fix(#219): add pagination to sessions history tab (#357)

* fix(#219): add pagination to sessions history tab

The /api/sessions endpoint was called without pagination params, so the server returned only its default limit of 20 sessions.

- SessionListResponse: added total/limit/offset fields from server response
- HermesApiService: added @Query params (limit, offset, order) to getSessions()
- SessionsViewModel: added loadMore() that appends pages, hasMore derived from total
- SessionsScreen: added 'Load more sessions' button + loading spinner at bottom of list

* chore: remove plan file from git

* fix: compilation errors in sessions pagination

* chore: gitignore plan files

* fix: remove duplicate brace

---------

Co-authored-by: M57 <hy4ri@users.noreply.github.com>

app/src/test/java/com/m57/hermescontrol/E2eIntegrationTest.kt

@@ -428,7 +428,9 @@ class E2eIntegrationTest {
     fun testSessionsListing_success() =
         runTest {
             val session = SessionInfo("session-123", "Session 1", "2026-06-15T15:10:00Z", 5, "active")
-            coEvery { mockApiService.getSessions() } returns Response.success(SessionListResponse(listOf(session)))
+            coEvery {
+                mockApiService.getSessions(any(), any(), any())
+            } returns Response.success(SessionListResponse(listOf(session)))
 
             val viewModel = SessionsViewModel()
             viewModel.loadSessions()
@@ -463,7 +465,7 @@ class E2eIntegrationTest {
     @Test
     fun testSessionsLoad_failure() =
         runTest {
-            coEvery { mockApiService.getSessions() } returns createErrorResponse(500)
+            coEvery { mockApiService.getSessions(any(), any(), any()) } returns createErrorResponse(500)
 
             val viewModel = SessionsViewModel()
             viewModel.loadSessions()