Squashed commit of the following:

commit 93fb6e5503c9838637a882cdf4ead42ca51dd8a9
Author: Jingxuan Zhou <zlx220000@outlook.com>
Date:   Fri Sep 25 11:00:55 2026 +0800

    revert page thumb gen

commit fc0a2079376ef7d8d1756725fabe0d332afa4a9c
Merge: 1479a8772 1aede5ca2
Author: Jingxuan Zhou <zlx220000@outlook.com>
Date:   Thu Sep 24 22:49:34 2026 +0800

    Merge branch 'main2'

commit 1aede5ca21426056118f83ac0fbfd1e1f724b464
Author: Jingxuan Zhou <zlx220000@outlook.com>
Date:   Thu Sep 24 22:48:38 2026 +0800

    pdf rtl seekbar

commit 1479a8772cd2b58e06550a57a8d575cc2be0a468
Author: Jingxuan Zhou <zlx220000@outlook.com>
Date:   Thu Sep 24 21:46:03 2026 +0800

    default thumb gen off

commit 23cafef1384681af93d1d38b130f396e0ad8a7e6
Author: Jingxuan Zhou <zlx220000@outlook.com>
Date:   Thu Sep 24 21:45:02 2026 +0800

    PdfRenderer goes to a hardware bitmap

commit 96be7f8638db227a107be2dbbb99c0ccab1d2044
Author: Jingxuan Zhou <zlx220000@outlook.com>
Date:   Thu Sep 24 21:39:27 2026 +0800

    pdf reader page gen thumb

commit 593a0c56130c50ec10e3f9c08646acf6342d5709
Author: Jingxuan Zhou <zlx220000@outlook.com>
Date:   Thu Sep 24 21:17:59 2026 +0800

    prepareToDraw

commit 8bd951fefd2a7a97cd3b3e02102a392ef975f958
Author: Jingxuan Zhou <zlx220000@outlook.com>
Date:   Thu Sep 24 21:14:52 2026 +0800

    reader decode once for thumb and page

commit adf5cb8e88cd9b739fee7faf6266c946668b1f53
Author: Jingxuan Zhou <zlx220000@outlook.com>
Date:   Thu Sep 24 20:56:51 2026 +0800

    image reader page thumb from bitmap

commit 89301cb8cad87179b4696c7a27d2322205ac1339
Author: Jingxuan Zhou <zlx220000@outlook.com>
Date:   Thu Sep 24 20:52:08 2026 +0800

    pdf reader page thumb