Text expander: edit all shortcuts as one text, plus %tab%, %tabkey% and %enter%

[4di-hello]

I use the text expander a lot for long AI prompts (some are 2,000+ characters). Two things made that hard: the template field is small and fixed-height, and moving shortcuts between devices or editing them on a PC is only possible via a full backup. This PR adds both without any new settings.

Edit all as text

A button "Edit all as text" on the Text expander screen opens all shortcuts in one full screen editor:

=== ;cic ===
Long prompt …
over several lines

=== mfg ===
Best regards

• Copy all / Paste all, Share, Save as file, Load from file – easy to edit in any editor and move between devices
• Jump bar with all shortcuts, tap to jump to a block
• Saving applies exactly the text: first it checks for errors (with line numbers: duplicate shortcut, space in shortcut, empty text, invalid regex, text before the first header), then it asks for confirmation showing "x new, y changed, z deleted" and lists deleted shortcuts by name
• Restore previous: the state before the last save is kept and can be restored (tapping again switches back)
• Prefixes are kept (characters before the first letter, e.g. ;cic), regex shortcuts are written as === regex: pattern ===
• Header lines are highlighted, the existing placeholder chips are available in the editor too

New placeholders

• %tab% inserts a tab character (indentation, tables)
• %tabkey% presses the Tab key, e.g. to move to the next form field
• %enter% presses Enter, i.e. the editor action (send, search, next) or a plain Enter key if the field has none

With %tabkey% / %enter%, text parts and key presses are sent one after another with a 150 ms pause after each key press, so the app can move focus first. Cursor placeholders are ignored in that case. Without these placeholders, nothing changes.

Code

• TextExpanderText (new): formatting, parsing, diff – plain Kotlin, covered by TextExpanderTextTest (8 tests)
• TextExpanderTextEditor (new): the editor screen
• TextExpanderScreen: button + the placeholder chip row moved into a reusable composable (no behavior change)
• TextExpanderUtils.expand: %tab%
• InputLogic.commitExpandedText: key press placeholders, the existing path is unchanged when they are not used
• No new settings, no changes to how shortcuts are stored

Tests

• TextExpanderTextTest 8/8, InputLogicTest 125 (1 skipped), SuggestionStripLayoutHelperTest 4/4 – all pass on current main
• Tested on my device with about 40 shortcuts, including several long prompts