiert, bevor neues Material dazukommt."
             }
         }
     }

frontend/src/i18n/locales/en/socialnetwork.json

@@ -453,7 +453,16 @@
                 "acceptable": "Acceptable answers:",
                 "stats": "Stats",
                 "success": "Success",
-                "fail": "Fail"
+                "fail": "Fail",
+                "srsRateTitle": "How solid did it feel?",
+                "srsAgain": "Again",
+                "srsAgainHint": "repeat very soon",
+                "srsHard": "Hard",
+                "srsHardHint": "short interval",
+                "srsGood": "Good",
+                "srsGoodHint": "normal schedule",
+                "srsEasy": "Easy",
+                "srsEasyHint": "longer interval"
             },
             "search": {
                 "open": "Search",
@@ -813,7 +822,8 @@
                 "srsEyebrow": "Long-term memory",
                 "srsTitle": "{count} terms are due today",
                 "srsIntro": "This review comes from the SRS schedule of individual terms. It should come before new material because it stabilizes items close to forgetting.",
-                "srsStart": "Start daily review"
+                "srsStart": "Start daily review",
+                "courseTodayPlanIntroSrs": "Pedagogical order: start with the due SRS daily review for individual terms. Then quick reviews, block progress, and intensive review if needed. This stabilizes old material before new material is added."
             }
         }
     }